The Seattle Mariners have a record of 26-19 on June 20 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	6/20/1977	1-0	SEA	@	KCR	W 4-2	1.000	30	4	8	2	1	0	4	4	0	6	1	1	36	12	3	1	1	0	0	.267	.343	.400	.743
2	Mariners	6/20/1978	1-0	SEA	@	CWS	W 4-2	1.000	33	4	8	2	0	1	4	3	0	8	0	0	36	13	3	0	0	0	1	.242	.306	.394	.699
3	Mariners	6/20/1979	1-0	SEA	@	CWS	W 5-3	1.000	38	5	14	3	1	1	5	5	0	4	0	0	43	22	5	0	0	1	3	.368	.442	.579	1.021
4	Mariners	6/20/1980	1-0	SEA	@	BAL	W 3-1	1.000	33	3	9	1	0	1	3	3	0	1	0	0	38	13	2	2	0	0	0	.273	.333	.394	.727
5	Mariners	6/20/1982	0-1	SEA	vs	KCR	L 5-7	.000	39	5	12	4	0	1	5	1	0	4	0	0	40	19	5	0	0	0	0	.308	.325	.487	.812
6	Mariners	6/20/1983	0-1	SEA	@	CWS	L 3-7	.000	33	3	6	1	0	0	3	1	0	9	1	0	34	7	1	0	0	0	0	.182	.206	.212	.418
7	Mariners	6/20/1984	0-1	SEA	vs	CWS	L 4-5	.000	37	4	9	3	0	1	3	2	0	7	2	0	39	15	4	0	0	0	0	.243	.282	.405	.687
8	Mariners	6/20/1985	1-0	SEA	@	TEX	W 11-3	1.000	44	11	20	6	0	2	11	4	1	9	0	0	49	32	8	0	0	1	2	.455	.510	.727	1.237
9	Mariners	6/20/1986	1-0	SEA	@	CWS	W 5-3	1.000	34	5	7	3	0	1	5	2	0	9	1	0	37	13	4	0	1	0	0	.206	.243	.382	.626
10	Mariners	6/20/1987	0-1	SEA	@	CLE	L 2-9	.000	34	2	7	4	1	0	2	3	0	7	0	2	37	13	5	0	0	0	0	.206	.270	.382	.653
11	Mariners	6/20/1988	0-1	SEA	@	TEX	L 3-4	.000	30	3	4	0	0	1	3	4	0	4	2	0	34	7	1	0	0	0	1	.133	.235	.233	.469
12	Mariners	6/20/1989	0-1	SEA	vs	BAL	L 6-8	.000	34	6	7	2	1	0	5	2	1	8	0	0	37	11	3	0	0	0	1	.206	.270	.324	.594
13	Mariners	6/20/1990	1-0	SEA	@	KCR	W 3-2	1.000	35	3	9	0	0	1	3	2	0	4	1	0	38	12	1	0	1	1	1	.257	.289	.343	.632
14	Mariners	6/20/1991	0-1	SEA	@	MIL	L 0-4	.000	32	0	4	0	0	0	0	2	0	4	0	0	34	4	0	0	0	0	0	.125	.176	.125	.301
15	Mariners	6/20/1992	0-1	SEA	@	MIN	L 3-5	.000	34	3	12	0	0	3	3	3	0	4	2	0	39	21	3	2	0	0	3	.353	.405	.618	1.023
16	Mariners	6/20/1993	1-0	SEA	vs	TEX	W 13-2	1.000	35	13	12	1	0	3	11	3	1	8	4	1	40	22	4	0	1	0	1	.343	.400	.629	1.029
17	Mariners	6/20/1994	1-0	SEA	@	CAL	W 5-0	1.000	32	5	9	2	0	2	5	9	0	5	1	0	41	17	4	0	0	1	2	.281	.439	.531	.970
18	Mariners	6/20/1995	1-0	SEA	@	CWS	W 9-5	1.000	34	9	9	1	1	2	9	7	0	3	3	0	43	18	4	1	1	1	1	.265	.381	.529	.910
19	Mariners	6/20/1996	1-0	SEA	@	CWS	W 8-5	1.000	38	8	15	4	1	1	8	6	0	4	1	0	45	24	6	1	0	2	2	.395	.477	.632	1.109
20	Mariners	6/20/1997	1-0	SEA	@	TEX	W 5-4	1.000	32	5	7	1	0	1	5	3	1	7	0	0	36	11	2	0	0	0	1	.219	.306	.344	.649
21	Mariners	6/20/1998	0-1	SEA	vs	OAK	L 2-6	.000	35	2	8	1	1	0	2	2	0	7	1	0	37	11	2	0	0	0	0	.229	.270	.314	.585
22	Mariners	6/20/1999	0-1	SEA	@	CLE	L 5-13	.000	38	5	11	3	0	1	5	5	0	7	1	0	43	17	4	0	0	0	0	.289	.372	.447	.819
23	Mariners	6/20/2000	1-0	SEA	vs	TBD	W 4-3	1.000	29	4	5	3	0	0	3	4	0	3	1	1	33	8	3	0	0	0	0	.172	.273	.276	.549
24	Mariners	6/20/2001	0-1	SEA	@	OAK	L 4-6	.000	36	4	9	0	0	3	4	1	0	9	0	0	37	18	3	0	0	0	0	.250	.270	.500	.770
25	Mariners	6/20/2002	1-0	SEA	@	CIN	W 3-2	1.000	38	3	11	2	0	1	2	0	2	7	0	0	40	16	3	0	0	0	0	.289	.325	.421	.746
	Total		26-19					.578	1,559	236	426	93	7	55	223	151	14	308	32	8	1,746	698	155	11	11	11	44	.273	.341	.448	.788