The Seattle Mariners have a record of 21-20 on August 21 all-time.

	TEAM	DATE	REC	TM		OPP	RESULT	W%	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Mariners	8/21/1977	0-1	SEA	vs	DET	L 4-5	.000	33	4	7	1	0	1	4	6	0	5	1	1	39	11	2	0	0	0	0	.212	.333	.333	.667
2	Mariners	8/21/1979	1-0	SEA	vs	TOR	W 8-4	1.000	38	8	15	3	1	1	8	5	1	3	1	1	44	23	5	0	0	1	0	.395	.477	.605	1.083
3	Mariners	8/21/1980	1-0	SEA	vs	NYY	W 6-4	1.000	28	6	6	0	1	1	6	5	0	5	1	2	34	11	2	1	0	0	3	.214	.333	.393	.726
4	Mariners	8/21/1981	0-1	SEA	vs	BOS	L 4-7	.000	32	4	7	0	0	0	2	4	0	4	2	0	38	7	0	1	1	0	0	.219	.297	.219	.516
5	Mariners	8/21/1982	0-1	SEA	vs	MIL	L 2-3	.000	33	2	6	3	0	1	2	1	0	6	0	1	34	12	4	0	0	0	0	.182	.206	.364	.570
6	Mariners	8/21/1983	1-0	SEA	@	CLE	W 7-2	1.000	38	7	13	2	0	0	7	3	0	5	0	1	41	15	2	0	0	0	0	.342	.390	.395	.785
7	Mariners	8/21/1984	1-0	SEA	@	BAL	W 4-3	1.000	39	4	13	5	0	0	3	2	0	9	1	0	42	18	5	1	0	0	0	.333	.366	.462	.827
8	Mariners	8/21/1985	0-1	SEA	vs	BAL	L 8-11	.000	35	8	10	2	0	3	8	4	1	9	0	0	40	21	5	0	0	0	2	.286	.375	.600	.975
9	Mariners	8/21/1987	1-0	SEA	vs	BAL	W 3-2	1.000	33	3	11	3	0	2	3	3	0	1	0	0	37	20	5	1	0	0	1	.333	.389	.606	.995
10	Mariners	8/21/1988	1-0	SEA	@	NYY	W 4-2	1.000	33	4	9	4	0	0	3	2	1	5	0	0	37	13	4	1	0	0	3	.273	.333	.394	.727
11	Mariners	8/21/1990	1-0	SEA	@	TEX	W 4-3	1.000	36	4	9	1	0	1	4	8	0	3	3	0	44	13	2	0	0	1	0	.250	.386	.361	.747
12	Mariners	8/21/1991	0-1	SEA	@	MIN	L 1-9	.000	31	1	6	3	0	0	1	3	0	1	0	0	35	9	3	0	1	0	0	.194	.257	.290	.547
13	Mariners	8/21/1992	1-0	SEA	@	BOS	W 5-2	1.000	38	5	12	2	0	0	5	3	0	9	1	0	42	14	2	0	1	0	0	.316	.357	.368	.726
14	Mariners	8/21/1993	1-0	SEA	@	TOR	W 5-2	1.000	31	5	7	3	0	1	5	7	1	6	2	0	41	13	4	1	1	1	1	.226	.375	.419	.794
15	Mariners	8/21/1995	1-0	SEA	vs	BAL	W 6-0	1.000	30	6	10	2	0	1	6	9	2	7	0	1	42	15	3	1	0	1	2	.333	.512	.500	1.012
16	Mariners	8/21/1996	0-1	SEA	@	BAL	L 5-10	.000	35	5	8	1	0	2	5	3	1	9	0	0	39	15	3	0	0	0	0	.229	.308	.429	.736
17	Mariners	8/21/1997	1-0	SEA	vs	CLE	W 7-6	1.000	34	7	8	1	0	1	4	5	0	7	0	0	39	12	2	0	0	3	0	.235	.333	.353	.686
18	Mariners	8/21/1998	1-0	SEA	vs	CWS	W 5-4	1.000	30	5	8	2	0	2	5	5	0	5	0	0	35	16	4	0	0	0	1	.267	.371	.533	.905
19	Mariners	8/21/1999	0-1	SEA	vs	CLE	L 0-6	.000	31	0	6	0	0	0	0	3	0	9	1	0	34	6	0	0	0	0	2	.194	.265	.194	.458
20	Mariners	8/21/2001	1-0	SEA	vs	DET	W 4-1	1.000	32	4	11	2	0	0	4	0	1	4	0	0	34	13	2	1	0	0	0	.344	.364	.406	.770
21	Mariners	8/21/2002	1-0	SEA	@	DET	W 8-2	1.000	39	8	14	1	1	2	8	4	1	9	1	0	45	23	4	0	1	0	0	.359	.422	.590	1.012
22	Mariners	8/21/2003	0-1	SEA	@	TOR	L 3-7	.000	33	3	7	1	0	1	3	4	0	3	0	0	37	11	2	0	0	0	1	.212	.297	.333	.631
23	Mariners	8/21/2004	0-1	SEA	@	DET	L 10-11	.000	52	10	21	3	2	2	10	4	0	9	3	0	57	34	7	0	1	1	0	.404	.439	.654	1.092
24	Mariners	8/21/2005	0-1	SEA	@	MIN	L 3-8	.000	30	3	4	1	0	2	3	3	0	5	0	1	33	11	3	0	0	0	1	.133	.212	.367	.579
25	Mariners	8/21/2007	1-0	SEA	@	MIN	W 7-2	1.000	43	7	18	4	0	2	6	3	1	2	1	0	47	28	6	0	0	0	2	.419	.468	.651	1.119
	Total		21-20					.512	1,422	207	391	74	7	49	194	147	20	262	29	9	1,608	626	130	11	8	10	28	.275	.349	.440	.790