Ray Jansen has the highest career on-base percentage with 4+ at-bats, with an on-base percentage of .800.

Interpreted as:

best obp by a player ever minimum 4 ab

	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	Ray Jansen R. Jansen	.800	5	1	0	4	0	0	0	0	0	0	0	0		5	4	0	0				.800	.800	1.600	2	1.5	.775	406	1.6
2	Dan Kerwin D. Kerwin	.778	6	2	1	4	1	0	0	1	2	1	0	0		9	5	1	0				.667	.833	1.611	4	2.6	.717	303	2.4
3	Carl Miles C. Miles	.750	4	2	1	3	1	0	0	1	0	0	0	0	0	4	4	1	0			0	.750	1.000	1.750	2	1.4	.788	350	1.4
4	Aubrey Epps A. Epps	.750	4	1	1	3	0	1	0	3	0	0	0	0		4	5	1	0			0	.750	1.250	2.000	2	1.7	.874	436	1.7
5	Dusty Wathan D. Wathan	.667	5	3	1	3	1	0	0	1	0	1	1	0	0	6	4	1	0	0	0	0	.600	.800	1.467	2	1.5	.629	295	1.4
6	Keith Johnson K. Johnson	.667	4	6	2	2	0	0	0	0	2	0	0	0	0	7	2	0	1	0	0	0	.500	.500	1.167	2	1.2	.541	225	1.2
7	Tom Wiedenbauer T. Wiedenbauer	.667	6	4	0	4	1	0	0	2	0	0	2	0	0	6	5	1	0	0	0	0	.667	.833	1.500	2	1.6	.668	336	1.7
8	John Burrows J. Burrows	.667	4	27	0	2	0	0	0	0	2	0	2	0		6	2	0	0			0	.500	.500	1.167	2	1	.561	245	1
9	Pete McClanahan P. McClanahan	.667	4	7	2	2	0	0	0	0	2	0	0	0		6	2	0	0				.500	.500	1.167	2	1	.558	233	1
10	Bill Pounds B. Pounds	.667	5	2	1	3	0	0	0	1	0	1	1	0		6	3	0	0				.600	.600	1.267	2	1.3	.603	262	1.2
11	Carlos Rivero C. Rivero	.625	7	4	1	4	2	0	1	3	1	0	0	0	0	8	9	3	0	0	0	0	.571	1.286	1.911	4	2.9	.785	424	2.9
12	Zack Britton Z. Britton	.625	8	22	3	5	1	0	1	2	0	0	1	0	0	8	9	2	0	0	0	0	.625	1.125	1.750	4	2.8	.753	391	2.7
13	John Harrell J. Harrell	.625	6	2	0	3	0	0	0	2	2	0	1	0	0	8	3	0	0	0	0	0	.500	.500	1.125	2	1.2	.519	228	1.2
14	Frederick Graf F. Graf	.625	5	4	1	2	1	0	0	2	3	0	3	0		9	3	1	1				.400	.600	1.225	3	1.5	.569	249	1.5
15	Pussy Tebeau P. Tebeau	.625	6	2	3	3	0	0	0	1	2	0	1	1		8	3	0	0				.500	.500	1.125	3	1.4	.558	197	1.3
16	Luis Silverio L. Silverio	.615	11	8	7	6	2	1	0	3	2	0	3	1	1	14	10	3	1	0	0	0	.545	.909	1.524	5	3.5	.649	319	3.4
17	Brandon Dickson B. Dickson	.600	5	9	2	3	0	0	0	0	0	0	2	0	0	5	3	0	0	0	0	0	.600	.600	1.200	1	0.9	.533	247	0.9
18	Nick Bierbrodt N. Bierbrodt	.600	8	7	3	4	1	0	0	0	2	0	2	0	0	13	5	1	3	0	0	0	.500	.625	1.225	4	2	.531	208	1.9
19	Rick Croushore R. Croushore	.600	4	101	1	2	0	0	0	0	1	0	1	0	0	8	2	0	3	0	0	0	.500	.500	1.100	2	1.2	.505	178	1.1
20	Ed White E. White	.600	4	3	0	2	0	0	0	0	1	0	1	0	0	5	2	0	0	0	0	0	.500	.500	1.100	1	0.7	.508	210	0.7
21	Stan Goletz S. Goletz	.600	5	5	0	3	0	0	0	0	0	0	2	0	0	5	3	0	0			0	.600	.600	1.200	1	0.9	.563	222	0.8
22	Tom Cantwell T. Cantwell	.600	5	6	1	3	1	0	0	1	0	0	3	0		5	4	1	0				.600	.800	1.400	2	1.2	.675	320	1.2
23	Frank Cross F. Cross	.600	5	1	0	3	0	0	0	0	0	0	2	0		5	3	0	0				.600	.600	1.200	2	0.9	.570	226	0.9
24	Talmadge Nunnari T. Nunnari	.583	5	18	2	1	0	0	0	1	6	0	2	0	0	12	1	0	0	1	1	0	.200	.200	.783	2	0.7	.410	141	0.7
25	Joe Burke J. Burke	.583	10	3	3	5	0	0	0	3	1	1	2	0		12	5	0					.500	.500	1.083	4	2	.538	204	1.9