Ted Williams had the highest on-base percentage in the AL in 1942, with an on-base percentage of .499.

Interpreted as:

best obp with a minimum of 3.1 PA per team game by a player in the al in 1942

	NAME	OBP	SEASON	TM	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	GIDP	AVG	SLG	OPS	WRC	WRAA	WOBA	WRC+	BRAA
1	Ted Williams T. Williams	.499	1942	BSA	150	522	141	186	34	5	36	137	145	4	51	3	2	671	338	75	0	12	.356	.648	1.147	168	96.2	.524	209	86.5
2	Charlie Keller C. Keller	.417	1942	NYY	152	544	106	159	24	9	26	108	114	2	61	14	2	661	279	59	1	5	.292	.513	.930	123	52.9	.435	159	46.2
3	Wally Judnich W. Judnich	.413	1942	SLA	132	457	78	143	22	6	17	82	74	4	41	3	2	544	228	45	9	7	.313	.499	.912	99	40.9	.428	150	32.5
4	Les Fleming L. Fleming	.412	1942	CLE	156	548	71	160	27	4	14	82	106	6	57	6	8	662	237	45	2	13	.292	.432	.845	109	38.3	.404	144	34.3
5	Joe Gordon J. Gordon	.409	1942	NYY	147	538	88	173	29	4	18	103	79	1	95	12	6	625	264	51	7	22	.322	.491	.900	111	44.7	.423	152	38.4
6	Roy Cullenbine R. Cullenbine	.405	1942	TOT	123	427	61	118	33	1	6	66	92	0	40	1	4	524	171	40	5	6	.276	.400	.805	80	24.4	.388	129	18.3
7	Bobby Estalella B. Estalella	.400	1942	WSH	133	429	68	119	24	5	8	65	85	3	42	5	2	517	177	37	0	19	.277	.413	.813	80	24.8	.390	132	19.5
8	Harlond Clift H. Clift	.394	1942	SLA	143	541	108	148	39	4	7	55	106	2	48	6	4	656	216	50	7	9	.274	.399	.794	97	27.6	.382	122	17.4
9	Stan Spence S. Spence	.384	1942	WSH	149	629	94	203	27	15	4	79	62	1	16	5	2	696	272	46	4	7	.323	.432	.817	105	31	.386	129	24
10	Bob Johnson B. Johnson	.384	1942	PHA	149	550	78	160	35	7	13	80	82	1	61	3	2	634	248	55	1	16	.291	.451	.835	100	32.3	.395	132	23.8
11	Chet Laabs C. Laabs	.380	1942	SLA	144	520	90	143	21	7	27	99	88	0	88	0	3	614	259	55	6	12	.275	.498	.878	104	38.6	.411	140	29.1
12	Lou Boudreau L. Boudreau	.379	1942	CLE	147	506	57	143	18	10	2	58	75	4	39	7	16	604	187	30	19	12	.283	.370	.749	81	16.5	.362	118	12.9
13	George Case G. Case	.377	1942	WSH	125	513	101	164	26	2	5	43	44	3	30	44	6	563	209	33	3	8	.320	.407	.784	80	20	.373	121	14.3
14	Joe DiMaggio J. DiMaggio	.376	1942	NYY	154	610	123	186	29	13	21	114	68	2	36	4	2	680	304	63	0	9	.305	.498	.875	114	41.5	.409	143	34.6
15	Johnny Pesky J. Pesky	.375	1942	BSA	147	620	105	205	29	9	2	51	42	2	36	12	7	686	258	40	22	8	.331	.416	.791	98	24.9	.374	118	15
16	Bobby Doerr B. Doerr	.369	1942	BSA	144	545	71	158	35	5	15	102	67	1	55	4	4	625	248	55	12	11	.290	.455	.824	95	29	.388	127	20
17	Barney McCosky B. McCosky	.365	1942	DET	154	600	75	176	28	11	7	50	68	0	37	11	5	680	247	46	12	12	.293	.412	.777	94	22	.369	111	9.3
18	Dom DiMaggio D. DiMaggio	.364	1942	BSA	151	622	110	178	36	8	14	48	70	6	52	16	10	702	272	58	4	9	.286	.437	.801	103	27.8	.379	121	17.7
19	Pinky Higgins P. Higgins	.362	1942	DET	143	499	65	133	34	2	11	79	72	3	21	3	7	579	204	47	5	21	.267	.409	.771	80	18.6	.368	111	7.8
20	Elmer Valo E. Valo	.355	1942	PHA	133	459	64	115	13	10	2	40	70	4	21	13	8	542	154	25	9	14	.251	.336	.690	63	5	.336	96	-2.3
21	Wally Moses W. Moses	.353	1942	CWS	146	577	73	156	28	4	7	49	74	0	27	16	10	652	213	39	1	5	.270	.369	.722	80	11.1	.347	105	3.8
22	Tommy Henrich T. Henrich	.352	1942	NYY	127	483	77	129	30	5	13	67	58	5	42	4	4	555	208	48	9	3	.267	.431	.782	78	18.7	.370	120	13
23	Tony Lupien T. Lupien	.351	1942	BSA	128	463	63	130	25	7	3	70	50	0	20	10	12	525	178	35	12	4	.281	.384	.735	66	10.1	.350	104	2.5
24	Jeff Heath J. Heath	.350	1942	CLE	147	568	82	158	37	13	10	76	62	1	66	9	9	634	251	60	3	10	.278	.442	.792	90	22.2	.372	124	18.4
25	Joe Kuhel J. Kuhel	.347	1942	CWS	115	413	60	103	14	4	4	52	60	2	22	22	9	482	137	22	7	5	.249	.332	.679	54	2.7	.331	95	-2.7