Between the 1990 and 1998 seasons, Frank Thomas had the best on-base percentage, with an on-base percentage of .443.

Interpreted as:

highest obp with a minimum of 1.55 PA per team game by a player 1990 to 1998

	NAME	OBP	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	SLG	OPS	WRC	WRAA	WOBA	WRC+	BRAA
1	Frank Thomas F. Thomas	.443	1,236	4,406	894	1,416	281	10	286	963	989	32	675	25	15	5,501	2,575	577	0	74	120	137	.321	.584	1.027	1157	496.2	.438	170	485.4
2	Barry Bonds B. Bonds	.438	1,332	4,539	1,000	1,385	279	40	327	993	1,073	42	685	328	92	5,712	2,725	646	1	57	248	90	.305	.600	1.038	1186	500.5	.435	173	510.6
3	Edgar Martinez E. Martinez	.428	1,153	4,128	768	1,323	323	11	172	664	757	50	609	31	24	4,979	2,184	506	7	37	64	113	.320	.529	.957	965	367.9	.418	154	338.3
4	Jeff Bagwell J. Bagwell	.411	1,155	4,197	778	1,276	279	21	221	835	736	71	779	128	47	5,071	2,260	521	3	64	105	109	.304	.538	.949	945	332.7	.407	156	355.5
5	Rickey Henderson R. Henderson	.411	1,140	3,949	843	1,075	181	13	128	417	894	51	654	426	100	4,926	1,666	322	8	24	28	62	.272	.422	.833	793	203	.379	136	209
6	Jim Thome J. Thome	.409	770	2,583	508	746	154	14	163	471	519	25	711	16	11	3,153	1,417	331	1	25	37	58	.289	.549	.958	602	211.6	.411	145	188
7	Mark McGwire M. McGwire	.409	1,068	3,481	673	926	151	0	340	809	818	50	899	9	5	4,393	2,097	491	2	42	97	79	.266	.602	1.011	887	363.5	.427	165	360.4
8	John Olerud J. Olerud	.403	1,228	4,176	643	1,258	283	11	153	666	695	49	569	5	10	4,976	2,022	447	6	50	103	116	.301	.484	.887	839	242.1	.387	136	222.4
9	John Kruk J. Kruk	.402	708	2,437	370	746	139	23	59	375	407	2	429	30	14	2,877	1,108	221	2	29	54	58	.306	.455	.856	460	127.7	.379	136	120
10	Lenny Dykstra L. Dykstra	.400	644	2,521	476	751	157	23	47	232	422	20	261	152	36	2,982	1,095	227	3	16	43	20	.298	.434	.835	465	114.4	.373	130	105
11	Gary Sheffield G. Sheffield	.400	1,037	3,648	630	1,070	202	16	193	662	622	64	446	132	59	4,391	1,883	411	5	52	74	87	.293	.516	.917	779	251.6	.397	147	253.8
12	Mike Piazza M. Piazza	.396	840	3,119	511	1,038	148	4	200	644	330	12	493	11	11	3,482	1,794	352	0	21	72	87	.333	.575	.972	668	236	.413	158	256.7
13	Dave Magadan D. Magadan	.396	946	2,753	361	798	142	8	29	329	495	8	368	9	7	3,309	1,043	179	21	32	31	66	.290	.379	.775	465	73.5	.354	119	73.2
14	Tim Salmon T. Salmon	.395	857	3,130	548	921	171	12	179	591	516	31	738	25	30	3,717	1,653	362	0	40	27	38	.294	.528	.923	669	208.5	.399	138	185.8
15	Tony Phillips T. Phillips	.395	1,220	4,623	870	1,275	229	21	112	511	906	26	915	110	69	5,619	1,882	362	26	38	36	75	.276	.407	.802	839	167.7	.364	120	139.1
16	Mo Vaughn M. Vaughn	.394	1,046	3,828	628	1,165	199	10	230	752	519	71	954	28	17	4,452	2,074	439	0	34	118	94	.304	.542	.936	800	255.6	.398	136	212.8
17	Jason Kendall J. Kendall	.393	423	1,435	220	442	95	12	23	166	135	77	134	49	13	1,670	630	130	6	17	16	24	.308	.439	.832	258	49.6	.369	121	43.5
18	Brett Butler B. Butler	.392	1,013	3,801	617	1,143	108	57	18	260	565	19	442	251	116	4,492	1,419	183	82	25	10	25	.301	.373	.765	621	93	.351	120	106.7
19	Rusty Greer R. Greer	.391	662	2,435	409	756	151	17	83	402	326	13	378	23	10	2,807	1,190	251	5	28	12	50	.310	.489	.879	472	120.6	.384	124	90.4
20	Brian Giles B. Giles	.391	299	857	150	243	48	4	39	157	155	4	139	26	8	1,033	416	91	4	13	14	23	.284	.485	.876	169	41	.380	124	33.2
21	Jack Clark J. Clark	.390	336	1,072	166	263	41	2	58	182	256	7	311	5	6	1,347	482	101	0	12	17	33	.245	.450	.840	212	62.1	.377	132	49.8
22	Randy Milligan R. Milligan	.390	536	1,670	239	437	78	5	55	231	352	9	331	6	11	2,045	690	138	0	14	8	53	.262	.413	.803	306	74.8	.367	128	67.5
23	Manny Ramirez M. Ramirez	.390	702	2,509	442	758	169	6	154	517	359	21	532	25	19	2,923	1,401	329	2	32	29	77	.302	.558	.948	540	174.6	.404	139	151.4
24	Tony Gwynn T. Gwynn	.389	1,162	4,570	685	1,574	303	33	78	626	360	10	174	90	38	5,007	2,177	414	11	56	107	137	.344	.476	.865	797	198.3	.375	132	200.6
25	Ben Grieve B. Grieve	.389	179	676	106	197	47	2	21	113	98	10	148	2	2	786	311	70	1	1	4	19	.291	.460	.849	126	28.7	.375	125	25.3