Joe Peitz has the best career on-base percentage with 20+ at-bats, with an on-base percentage of .531.

Interpreted as:

best obp by a player ever minimum 20 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	Joe Peitz J. Peitz	.531	26	7	10	11	2	3	0	3	6	0	1	2		32	19	5	0				.423	.731	1.262	11	5.5	.550	188	5.3
2	Hyeseong Kim H. Kim	.485	31	14	9	14	1	0	1	5	2	0	5	3	0	33	18	2	0	0	0	0	.452	.581	1.065	8	4	.468	203	4
3	Ted Williams T. Williams	.482	7,706	2,292	1,798	2,654	525	71	521	1,839	2,021	39	709	24	4	9,791	4,884	1,117	5	20	86	197	.344	.634	1.116	2349	1,219.7	.493	188	1,067
4	Vince Sherlock V. Sherlock	.481	26	9	4	12	1	0	0	6	1	0	2	1		27	13	1	0			0	.462	.500	.981	6	2.5	.455	170	2.4
5	Dan O'Connor D. O'Connor	.481	26	6	3	12	1	1	0	5	1	0		5		27	15	2					.462	.577	1.058	8	3.6	.500	193	3.8
6	Babe Ruth B. Ruth	.474	8,399	2,503	2,174	2,873	506	136	714	2,214	2,062	43	1,330	123		10,617	5,793	1,356	113				.342	.690	1.164	2727	1,436.8	.513	197	1,369.6
7	John McGraw J. McGraw	.466	3,924	1,100	1,024	1,309	121	70	13	462	836	134	155	436		4,940	1,609	204	46				.334	.410	.876	1083	354	.433	141	309
8	Gale Staley G. Staley	.464	26	7	2	11	2	0	0	3	2	0	1	0	1	28	13	2	0				.423	.500	.964	6	2.2	.447	151	2
9	Cy Vorhees C. Vorhees	.462	23	11	3	9	0	0	0	3	3	0	3	0		26	9	0	0				.391	.391	.853	5	1.8	.418	158	1.8
10	Herb Goodall H. Goodall	.458	45	19	10	19	2	0	0	5	1	2		0		48	21	2					.422	.467	.925	12	4.5	.450	166	4.8
11	Billy Hamilton B. Hamilton	.455	6,283	1,594	1,697	2,164	242	95	40	742	1,189	89	271	914		7,608	2,716	377	47				.344	.432	.888	1716	578.6	.433	142	505.5
12	Glenn Williams G. Williams	.452	40	13	3	17	1	0	0	3	2	0	7	1	2	43	18	1	1	0	0	0	.425	.450	.902	8	2.7	.402	151	2.7
13	John Hattig J. Hattig	.448	24	13	2	8	1	0	0	3	5	0	8	0	0	29	9	1	0	0	0	1	.333	.375	.823	5	1.2	.380	128	1
14	Bill Higdon B. Higdon	.448	23	11	3	7	3	0	0	1	6	0	3	1	0	29	10	3	0			0	.304	.435	.883	5	1.7	.421	141	1.5
15	Suds Sutherland S. Sutherland	.448	27	17	4	11	1	0	0	7	1	1	4	0	0	29	12	1	0				.407	.444	.893	5	1.7	.420	134	1.3
16	Lou Gehrig L. Gehrig	.447	8,001	2,164	1,888	2,721	534	163	493	1,995	1,508	45	790	102		9,660	5,060	1,190	106			2	.340	.632	1.080	2265	1,046.8	.477	173	980
17	Dave Oliver D. Oliver	.444	22	7	2	7	0	1	0	3	4	1	0	0	0	29	9	1	2	0	0	0	.318	.409	.854	5	1.6	.393	145	1.5
18	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
19	Reggie Otero R. Otero	.440	23	14	1	9	0	0	0	5	2	0	2	0		26	9	0	1			0	.391	.391	.831	4	1.4	.401	136	1.1
20	Andy Kyle A. Kyle	.440	21	9	3	7	1	0	0	4	4	0	2	0		26	8	1	1				.333	.381	.821	4	1.3	.405	129	1
21	Tommy Watkins T. Watkins	.438	28	9	2	10	0	0	0	0	4	0	4	1	0	32	10	0	0	0	0	1	.357	.357	.795	5	1	.369	126	1
22	Bill Joyce B. Joyce	.435	3,310	906	822	971	153	106	70	609	721	108	303	266		4,163	1,546	329	24				.293	.467	.902	933	302.4	.430	139	267.6
23	Domingo Martinez D. Martinez	.435	22	15	4	9	0	0	2	6	1	0	8	0	0	23	15	2	0	0	0	0	.409	.682	1.117	6	3	.492	208	2.8
24	Johnny Johnson J. Johnson	.435	20	51	2	7	3	0	0	2	3	0	7	0		24	10	3	1			0	.350	.500	.935	4	1.9	.438	169	1.9
25	Rogers Hornsby R. Hornsby	.434	8,173	2,259	1,579	2,930	541	169	301	1,584	1,038	48	679	135		9,475	4,712	1,011	216				.358	.577	1.010	2018	899	.459	173	863.2