The Seattle Mariners have a 12-30 record on May 1 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	5/1/1977	0-1	SEA	@	NYY	L 2-5	.000	35	2	13	2	0	0	2	3	0	1	0	1	38	15	2	0	0	0	4	.371	.421	.429	.850
2	Mariners	5/1/1979	0-1	SEA	vs	BAL	L 1-3	.000	32	1	6	0	1	0	1	1	0	5	3	0	34	8	1	1	0	0	0	.188	.212	.250	.462
3	Mariners	5/1/1980	0-1	SEA	@	CAL	L 1-2	.000	33	1	8	3	0	0	1	1	0	3	0	0	36	11	3	2	0	1	0	.242	.265	.333	.598
4	Mariners	5/1/1981	0-1	SEA	vs	DET	L 3-7	.000	33	3	7	0	0	1	3	1	0	4	0	1	34	10	1	0	0	0	1	.212	.235	.303	.538
5	Mariners	5/1/1982	0-1	SEA	@	NYY	L 1-5	.000	31	1	6	1	1	0	1	5	0	6	2	1	36	9	2	0	0	0	2	.194	.306	.290	.596
6	Mariners	5/1/1983	0-1	SEA	vs	BAL	L 2-8	.000	31	2	6	3	0	1	2	3	0	4	0	0	34	12	4	0	0	0	2	.194	.265	.387	.652
7	Mariners	5/1/1984	1-0	SEA	vs	MIN	W 11-8	1.000	39	11	18	3	1	1	11	6	0	2	0	1	46	26	5	0	1	1	2	.462	.522	.667	1.188
8	Mariners	5/1/1985	1-0	SEA	vs	BOS	W 7-0	1.000	32	7	8	5	0	1	7	4	0	9	2	0	36	16	6	0	0	0	0	.250	.333	.500	.833
9	Mariners	5/1/1986	0-1	SEA	@	BOS	L 2-12	.000	34	2	9	0	0	1	2	1	0	5	0	0	35	12	1	0	0	0	2	.265	.286	.353	.639
10	Mariners	5/1/1987	0-1	SEA	vs	MIL	L 8-10	.000	41	8	15	2	0	2	6	4	0	7	1	1	45	23	4	0	0	0	0	.366	.422	.561	.983
11	Mariners	5/1/1988	0-1	SEA	@	DET	L 2-3	.000	35	2	7	1	0	0	2	1	0	13	0	0	36	8	1	0	0	0	0	.200	.222	.229	.451
12	Mariners	5/1/1989	1-0	SEA	vs	DET	W 5-3	1.000	33	5	11	3	0	0	4	0	0	7	2	1	35	14	3	1	1	0	0	.333	.324	.424	.748
13	Mariners	5/1/1990	0-1	SEA	@	BOS	L 2-8	.000	33	2	6	3	0	0	2	0	1	8	0	0	34	9	3	0	0	0	0	.182	.206	.273	.479
14	Mariners	5/1/1991	0-1	SEA	@	BAL	L 1-2	.000	31	1	7	3	0	0	1	7	0	4	0	0	38	10	3	0	0	0	2	.226	.368	.323	.691
15	Mariners	5/1/1992	0-1	SEA	@	BAL	L 1-15	.000	31	1	5	2	0	1	1	0	1	5	0	0	32	10	3	0	0	0	1	.161	.188	.323	.510
16	Mariners	5/1/1993	0-1	SEA	@	NYY	L 2-6	.000	30	2	4	0	0	2	2	3	2	4	2	1	35	10	2	0	0	0	0	.133	.257	.333	.590
17	Mariners	5/1/1994	1-0	SEA	vs	BAL	W 6-0	1.000	34	6	12	1	1	1	6	6	3	8	1	0	44	18	3	0	1	2	0	.353	.477	.529	1.007
18	Mariners	5/1/1995	1-0	SEA	@	TEX	W 4-1	1.000	36	4	8	0	0	0	4	3	0	9	0	0	39	8	0	0	0	0	0	.222	.282	.222	.504
19	Mariners	5/1/1996	0-1	SEA	@	TEX	L 4-5	.000	33	4	8	1	0	1	4	4	1	4	0	0	39	12	2	0	1	1	1	.242	.333	.364	.697
20	Mariners	5/1/1998	0-1	SEA	vs	DET	L 3-17	.000	34	3	9	1	0	1	3	4	0	6	0	0	38	13	2	0	0	0	1	.265	.342	.382	.724
21	Mariners	5/1/1999	0-1	SEA	vs	TOR	L 3-9	.000	35	3	11	1	0	1	3	4	0	5	0	0	40	15	2	1	0	0	2	.314	.385	.429	.813
22	Mariners	5/1/2001	0-1	SEA	vs	BOS	L 0-2	.000	29	0	3	0	0	0	0	4	1	12	0	0	34	3	0	0	0	0	0	.103	.235	.103	.339
23	Mariners	5/1/2002	0-1	SEA	@	CWS	L 2-9	.000	28	2	6	0	0	0	1	4	0	4	2	0	33	6	0	0	1	1	2	.214	.303	.214	.517
24	Mariners	5/1/2003	0-1	SEA	@	NYY	L 1-2	.000	31	1	6	0	0	0	1	0	0	10	0	2	31	6	0	0	0	0	0	.194	.194	.194	.387
25	Mariners	5/1/2004	0-1	SEA	@	DET	L 2-4	.000	31	2	6	1	1	0	2	0	0	4	0	0	32	9	2	1	0	0	1	.194	.194	.290	.484
	Total		12-30					.286	1,403	143	352	62	9	28	138	119	13	288	24	17	1,552	516	99	7	10	8	34	.251	.313	.368	.681