Ken Griffey Jr. launched the most grand slams in 1991, with 3 grand slams.

Interpreted as:

most grand slams by a player 1991

	NAME	GRANDSLAM	SEASON	TM	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Ken Griffey Jr. K. Griffey Jr.	3	1991	SEA	154	548	76	179	42	1	22	100	71	1	82	18	6	633	289	65	4	9	21	10	.327	.399	.527	.926
2	Sid Bream S. Bream	2	1991	ATL	91	265	32	67	12	0	11	45	25	0	31	0	3	298	112	23	4	4	5	8	.253	.313	.423	.736
3	Harold Baines H. Baines	2	1991	OAK	141	488	76	144	25	1	20	90	72	1	67	0	1	566	231	46	0	5	22	12	.295	.383	.473	.857
4	Jose Canseco J. Canseco	2	1991	OAK	154	572	115	152	32	1	44	122	78	9	152	26	6	665	318	77	0	6	8	16	.266	.359	.556	.915
5	Will Clark W. Clark	2	1991	SFG	148	565	84	170	32	7	29	116	51	2	91	4	2	622	303	68	0	4	12	5	.301	.359	.536	.895
6	Andre Dawson A. Dawson	2	1991	CHC	149	563	69	153	21	4	31	104	22	5	80	4	5	596	275	56	0	6	3	10	.272	.302	.488	.790
7	Shane Mack S. Mack	2	1991	MIN	143	442	79	137	27	8	18	74	34	6	79	13	9	489	234	53	2	5	1	11	.310	.363	.529	.893
8	Fred McGriff F. McGriff	2	1991	SDP	153	528	84	147	19	1	31	106	105	2	135	4	1	642	261	51	0	7	26	14	.278	.396	.494	.890
9	Jack Clark J. Clark	2	1991	BOS	140	481	75	120	18	1	28	87	96	3	133	0	2	585	224	47	0	5	3	17	.249	.374	.466	.840
10	Robin Ventura R. Ventura	2	1991	CWS	157	606	92	172	25	1	23	100	80	4	67	2	4	705	268	49	8	7	3	22	.284	.367	.442	.810
11	Tim Spehr T. Spehr	1	1991	KCR	37	74	7	14	5	0	3	14	9	1	18	1	0	88	28	8	3	1	0	2	.189	.282	.378	.661
12	Reggie Jefferson R. Jefferson	1	1991	TOT	31	108	11	21	3	0	3	13	4	0	24	0	0	113	33	6	0	1	0	1	.194	.221	.306	.527
13	Pedro Munoz P. Munoz	1	1991	MIN	51	138	15	39	7	1	7	26	9	1	31	3	0	151	69	15	1	2	0	2	.283	.327	.500	.827
14	Juan Gonzalez J. Gonzalez	1	1991	TEX	142	545	78	144	34	1	27	102	42	5	118	4	4	595	261	62	0	3	7	10	.264	.321	.479	.800
15	Orlando Merced O. Merced	1	1991	PIT	120	411	83	113	17	2	10	50	64	1	81	8	4	478	164	29	1	1	4	6	.275	.373	.399	.772
16	Kevin Romine K. Romine	1	1991	BOS	44	55	7	9	2	0	1	7	3	0	10	1	1	58	14	3	0	0	0	1	.164	.207	.255	.461
17	Brian Downing B. Downing	1	1991	TEX	123	407	76	113	17	2	17	49	58	8	70	1	1	476	185	36	1	2	7	7	.278	.377	.455	.831
18	Max Venable M. Venable	1	1991	CAL	82	187	24	46	8	2	3	21	11	2	30	2	1	206	67	13	4	2	2	5	.246	.292	.358	.650
19	Craig Grebeck C. Grebeck	1	1991	CWS	107	224	37	63	16	3	6	31	38	1	40	1	3	268	103	25	4	1	0	3	.281	.386	.460	.846
20	Joe Orsulak J. Orsulak	1	1991	BAL	143	486	57	135	22	1	5	43	28	4	45	6	2	521	174	28	0	3	1	9	.278	.321	.358	.679
21	Darrin Jackson D. Jackson	1	1991	SDP	122	359	51	94	12	1	21	49	27	2	66	5	3	394	171	34	3	3	2	5	.262	.315	.476	.791
22	Chico Walker C. Walker	1	1991	CHC	124	374	51	96	10	1	6	34	33	0	57	13	5	411	126	17	1	3	2	3	.257	.315	.337	.652
23	Todd Benzinger T. Benzinger	1	1991	TOT	129	416	36	109	18	5	3	51	27	3	66	4	6	451	146	26	2	3	4	7	.262	.310	.351	.661
24	Jeff Blauser J. Blauser	1	1991	ATL	129	352	49	91	14	3	11	54	54	2	59	5	6	415	144	28	4	3	4	4	.259	.358	.409	.767
25	Kal Daniels K. Daniels	1	1991	LAD	137	461	54	115	15	1	17	73	63	1	116	6	1	531	183	33	0	6	4	9	.249	.337	.397	.734

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StatMuse has game-level data for grand slams going back to the 1920 season.

Some of the information used here was obtained free of charge from Retrosheet.

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Mariners	39	39	.500
Athletics	38	39	.494	0.5
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DATE	MATCHUP			TIME (ET)
Sun 6/21	BOS	@	SEA	4:10 PM
Tue 6/23	SEA	@	PIT	6:40 PM
Wed 6/24	SEA	@	PIT	6:40 PM
Thu 6/25	SEA	@	PIT	12:35 PM
Fri 6/26	SEA	@	CLE	7:10 PM

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Braves	48	27	.640
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Marlins	39	38	.506	10.0
Mets	34	42	.447	14.5
NL Central	W	L	PCT	GB
Brewers	45	29	.608
Cardinals	40	34	.541	5.0
Cubs	40	37	.519	6.5
Pirates	38	39	.494	8.5
Reds	36	39	.480	9.5
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Dodgers	49	28	.636
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Mariners	39	39	.500
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Fri 6/5	SFG	@	CHC	18-3
Fri 6/5	CWS	@	PHI	6-8
Fri 6/5	BOS	@	NYY	5-3
Fri 6/5	BAL	@	TOR	13-3
Fri 6/5	ATH	@	HOU	1-5

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DATE	MATCHUP			TIME (ET)
Sun 6/21	MIL	@	ATL	1:35 PM
Sun 6/21	CIN	@	NYY	1:35 PM
Sun 6/21	SFG	@	MIA	1:40 PM
Sun 6/21	WSH	@	TBR	1:40 PM
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Ken Griffey Jr. launched the most grand slams in 1991, with 3 grand slams.

Interpreted as:

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