Chick Hafey had the best on-base percentage in the NL in 1931, with an on-base percentage of .404.

Interpreted as:

best obp with a minimum of 3.1 PA per team game by an nl player in 1931

	NAME	OBP	SEASON	TM	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	PA	TB	XBH	SH	AVG	SLG	OPS	WRC	WRAA	WOBA	WRC+	BRAA
1	Chick Hafey C. Hafey	.404	1931	SLN	122	450	94	157	35	8	16	95	39	3	43	11	494	256	59	2	.349	.569	.973	100	38.7	.437	156	35.6
2	Kiki Cuyler K. Cuyler	.404	1931	CHC	154	613	110	202	37	12	9	88	72	5	54	13	710	290	58	20	.330	.473	.877	124	36.6	.404	136	33.1
3	Paul Waner P. Waner	.404	1931	PIT	150	559	88	180	35	10	6	70	73	4	21	6	646	253	51	10	.322	.453	.857	110	29.7	.397	133	27.3
4	George Grantham G. Grantham	.400	1931	PIT	127	465	91	142	26	6	10	46	71	2	50	5	555	210	42	17	.305	.452	.851	93	24.5	.394	131	22.4
5	Chuck Klein C. Klein	.398	1931	PHN	148	594	121	200	34	10	31	121	59	1	49	7	656	347	75	2	.337	.584	.982	133	52.2	.439	146	39.1
6	Bill Terry B. Terry	.397	1931	NYG	153	611	121	213	43	20	9	112	47	2	36	8	662	323	72	2	.349	.529	.926	124	41.8	.418	148	40.9
7	Lefty O'Doul L. O'Doul	.396	1931	BKN	134	512	85	172	32	11	7	75	48	3	16	5	564	247	50	1	.336	.482	.879	98	28.3	.402	137	26.9
8	Charlie Grimm C. Grimm	.393	1931	CHC	146	531	65	176	33	11	4	66	53	1	29	1	596	243	48	11	.331	.458	.851	99	25	.392	129	22
9	Mel Ott M. Ott	.392	1931	NYG	138	497	104	145	23	8	29	115	80	2	44	10	580	271	60	1	.292	.545	.937	110	38.1	.421	150	37.4
10	Woody English W. English	.391	1931	CHC	156	634	117	202	38	8	2	53	68	7	80	12	727	262	48	18	.319	.413	.804	111	21.4	.376	119	17.7
11	Don Hurst D. Hurst	.386	1931	PHN	137	489	63	149	37	5	11	91	64	1	28	8	567	229	53	13	.305	.468	.855	94	24.1	.392	118	12.9
12	Wally Berger W. Berger	.380	1931	BSN	156	617	94	199	44	8	19	84	55	2	70	13	678	316	71	4	.323	.512	.892	119	35	.404	140	35
13	Harvey Hendrick H. Hendrick	.379	1931	TOT	138	531	74	167	32	9	1	75	53	2	40	3	594	220	42	8	.315	.414	.793	88	14.2	.369	118	14.1
14	Tony Cuccinello T. Cuccinello	.374	1931	CIN	154	575	67	181	39	11	2	93	54	0	28	1	639	248	52	10	.315	.431	.805	96	16.5	.371	120	16.5
15	Frankie Frisch F. Frisch	.368	1931	SLN	131	518	96	161	24	4	4	82	45	2	13	28	570	205	32	5	.311	.396	.764	79	8	.357	106	4.5
16	Charlie Gelbert C. Gelbert	.365	1931	SLN	131	447	61	129	29	5	1	62	54	0	31	7	505	171	35	4	.289	.383	.748	67	4.9	.351	103	1.7
17	Babe Herman B. Herman	.365	1931	BKN	151	610	93	191	43	16	18	97	50	0	65	17	661	320	77	1	.313	.525	.890	114	31.9	.399	135	30.2
18	Del Bissonette D. Bissonette	.354	1931	BKN	152	587	90	170	19	14	12	87	59	0	53	4	649	253	45	3	.290	.431	.785	92	11.4	.361	112	9.8
19	Pie Traynor P. Traynor	.354	1931	PIT	155	615	81	183	37	15	2	103	54	0	28	6	677	256	54	8	.298	.416	.771	92	8.7	.355	107	6.2
20	Travis Jackson T. Jackson	.353	1931	NYG	145	555	65	172	26	10	5	71	36	1	23	13	594	233	41	2	.310	.420	.773	81	7.9	.356	109	7.1
21	Lloyd Waner L. Waner	.352	1931	PIT	154	681	90	214	25	13	4	57	39	1	16	7	726	277	42	5	.314	.407	.759	96	6.5	.350	104	3.8
22	Taylor Douthit T. Douthit	.352	1931	TOT	131	507	63	142	20	3	1	45	53	3	33	5	572	171	24	9	.280	.337	.689	66	-4.8	.328	92	-5.8
23	Freddy Leach F. Leach	.348	1931	NYG	129	515	75	159	30	5	6	61	29	2	9	4	552	217	41	6	.309	.421	.769	75	6.5	.354	108	5.7
24	Sparky Adams S. Adams	.340	1931	SLN	143	608	97	178	46	5	1	40	42	2	24	16	658	237	52	6	.293	.390	.730	81	-0.3	.339	95	-4.4
25	George Watkins G. Watkins	.336	1931	SLN	131	503	93	145	30	13	13	51	31	5	66	15	541	240	56	2	.288	.477	.813	79	11.9	.367	112	8.6