who was on base most often when a grand slam was hit

Hank Aaron had 3,771 hits when hitting >0 grand slams in his career.

	NAME	H	GRANDSLAM	G	AB	R	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Hank Aaron H. Aaron	3,771	2	3,298	12,364	2,175	624	98	755	2,297	1,403	32	1,381	240	73	13,941	6,856	1,477	21	121	293	330	.305	.374	.555	.929
2	Vada Pinson V. Pinson	2,757	1	2,470	9,645	1,365	485	127	256	1,169	574	54	1,197	306	124	10,403	4,264	868	52	78	68	166	.286	.327	.442	.769
3	Ron Fairly R. Fairly	1,913	3	2,442	7,184	931	307	33	215	1,044	1,052	40	877	35	33	8,437	2,931	555	96	65	129	160	.266	.360	.408	.768
4	Willie McCovey W. McCovey	2,211	4	2,588	8,197	1,229	353	46	521	1,556	1,346	69	1,550	26	21	9,687	4,219	920	5	70	260	179	.270	.375	.515	.889
5	Billy Williams B. Williams	2,711	1	2,488	9,350	1,410	434	88	426	1,474	1,045	43	1,047	90	49	10,519	4,599	948	8	73	182	199	.290	.361	.492	.853
6	Tim McCarver T. McCarver	1,501	1	1,909	5,529	590	242	57	97	645	548	30	422	61	49	6,206	2,148	396	35	64	120	99	.271	.337	.388	.725
7	Tommy Davis T. Davis	2,121	2	1,999	7,222	811	272	35	153	1,052	379	32	754	136	58	7,736	2,922	460	35	68	67	220	.294	.329	.405	.733
8	Ron Santo R. Santo	2,254	1	2,243	8,144	1,138	365	67	342	1,331	1,108	38	1,343	35	41	9,397	3,779	774	13	94	94	256	.277	.362	.464	.826
9	Willie Davis W. Davis	2,561	1	2,429	9,174	1,217	395	138	182	1,053	418	51	976	399	130	9,822	3,778	715	83	96	75	127	.279	.311	.412	.723
10	Deron Johnson D. Johnson	1,447	2	1,765	5,941	705	247	33	245	923	584	20	1,318	11	18	6,619	2,495	525	13	61	54	165	.244	.310	.420	.730
11	Carl Yastrzemski C. Yastrzemski	3,419	2	3,308	11,988	1,816	646	59	452	1,844	1,845	40	1,395	168	115	13,991	5,539	1,157	13	105	190	325	.285	.379	.462	.841
12	Phil Roof P. Roof	463	1	857	2,151	190	69	13	43	209	184	23	505	11	10	2,404	687	125	40	6	18	68	.215	.283	.319	.603
13	Bill Freehan B. Freehan	1,591	1	1,774	6,074	706	241	35	200	758	626	114	754	24	22	6,900	2,502	476	38	48	67	139	.262	.340	.412	.752
14	Boog Powell B. Powell	1,776	1	2,042	6,681	890	269	11	339	1,187	1,000	29	1,226	20	20	7,809	3,084	619	27	72	140	164	.266	.360	.462	.822
15	Cookie Rojas C. Rojas	1,660	1	1,822	6,309	713	254	25	54	593	396	20	487	74	68	6,871	2,126	333	87	59	30	179	.263	.306	.337	.643
16	Tony Oliva T. Oliva	1,917	1	1,676	6,301	871	329	48	220	947	449	59	645	86	55	6,880	3,002	597	14	57	131	140	.304	.353	.476	.830
17	Bob Bailey B. Bailey	1,564	1	1,931	6,082	772	234	43	189	773	852	17	1,126	85	83	7,043	2,451	466	40	52	67	198	.257	.347	.403	.750
18	Willie Stargell W. Stargell	2,232	3	2,360	7,927	1,195	423	55	475	1,540	937	79	1,936	17	16	9,027	4,190	953	9	75	227	144	.282	.360	.529	.889
19	Ken McMullen K. McMullen	1,273	1	1,583	5,131	568	172	26	156	606	508	17	814	20	19	5,728	1,965	354	34	38	47	133	.248	.316	.383	.699
20	Bobby Darwin B. Darwin	559	2	646	2,224	250	76	16	83	328	160	37	577	15	9	2,436	916	175	3	12	13	75	.251	.311	.412	.723
21	Rusty Staub R. Staub	2,716	4	2,951	9,720	1,189	499	47	292	1,466	1,255	79	888	47	33	11,229	4,185	838	56	119	193	298	.279	.362	.431	.793
22	Jimmy Wynn J. Wynn	1,665	2	1,920	6,653	1,105	285	39	291	964	1,224	27	1,426	225	101	8,010	2,901	615	32	74	84	119	.250	.366	.436	.802
23	Dick Allen D. Allen	1,848	2	1,749	6,332	1,099	320	79	351	1,119	894	16	1,556	133	51	7,314	3,379	750	19	53	138	163	.292	.378	.534	.912
24	Willie Horton W. Horton	1,993	3	2,028	7,298	873	284	40	325	1,163	620	58	1,315	20	38	8,052	3,332	649	17	59	94	197	.273	.332	.457	.789
25	Rico Carty R. Carty	1,677	2	1,651	5,606	712	278	17	204	890	642	13	661	21	26	6,318	2,601	499	3	54	65	206	.299	.369	.464	.833