Since 1974, Barry Bonds has the best on-base percentage with 8,000+ at-bats, with an on-base percentage of .444.

Interpreted as:

highest obp by a player since 1974 in 8000+ at bats

	NAME	OBP	AB	G	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	Barry Bonds B. Bonds	.444	9,847	2,986	2,227	2,935	601	77	762	1,996	2,558	106	1,539	514	141	12,606	5,976	1,440	4	91	688	165	.298	.607	1.051	2663	1,143.3	.435	172	1,142
2	Frank Thomas F. Thomas	.419	8,199	2,322	1,494	2,468	495	12	521	1,704	1,667	87	1,397	32	23	10,074	4,550	1,028	0	121	168	226	.301	.555	.974	1954	721.1	.416	154	692
3	Wade Boggs W. Boggs	.415	9,180	2,439	1,513	3,010	578	61	118	1,014	1,412	23	745	24	35	10,740	4,064	757	29	96	180	236	.328	.443	.858	1746	493.9	.381	132	411
4	Manny Ramirez M. Ramirez	.411	8,244	2,302	1,544	2,574	547	20	555	1,831	1,329	109	1,813	38	33	9,774	4,826	1,122	2	90	216	243	.312	.585	.996	1931	719.5	.418	153	658.7
5	Jim Thome J. Thome	.402	8,422	2,543	1,583	2,328	451	26	612	1,699	1,747	69	2,548	19	20	10,313	4,667	1,089	1	74	173	165	.276	.554	.956	1925	653.9	.406	145	589.5
6	Rickey Henderson R. Henderson	.401	10,961	3,081	2,295	3,055	510	66	297	1,115	2,190	98	1,694	1,406	335	13,346	4,588	873	30	67	61	172	.279	.419	.820	2074	509.6	.372	132	507.9
7	Chipper Jones C. Jones	.401	8,984	2,499	1,619	2,726	549	38	468	1,623	1,512	18	1,409	150	46	10,614	4,755	1,055	3	97	177	253	.303	.529	.930	1904	598.1	.397	141	563
8	Bobby Abreu B. Abreu	.395	8,480	2,425	1,453	2,470	574	59	288	1,363	1,476	33	1,840	400	128	10,081	4,026	921	7	85	115	165	.291	.475	.870	1648	417.8	.378	129	382
9	Gary Sheffield G. Sheffield	.393	9,217	2,576	1,636	2,689	467	27	509	1,676	1,475	135	1,171	253	104	10,947	4,737	1,003	9	111	130	235	.292	.514	.907	1907	574.5	.391	141	567.2
10	Tony Gwynn T. Gwynn	.388	9,288	2,440	1,383	3,141	543	85	135	1,138	790	24	434	319	125	10,232	4,259	763	45	85	203	259	.338	.459	.847	1582	379.2	.370	132	390.4
11	Freddie Freeman F. Freeman	.386	8,114	2,179	1,379	2,431	547	33	367	1,322	1,070	113	1,763	104	32	9,363	4,145	947	0	66	142	172	.300	.511	.897	1600	506.4	.381	142	474.4
12	Tim Raines T. Raines	.385	8,872	2,502	1,571	2,605	430	113	170	980	1,330	42	966	808	146	10,359	3,771	713	39	76	148	142	.294	.425	.810	1517	318.9	.361	125	306.9
13	Mark Grace M. Grace	.383	8,065	2,245	1,179	2,445	511	45	173	1,146	1,075	34	642	70	48	9,290	3,565	729	17	99	114	192	.303	.442	.825	1393	277.1	.364	120	225.5
14	Miguel Cabrera M. Cabrera	.382	10,356	2,797	1,551	3,174	627	17	511	1,881	1,258	74	2,105	40	21	11,796	5,368	1,155	5	103	238	364	.306	.518	.901	1981	585.3	.382	139	547.8
15	Alex Rodriguez A. Rodriguez	.380	10,566	2,784	2,021	3,115	548	31	696	2,086	1,338	176	2,287	329	76	12,207	5,813	1,275	16	111	97	261	.295	.550	.930	2178	690.1	.395	141	629.5
16	David Ortiz D. Ortiz	.380	8,640	2,408	1,419	2,472	632	19	541	1,768	1,319	38	1,750	17	9	10,091	4,765	1,192	2	92	209	236	.286	.552	.931	1760	559.9	.392	140	484.1
17	Vladimir Guerrero V. Guerrero	.379	8,155	2,147	1,328	2,590	477	46	449	1,496	737	103	985	181	94	9,059	4,506	972	0	64	250	277	.318	.553	.931	1575	464.6	.390	136	419
18	Derek Jeter D. Jeter	.377	11,195	2,747	1,923	3,465	544	66	260	1,311	1,082	170	1,840	358	97	12,602	4,921	870	97	58	39	287	.310	.440	.817	1877	346.6	.360	119	305.9
19	Fred McGriff F. McGriff	.377	8,757	2,460	1,349	2,490	441	24	493	1,550	1,305	39	1,882	72	38	10,174	4,458	958	2	71	171	226	.284	.509	.886	1678	454.1	.383	134	415.9
20	Brett Butler B. Butler	.377	8,180	2,213	1,359	2,375	277	131	54	578	1,129	38	907	558	257	9,545	3,076	462	147	51	23	62	.290	.376	.753	1270	171	.344	115	163.4
21	Albert Pujols A. Pujols	.374	11,421	3,080	1,914	3,384	686	16	703	2,218	1,373	123	1,404	117	43	13,041	6,211	1,405	1	123	316	426	.296	.544	.918	2233	685	.385	141	673
22	Willie Randolph W. Randolph	.373	8,018	2,202	1,239	2,210	316	65	54	687	1,243	38	675	271	94	9,462	2,818	435	99	64	37	219	.276	.351	.724	1181	119.4	.335	110	108.3
23	Kenny Lofton K. Lofton	.372	8,120	2,103	1,528	2,428	383	116	130	781	945	32	1,016	622	160	9,234	3,433	629	72	65	43	111	.299	.423	.794	1303	163.2	.352	109	111.9
24	Dwight Evans D. Evans	.372	8,657	2,469	1,422	2,368	467	71	374	1,346	1,344	52	1,632	73	59	10,177	4,099	912	49	75	58	217	.274	.473	.845	1595	457.3	.377	130	358.9
25	Roberto Alomar R. Alomar	.371	9,073	2,379	1,508	2,724	504	80	210	1,134	1,032	50	1,140	474	114	10,400	4,018	794	148	97	62	206	.300	.443	.814	1526	275.7	.359	118	230.8