WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 08/25/2003

Class	Cusip	Orig Prin Bal	Begin Prin Bal	Int Rate Accrued	Int Rate Paid	Int Dist	Prin Dist	Int Shortfall	Prin Loss	Deferred Interest	Int Reimbursed	Unscheduled Int	Prin Reimbursed	Total Dist	Ending Class Bal
IA1	939335KP9	$80,000,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA2	939335KQ7	$34,786,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA3	939335KR5	$7,590,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA4	939335KS3	$22,587,171.00	$13,754,008.58	6.7500000000%	6.7500000000%	$77,366.30	$1,779,537.99	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,856,904.28	$11,974,470.59
IA5	939335KT1	$3,750,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA6	939335KU8	$3,490,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA7	939335KV6	$4,533,000.00	$0.13	7.0000000000%	7.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.13
IA8	939335KW4	$717,149.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA9	939335KX2	$70,000,000.00	$0.02	6.5000000000%	6.5000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.02
IA10	939335KY0	$2,592,592.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA11	939335KZ7	$176,000.00	$107,171.70	6.7500000000%	6.7500000000%	$602.84	$13,866.22	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$14,469.06	$93,305.48
IIA1	939335LA1	$49,602,806.00	$6,148,157.83	6.5000000000%	6.5000000000%	$33,302.52	$1,799,310.21	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,832,612.73	$4,348,847.62
IIA2	939335LB9	$100,000,000.00	$12,394,778.29	6.5000000000%	6.5000000000%	$67,138.38	$3,627,436.34	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$3,694,574.72	$8,767,341.95
IIA3	939335LC7	$920,000.00	$114,031.96	6.5000000000%	6.5000000000%	$617.67	$33,372.41	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$33,990.09	$80,659.55
IIIA1	939335LD5	$354,937,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA2	939335LE3	$31,650,000.00	$0.02	6.7500000000%	6.7500000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.02
IIIA3	939335LF0	$15,329,000.00	$1,146,031.26	6.7500000000%	6.7500000000%	$6,446.43	$1,146,031.26	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,152,477.69	$0.00
IIIA4	939335LG8	$54,500,070.00	$54,500,070.00	6.7500000000%	6.7500000000%	$306,562.89	$12,923,616.51	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$13,230,179.40	$41,576,453.49
IIIA5	939335LH6	$50,000,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA6	939335LJ2	$500,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA7	939335LK9	$500,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA8	939335LL7	$500,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA9	939335LM5	$500,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA10	939335LN3	$500,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA11	939335LP8	$500,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA12	939335LQ6	$500,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA13	939335LR4	$500,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA14	939335LS2	$500,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA15	939335LT0	$500,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA16	939335LU7	$550,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA17	939335LV5	$3,910,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 08/25/2003

Class	Cusip	Orig Prin Bal	Begin Prin Bal	Int Rate Accrued	Int Rate Paid	Int Dist	Prin Dist	Int Shortfall	Prin Loss	Deferred Interest	Int Reimbursed	Unscheduled Int	Prin Reimbursed	Total Dist	Ending Class Bal
IIIA18	939335LW3	$1,536,261.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA19	939335LX1	$25,000,000.00	$602,387.60	6.6000000000%	6.6000000000%	$3,313.13	$602,387.60	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$605,700.73	$0.00
IIIA20	939335LY9	$550,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA21	939335LZ6	$500,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA22	939335MA0	$400,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA23	939335MB8	$400,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA24	939335MC6	$400,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA25	939335MD4	$400,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA26	939335ME2	$400,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA27	939335MF9	$400,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA28	939335MG7	$5,000,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA29	939335MH5	$407,407.00	$9,816.69	6.7500000000%	6.7500000000%	$55.22	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$55.22	$0.00
IIIA30	939335MJ1	$2,657,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA31	939335MK8	$4,449,000.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA32	939335ML6	$510,000.00	$510,000.00	6.7500000000%	6.7500000000%	$2,868.75	$120,936.44	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$123,805.19	$389,063.56
AX	939335MM4	$11,360,932.00	$766,509.24	6.7500000000%	6.7499999954%	$4,311.61	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$4,311.61	$595,473.44
IIX	939335MN2	$1,907,006.00	$299,248.34	6.5000000000%	6.5000000000%	$1,620.93	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$1,620.93	$231,558.05
AP	939335MP7	$1,573,054.00	$360,710.63	0.0000000000%	0.0000000000%	$0.00	$69,037.86	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$69,037.86	$291,672.77
IIP	939335MQ5	$896,483.00	$284,010.04	0.0000000000%	0.0000000000%	$0.00	$45,430.02	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$45,430.02	$238,580.02
CB1	939335MR3	$16,986,305.00	$16,298,986.78	6.7113233119%	6.7113233119%	$91,156.47	$23,778.50	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$114,934.98	$16,275,208.28
CB2	939335MS1	$4,853,231.00	$4,656,854.29	6.7113233119%	6.7113233119%	$26,044.71	$6,793.86	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$32,838.57	$4,650,060.43
CB3	939335MT9	$3,882,583.00	$3,725,481.73	6.7113233119%	6.7113233119%	$20,835.76	$5,435.09	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$26,270.85	$3,720,046.64
CB4	939335NK7	$2,426,615.00	$2,328,426.71	6.7113233119%	6.7113233119%	$13,022.35	$3,396.93	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$16,419.28	$2,325,029.78
CB5	939335NM3	$1,455,970.00	$1,397,056.96	6.7113233119%	6.7113233119%	$7,813.42	$2,038.16	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$9,851.58	$1,395,018.80
CB6	939335NP6	$1,941,293.00	$1,634,169.69	6.7113233119%	6.7113233119%	$9,139.53	$2,384.09	$0.00	$0.00	$0.00	$0.00	$0.00	$0.01	$11,523.62	$1,631,785.61
R1	939335MU6	$50.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
R2	939335MV4	$50.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
R3	939335MW2	$50.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
MBIA	XXXXXXXXX	$0.00	$0.00	0.0000000000%	0.0000000000%	$20.08	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$20.08	$0.00
R_SYN	XXXXXXXXX	$0.00	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA19_ROUND	XXXXXXXXX	$25,000,000.00	$602,000.00	6.6000000000%	6.6000000000%	$3,311.00	$602,000.00	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00	$605,311.00	$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.

Series: WMMSC.018

Distribution Date: 08/25/2003

Class

Cusip

Orig Prin Bal

Begin Prin Bal

Int Rate Accrued

Int Rate Paid

Int Dist

Prin Dist

Int Shortfall

Prin Loss

Deferred Interest

Int Reimbursed

Unscheduled Int

Prin Reimbursed

Total Dist

Ending Class Bal

Total

$970,646,141.00

$119,962,334.22

$672,239.01

$22,204,789.48

$0.00

$0.01

$22,877,028.49

$97,757,544.75

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 08/25/2003

Class	Orig Face	Beg Bal	Prin Loss	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
IA1	$80,000,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IA2	$34,786,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IA3	$7,590,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IA4	$22,587,171.00	$13,754,008.58	$0.00	$0.00	$1,779,537.99	0.5301447707	$11,974,470.59
IA5	$3,750,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IA6	$3,490,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IA7	$4,533,000.00	$0.13	$0.00	$0.00	$0.00	0.0000000287	$0.13
IA8	$717,149.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IA9	$70,000,000.00	$0.02	$0.00	$0.00	$0.00	0.0000000003	$0.02
IA10	$2,592,592.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IA11	$176,000.00	$107,171.70	$0.00	$0.00	$13,866.22	0.5301447727	$93,305.48
IIA1	$49,602,806.00	$6,148,157.83	$0.00	$0.00	$1,799,310.21	0.0876734195	$4,348,847.62
IIA2	$100,000,000.00	$12,394,778.29	$0.00	$0.00	$3,627,436.34	0.0876734195	$8,767,341.95
IIA3	$920,000.00	$114,031.96	$0.00	$0.00	$33,372.41	0.0876734239	$80,659.55
IIIA1	$354,937,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA2	$31,650,000.00	$0.02	$0.00	$0.00	$0.00	0.0000000006	$0.02
IIIA3	$15,329,000.00	$1,146,031.26	$0.00	$0.00	$1,146,031.26	0.0000000000	$0.00
IIIA4	$54,500,070.00	$54,500,070.00	$0.00	$0.00	$12,923,616.51	0.7628697264	$41,576,453.49
IIIA5	$50,000,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA6	$500,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA7	$500,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA8	$500,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA9	$500,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA10	$500,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA11	$500,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA12	$500,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA13	$500,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA14	$500,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA15	$500,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA16	$550,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA17	$3,910,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 08/25/2003

Class	Orig Face	Beg Bal	Prin Loss	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
IIIA18	$1,536,261.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA19	$25,000,000.00	$602,387.60	$0.00	$0.00	$602,387.60	0.0000000000	$0.00
IIIA20	$550,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA21	$500,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA22	$400,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA23	$400,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA24	$400,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA25	$400,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA26	$400,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA27	$400,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA28	$5,000,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA29	$407,407.00	$9,816.69	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA30	$2,657,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA31	$4,449,000.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA32	$510,000.00	$510,000.00	$0.00	$0.00	$120,936.44	0.7628697255	$389,063.56
AX	$11,360,932.00	$766,509.24	$0.00	$0.00	$0.00	0.0524141364	$595,473.44
IIX	$1,907,006.00	$299,248.34	$0.00	$0.00	$0.00	0.1214249195	$231,558.05
AP	$1,573,054.00	$360,710.63	$0.00	$0.00	$69,037.86	0.1854181547	$291,672.77
IIP	$896,483.00	$284,010.04	$0.00	$0.00	$45,430.02	0.2661288836	$238,580.02
CB1	$16,986,305.00	$16,298,986.78	$0.00	$0.00	$23,778.50	0.9581370569	$16,275,208.28
CB2	$4,853,231.00	$4,656,854.29	$0.00	$0.00	$6,793.86	0.9581370493	$4,650,060.43
CB3	$3,882,583.00	$3,725,481.73	$0.00	$0.00	$5,435.09	0.9581370546	$3,720,046.64
CB4	$2,426,615.00	$2,328,426.71	$0.00	$0.00	$3,396.93	0.9581370675	$2,325,029.78
CB5	$1,455,970.00	$1,397,056.96	$0.00	$0.00	$2,038.16	0.9581370495	$1,395,018.80
CB6	$1,941,293.00	$1,634,169.69	$0.00	$0.00	$2,384.09	0.8405663699	$1,631,785.61
R1	$50.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
R2	$50.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
R3	$50.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
MBIA	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
R_SYN	$0.00	$0.00	$0.00	$0.00	$0.00	0.0000000000	$0.00
IIIA19_ROUND	$25,000,000.00	$602,000.00	$0.00	$0.00	$602,000.00	0.0000000000	$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 08/25/2003

Class	Orig Face	Beg Bal	Prin Loss	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
Total	$970,646,141.00	$119,962,334.22	$0.00	$0.00	$22,204,789.48	0.1007138860	$97,757,544.75

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 08/25/2003
PER $1000 DENOMINATION
Class	Orig Face	Beg Bal	Prin Loss	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
IA1	$80,000,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IA2	$34,786,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IA3	$7,590,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IA4	$22,587,171.00	608.93011258	0.00000000	0.00000000	78.78534191	0.5301447707	530.14477068
IA5	$3,750,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IA6	$3,490,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IA7	$4,533,000.00	0.00002868	0.00000000	0.00000000	0.00000000	0.0000000287	0.00002868
IA8	$717,149.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IA9	$70,000,000.00	0.00000029	0.00000000	0.00000000	0.00000000	0.0000000003	0.00000029
IA10	$2,592,592.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IA11	$176,000.00	608.93011364	0.00000000	0.00000000	78.78534091	0.5301447727	530.14477273
IIA1	$49,602,806.00	123.94778291	0.00000000	0.00000000	36.27436339	0.0876734195	87.67341952
IIA2	$100,000,000.00	123.94778290	0.00000000	0.00000000	36.27436340	0.0876734195	87.67341950
IIA3	$920,000.00	123.94778261	0.00000000	0.00000000	36.27435870	0.0876734239	87.67342391
IIIA1	$354,937,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA2	$31,650,000.00	0.00000063	0.00000000	0.00000000	0.00000000	0.0000000006	0.00000063
IIIA3	$15,329,000.00	74.76229761	0.00000000	0.00000000	74.76229761	0.0000000000	0.00000000
IIIA4	$54,500,070.00	1,000.00000000	0.00000000	0.00000000	237.13027359	0.7628697264	762.86972641
IIIA5	$50,000,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA6	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA7	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA8	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA9	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA10	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA11	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA12	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA13	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA14	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA15	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA16	$550,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA17	$3,910,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 08/25/2003
PER $1000 DENOMINATION
Class	Orig Face	Beg Bal	Prin Loss	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal
IIIA18	$1,536,261.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA19	$25,000,000.00	24.09550400	0.00000000	0.00000000	24.09550400	0.0000000000	0.00000000
IIIA20	$550,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA21	$500,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA22	$400,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA23	$400,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA24	$400,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA25	$400,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA26	$400,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA27	$400,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA28	$5,000,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA29	$407,407.00	24.09553591	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA30	$2,657,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA31	$4,449,000.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA32	$510,000.00	1,000.00000000	0.00000000	0.00000000	237.13027451	0.7628697255	762.86972549
AX	$11,360,932.00	67.46886963	0.00000000	0.00000000	0.00000000	0.0524141364	52.41413645
IIX	$1,907,006.00	156.92050261	0.00000000	0.00000000	0.00000000	0.1214249195	121.42491948
AP	$1,573,054.00	229.30594245	0.00000000	0.00000000	43.88778770	0.1854181547	185.41815475
IIP	$896,483.00	316.80471353	0.00000000	0.00000000	50.67582988	0.2661288836	266.12888365
CB1	$16,986,305.00	959.53691989	0.00000000	0.00000000	1.39986301	0.9581370569	958.13705688
CB2	$4,853,231.00	959.53691263	0.00000000	0.00000000	1.39986331	0.9581370493	958.13704932
CB3	$3,882,583.00	959.53691911	0.00000000	0.00000000	1.39986447	0.9581370546	958.13705464
CB4	$2,426,615.00	959.53693107	0.00000000	0.00000000	1.39986360	0.9581370675	958.13706748
CB5	$1,455,970.00	959.53691354	0.00000000	0.00000000	1.39986401	0.9581370495	958.13704953
CB6	$1,941,293.00	841.79445864	0.00000000	0.00000000	1.22809385	0.8405663699	840.56636994
R1	$50.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
R2	$50.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
R3	$50.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
MBIA	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
R_SYN	$0.00	0.00000000	0.00000000	0.00000000	0.00000000	0.0000000000	0.00000000
IIIA19_ROUND	$25,000,000.00	24.08000000	0.00000000	0.00000000	24.08000000	0.0000000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 08/25/2003
PER $1000 DENOMINATION
Class	Orig Face	Beg Bal	Prin Loss	Deferred Interest	Total Prin	End Cert Pct	End Cert Bal

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 08/25/2003

Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Curent Int Accrued	Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
IA1	$80,000,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA2	$34,786,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA3	$7,590,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA4	$22,587,171.00	6.7500000000%	6.7500000000%	$13,754,008.58	$77,366.30	$0.00	$0.00	$0.00	$77,366.30
IA5	$3,750,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA6	$3,490,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA7	$4,533,000.00	7.0000000000%	7.0000000000%	$0.13	$0.00	$0.00	$0.00	$0.00	$0.00
IA8	$717,149.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA9	$70,000,000.00	6.5000000000%	6.5000000000%	$0.02	$0.00	$0.00	$0.00	$0.00	$0.00
IA10	$2,592,592.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IA11	$176,000.00	6.7500000000%	6.7500000000%	$107,171.70	$602.84	$0.00	$0.00	$0.00	$602.84
IIA1	$49,602,806.00	6.5000000000%	6.5000000000%	$6,148,157.83	$33,302.52	$0.00	$0.00	$0.00	$33,302.52
IIA2	$100,000,000.00	6.5000000000%	6.5000000000%	$12,394,778.29	$67,138.38	$0.00	$0.00	$0.00	$67,138.38
IIA3	$920,000.00	6.5000000000%	6.5000000000%	$114,031.96	$617.67	$0.00	$0.00	$0.00	$617.67
IIIA1	$354,937,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA2	$31,650,000.00	6.7500000000%	6.7500000000%	$0.02	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA3	$15,329,000.00	6.7500000000%	6.7500000000%	$1,146,031.26	$6,446.43	$0.00	$0.00	$0.00	$6,446.43
IIIA4	$54,500,070.00	6.7500000000%	6.7500000000%	$54,500,070.00	$306,562.89	$0.00	$0.00	$0.00	$306,562.89
IIIA5	$50,000,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA6	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA7	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA8	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA9	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA10	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA11	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA12	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA13	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA14	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA15	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA16	$550,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA17	$3,910,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 08/25/2003

Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Curent Int Accrued	Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
IIIA18	$1,536,261.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA19	$25,000,000.00	6.6000000000%	6.6000000000%	$602,387.60	$3,313.13	$0.00	$0.00	$0.00	$3,313.13
IIIA20	$550,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA21	$500,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA22	$400,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA23	$400,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA24	$400,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA25	$400,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA26	$400,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA27	$400,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA28	$5,000,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA29	$407,407.00	6.7500000000%	6.7500000000%	$9,816.69	$55.22	$0.00	$0.00	$0.00	$55.22
IIIA30	$2,657,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA31	$4,449,000.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA32	$510,000.00	6.7500000000%	6.7500000000%	$510,000.00	$2,868.75	$0.00	$0.00	$0.00	$2,868.75
AX	$11,360,932.00	6.7500000000%	6.7499999954%	$766,509.24	$4,311.61	$0.00	$0.00	$0.00	$4,311.61
IIX	$1,907,006.00	6.5000000000%	6.5000000000%	$299,248.34	$1,620.93	$0.00	$0.00	$0.00	$1,620.93
AP	$1,573,054.00	0.0000000000%	0.0000000000%	$360,710.63	$0.00	$0.00	$0.00	$0.00	$0.00
IIP	$896,483.00	0.0000000000%	0.0000000000%	$284,010.04	$0.00	$0.00	$0.00	$0.00	$0.00
CB1	$16,986,305.00	6.7113233119%	6.7113233119%	$16,298,986.78	$91,156.47	$0.00	$0.00	$0.00	$91,156.47
CB2	$4,853,231.00	6.7113233119%	6.7113233119%	$4,656,854.29	$26,044.71	$0.00	$0.00	$0.00	$26,044.71
CB3	$3,882,583.00	6.7113233119%	6.7113233119%	$3,725,481.73	$20,835.76	$0.00	$0.00	$0.00	$20,835.76
CB4	$2,426,615.00	6.7113233119%	6.7113233119%	$2,328,426.71	$13,022.35	$0.00	$0.00	$0.00	$13,022.35
CB5	$1,455,970.00	6.7113233119%	6.7113233119%	$1,397,056.96	$7,813.42	$0.00	$0.00	$0.00	$7,813.42
CB6	$1,941,293.00	6.7113233119%	6.7113233119%	$1,634,169.69	$9,139.53	$0.00	$0.00	$0.00	$9,139.53
R1	$50.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
R2	$50.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
R3	$50.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
MBIA	$0.00	0.0000000000%	0.0000000000%	$0.00	$20.08	$0.00	$0.00	$0.00	$20.08
R_SYN	$0.00	0.0000000000%	0.0000000000%	$0.00	$0.00	$0.00	$0.00	$0.00	$0.00
IIIA19_ROUND	$25,000,000.00	6.6000000000%	6.6000000000%	$602,000.00	$3,311.00	$0.00	$0.00	$0.00	$3,311.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 08/25/2003

Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Curent Int Accrued	Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
Total	$970,646,141.00			$119,962,334.22	$672,239.01	$0.00	$0.00	$0.00	$672,239.01

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 08/25/2003
PER $1000 DENOMINATION
Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Curent Int Accrued	Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
IA1	$80,000,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA2	$34,786,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA3	$7,590,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA4	$22,587,171.00	6.7500000000%	6.7500000000%	608.93011258	3.42523196	0.00000000	0.00000000	0.00000000	3.42523196
IA5	$3,750,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA6	$3,490,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA7	$4,533,000.00	7.0000000000%	7.0000000000%	0.00002868	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA8	$717,149.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA9	$70,000,000.00	6.5000000000%	6.5000000000%	0.00000029	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA10	$2,592,592.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IA11	$176,000.00	6.7500000000%	6.7500000000%	608.93011364	3.42522727	0.00000000	0.00000000	0.00000000	3.42522727
IIA1	$49,602,806.00	6.5000000000%	6.5000000000%	123.94778291	0.67138379	0.00000000	0.00000000	0.00000000	0.67138379
IIA2	$100,000,000.00	6.5000000000%	6.5000000000%	123.94778290	0.67138380	0.00000000	0.00000000	0.00000000	0.67138380
IIA3	$920,000.00	6.5000000000%	6.5000000000%	123.94778261	0.67138043	0.00000000	0.00000000	0.00000000	0.67138043
IIIA1	$354,937,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA2	$31,650,000.00	6.7500000000%	6.7500000000%	0.00000063	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA3	$15,329,000.00	6.7500000000%	6.7500000000%	74.76229761	0.42053820	0.00000000	0.00000000	0.00000000	0.42053820
IIIA4	$54,500,070.00	6.7500000000%	6.7500000000%	1,000.00000000	5.62499993	0.00000000	0.00000000	0.00000000	5.62499993
IIIA5	$50,000,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA6	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA7	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA8	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA9	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA10	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA11	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA12	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA13	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA14	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA15	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA16	$550,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA17	$3,910,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 08/25/2003
PER $1000 DENOMINATION
Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Curent Int Accrued	Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist
IIIA18	$1,536,261.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA19	$25,000,000.00	6.6000000000%	6.6000000000%	24.09550400	0.13252520	0.00000000	0.00000000	0.00000000	0.13252520
IIIA20	$550,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA21	$500,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA22	$400,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA23	$400,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA24	$400,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA25	$400,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA26	$400,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA27	$400,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA28	$5,000,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA29	$407,407.00	6.7500000000%	6.7500000000%	24.09553591	0.13554014	0.00000000	0.00000000	0.00000000	0.13554014
IIIA30	$2,657,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA31	$4,449,000.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA32	$510,000.00	6.7500000000%	6.7500000000%	1,000.00000000	5.62500000	0.00000000	0.00000000	0.00000000	5.62500000
AX	$11,360,932.00	6.7500000000%	6.7499999954%	67.46886963	0.37951200	0.00000000	0.00000000	0.00000000	0.37951200
IIX	$1,907,006.00	6.5000000000%	6.5000000000%	156.92050261	0.84998684	0.00000000	0.00000000	0.00000000	0.84998684
AP	$1,573,054.00	0.0000000000%	0.0000000000%	229.30594245	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIP	$896,483.00	0.0000000000%	0.0000000000%	316.80471353	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
CB1	$16,986,305.00	6.7113233119%	6.7113233119%	959.53691989	5.36646846	0.00000000	0.00000000	0.00000000	5.36646846
CB2	$4,853,231.00	6.7113233119%	6.7113233119%	959.53691263	5.36646824	0.00000000	0.00000000	0.00000000	5.36646824
CB3	$3,882,583.00	6.7113233119%	6.7113233119%	959.53691911	5.36646866	0.00000000	0.00000000	0.00000000	5.36646866
CB4	$2,426,615.00	6.7113233119%	6.7113233119%	959.53693107	5.36646728	0.00000000	0.00000000	0.00000000	5.36646728
CB5	$1,455,970.00	6.7113233119%	6.7113233119%	959.53691354	5.36647046	0.00000000	0.00000000	0.00000000	5.36647046
CB6	$1,941,293.00	6.7113233119%	6.7113233119%	841.79445864	4.70796011	0.00000000	0.00000000	0.00000000	4.70796011
R1	$50.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
R2	$50.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
R3	$50.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
MBIA	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
R_SYN	$0.00	0.0000000000%	0.0000000000%	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000	0.00000000
IIIA19_ROUND	$25,000,000.00	6.6000000000%	6.6000000000%	24.08000000	0.13244000	0.00000000	0.00000000	0.00000000	0.13244000

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 08/25/2003
PER $1000 DENOMINATION
Class	Orig Face	Int Rate Accrued	Int Rate Paid	Beg Cert Prin/Not Bal	Curent Int Accrued	Int Shortfall	Unscheduled Int	Int Reimbursed	Total Int Dist

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
SERIES: WMMSC 018 WEIGHTED AVERAGE PC RATE: 6.72450%
POOL NUMBER: Group 1(1750,1751,1752)
ISSUE DATE: 07/31/2001
CERTIFICATE BALANCE AT ISSUE: $970,646,141.00
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	306		$119,962,334.23
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$191,111.14
Unscheduled Principal Collection/Reversals		$166,503.79
Liquidations-in-full	57	$21,847,174.54
Net principal Distributed		$22,204,789.47	-$22,204,789.47

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	249		$97,757,544.76

SCHEDULED INTEREST AT MORTGAGE RATE:		$726,453.29

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$54,214.27

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$22,877,028.49

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
SERIES: WMMSC 018 WEIGHTED AVERAGE PC RATE: 6.82255%
POOL NUMBER: 1750
ISSUE DATE: 07/31/2001
CERTIFICATE BALANCE AT ISSUE: $235,379,218.00
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	53		$20,967,401.90
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$20,526.24
Unscheduled Principal Collection/Reversals		$1,721.06
Liquidations-in-full	5	$1,778,128.99
Net principal Distributed		$1,800,376.29	-$1,800,376.29

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	48		$19,167,025.61

SCHEDULED INTEREST AT MORTGAGE RATE:		$131,773.55

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$12,564.33

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$1,919,585.51

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
SERIES: WMMSC 018 WEIGHTED AVERAGE PC RATE: 6.50420%
POOL NUMBER: 1751
ISSUE DATE: 07/31/2001
CERTIFICATE BALANCE AT ISSUE: $156,505,726.00
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	60		$23,588,519.99
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$98,258.88
Unscheduled Principal Collection/Reversals		$162,282.56
Liquidations-in-full	13	$5,264,348.19
Net principal Distributed		$5,524,889.63	-$5,524,889.63

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	47		$18,063,630.36

SCHEDULED INTEREST AT MORTGAGE RATE:		$137,744.25

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$9,890.56

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$5,652,743.32

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
SERIES: WMMSC 018 WEIGHTED AVERAGE PC RATE: 6.76615%
POOL NUMBER: 1752
ISSUE DATE: 07/31/2001
CERTIFICATE BALANCE AT ISSUE: $578,761,197.00
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	193		$75,406,412.34
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$72,326.02
Unscheduled Principal Collection/Reversals		$2,500.17
Liquidations-in-full	39	$14,804,697.36
Net principal Distributed		$14,879,523.55	-$14,879,523.55

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	154		$60,526,888.79

SCHEDULED INTEREST AT MORTGAGE RATE:		$456,935.49

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$31,759.38

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$15,304,699.66

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
SERIES: WMMSC 018 WEIGHTED AVERAGE PC RATE: 6.72450%
POOL NUMBER: ALL
ISSUE DATE: 07/31/2001
CERTIFICATE BALANCE AT ISSUE: $970,646,141.00
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END:	306		$119,962,334.23
PRINCIPAL POOL COLLECTION(S):
Scheduled Principal Collection Due Current Month		$191,111.14
Unscheduled Principal Collection/Reversals		$166,503.79
Liquidations-in-full	57	$21,847,174.54
Net principal Distributed		$22,204,789.47	-$22,204,789.47

CAPITAL LOSS (PRINCIPAL WRITTEN OFF):			$0.00

BALANCE CURRENT FISCAL MONTH-END:	249		$97,757,544.76

SCHEDULED INTEREST AT MORTGAGE RATE:		$726,453.29

UNSCHEDULED INTEREST AT MORTGAGE RATE:
Unscheduled Interest Collection/Reversals		$0.00
Interest Uncollected on Liquidation		$0.00
Interest Uncollected on Non-Earning Assets		$0.00
Net Unscheduled Interest Distributed		$0.00

OTHER:
Loan Conversion Fees		$0.00
Expense Reimbursements		$0.00
Gain on Liquidations		$0.00
Hazard Insurance Premium Refunds		$0.00
Net Other Distributions		$0.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2003 DISTRIBUTION REPORT
	TOTAL NUMBER OF MORTAGES	CERTIFICATE ACCOUNT ACTIVITY (@ PCRATE)	CERTIFICATE BALANCE OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:		$54,214.27

UNSCHEDULED SERVICING FEES:
Unscheduled Service Fee Collections/Reversals		$0.00
Servicing Fees Uncollected on Liquidation		$0.00
Servicing Fees Uncollected/Non-Earning Assets		$0.00
Net Unscheduled Service Fees Distributed		$0.00

MISCELLANEOUS EXPENSES:		$0.00

NET FUNDS DISTRIBUTED:		$22,877,028.49

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 08/25/2003

Distribution by Group
Pool ID		Principal		Interest		Total
Group 1(1750,1751,1752)		$22,204,789.47		$672,239.02		$22,877,028.49
Pool - 1750		$1,800,376.29		$119,209.22		$1,919,585.51
Pool - 1751		$5,524,889.63		$127,853.69		$5,652,743.32
Pool - 1752		$14,879,523.55		$425,176.11		$15,304,699.66
Aggregate		$22,204,789.47		$672,239.02		$22,877,028.49

Number of Loans and Aggregate Principal Balance By Group
Pool ID	Beg Bal	Beg Count	Paid Off / Liq Count	Rem Count	Sched Prin End Bal	Sched Prin	Prin PrePay / Liq	Unsched Prin / Rev	Total Prin
Group 1(1750,1751,1752)	$119,962,334.23	306	57	249	$97,757,544.76	$191,111.14	$21,847,174.54	$166,503.79	$22,204,789.47
Pool - 1750	$20,967,401.90	53	5	48	$19,167,025.61	$20,526.24	$1,778,128.99	$1,721.06	$1,800,376.29
Pool - 1751	$23,588,519.99	60	13	47	$18,063,630.36	$98,258.88	$5,264,348.19	$162,282.56	$5,524,889.63
Pool - 1752	$75,406,412.34	193	39	154	$60,526,888.79	$72,326.02	$14,804,697.36	$2,500.17	$14,879,523.55
Aggregate	$119,962,334.23	306	57	249	$97,757,544.76	$191,111.14	$21,847,174.54	$166,503.79	$22,204,789.47

Delinquency Information by Group
Pool ID	1 Month Count	Sched End Balance	2 Months Count	Sched End Balance	3 Months Count	Sched End Balance	4 Months Count	Sched End Balance
Group 1(1750,1751,1752)	4	$1,417,947.33	2	$603,958.93	0	$0.00	2	$657,250.84
Pool - 1750	1	$337,392.81	1	$313,187.13	0	$0.00	0	$0.00
Pool - 1751	2	$660,466.71	0	$0.00	0	$0.00	0	$0.00
Pool - 1752	1	$420,087.81	1	$290,771.80	0	$0.00	2	$657,250.84
Aggregate	4	$1,417,947.33	2	$603,958.93	0	$0.00	2	$657,250.84

Foreclosure and REO Information by Group
Pool ID		Foreclosure Count		Sched End Balance		REO Count		Sched End Balance
Group 1(1750,1751,1752)		2		$933,129.32		1		$661,755.67
Pool - 1750		1		$455,644.93		0		$0.00
Pool - 1751		0		$0.00		1		$661,755.67
Pool - 1752		1		$477,484.39		0		$0.00
Aggregate		2		$933,129.32		1		$661,755.67

Aggregate Loss Amounts by Group
Pool ID			Count			Loss Amount
Group 1(1750,1751,1752)			2			$229,993.40
Aggregate			2			$229,993.40

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 08/25/2003

INSURANCE RESERVES - Group 1(1750,1751,1752)
Insurance Type	Original Balance	Claims In Progress	Claims Paid	Coverage Adjustments	Coverage Remaining
MPI	$0.00	$0.00	$0.00	$0.00	$0.00
Special Hazard	$9,706,461.00	$0.00	$0.00	$0.00	$9,706,461.00
Bankruptcy Bond
Single-Units	$263,721.00	$0.00	$0.00	$0.00	$263,721.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$9,706,461.00	$0.00	$0.00	$0.00	$9,706,461.00

INSURANCE RESERVES - Aggregate
Insurance Type	Original Balance	Claims In Progress	Claims Paid	Coverage Adjustments	Coverage Remaining
MPI	$0.00	$0.00	$0.00	$0.00	$0.00
Special Hazard	$9,706,461.00	$0.00	$0.00	$0.00	$9,706,461.00
Bankruptcy Bond
Single-Units	$263,721.00	$0.00	$0.00	$0.00	$263,721.00
Multi-Units	$0.00	$0.00	$0.00	$0.00	$0.00
Mortgage Repurchase	$9,706,461.00	$0.00	$0.00	$0.00	$9,706,461.00

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: WMMSC.018
Distribution Date: 08/25/2003

The Class Principal Balances of each Class of the Class CB1,CB2,CB3,CB4,CB5,CB6 Certificatesimmediately after the principal and interest distribution on 200308 are as follows:

Class			Class Principal Balance
CB1			$16,275,208.28
CB2			$4,650,060.43
CB3			$3,720,046.64
CB4			$2,325,029.78
CB5			$1,395,018.80
CB6			$1,631,785.61
Total			$29,997,149.54
Capitalized items used but not defined herein have the meanings ascribed to them in the Prospectus Supplement.

WASHINGTON MUTUAL MOR SEC CORP MOR PASS THRU CERT SER 2001-8 8-K