Bill Walker had the best ERA in the NL in 1931, with an ERA of 2.26.

Interpreted as:

Who had the best era with a minimum of 1 IP per team game in the nl in 1931?

	NAME	ERA	SEASON	TM	G	W	L	W%	GS	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Bill Walker B. Walker	2.26	1931	NYG	37	16	9	.640	28	121	19	6	5	239.1	212	60	78	6	64	3	7	991	2	4.55	2.41	1.89	0.23	12.2	6.5	1.15	.258	2.93	60	3.27	84	7.97	16.3
2	Carl Hubbell C. Hubbell	2.65	1931	NYG	36	14	12	.538	30	155	21	4	3	248.0	211	73	88	14	67	4	5	1,010	3	5.63	2.43	2.31	0.51	15.3	6.6	1.12	.256	3.19	71	3.46	89	7.66	11.5
3	Ed Brandt E. Brandt	2.92	1931	BSN	33	18	11	.621	29	112	23	3	2	250.0	228	81	94	11	77	4	4	1,035	3	4.03	2.77	1.45	0.40	10.8	7.4	1.22	.261	3.38	79	3.76	98	8.21	1.5
4	Heinie Meine H. Meine	2.98	1931	PIT	36	19	13	.594	35	58	22	3	0	284.0	278	94	121	9	87	7	1	1,202	4	1.84	2.76	0.67	0.29	4.8	7.2	1.29	.258	3.83	78	4.11	104	8.81	-4.9
5	Syl Johnson S. Johnson	3.00	1931	SLN	32	11	9	.550	24	82	12	2	2	186.0	186	62	73	9	29	2	6	766	3	3.97	1.40	2.83	0.44	10.7	3.8	1.16	.275	3.53	77	3.36	83	9.00	14.1
6	Freddie Fitzsimmons F. Fitzsimmons	3.05	1931	NYG	35	18	11	.621	33	78	19	4	0	253.2	242	86	111	16	62	0	1	1,045	5	2.77	2.20	1.26	0.57	7.5	5.9	1.20	.254	3.94	81	4.05	104	8.59	-5.5
7	Tom Zachary T. Zachary	3.10	1931	BSN	33	11	15	.423	28	64	16	3	2	229.0	243	79	87	8	53	1	3	963	4	2.52	2.08	1.21	0.31	6.6	5.5	1.29	.281	3.42	84	3.72	97	9.55	2.6
8	Ray Benge R. Benge	3.17	1931	PHN	38	14	18	.438	31	117	16	2	2	247.0	251	87	107	12	61	5	7	1,044	2	4.26	2.22	1.92	0.44	11.2	5.8	1.26	.282	3.90	73	3.60	80	9.15	23.9
9	Watty Clark W. Clark	3.20	1931	BKN	34	14	10	.583	28	96	16	3	1	233.1	243	83	86	4	52	1	2	981	3	3.70	2.01	1.85	0.15	9.8	5.3	1.26	.289	3.32	85	3.19	81	9.37	18.9
10	Bob Smith B. Smith	3.22	1931	CHC	36	15	12	.556	29	63	18	2	2	240.1	239	86	101	10	62	1	5	1,004	1	2.36	2.32	1.02	0.37	6.3	6.2	1.25	.264	3.78	83	3.92	98	8.95	2.4
11	Larry French L. French	3.26	1931	PIT	39	15	13	.536	33	73	20	1	1	275.2	301	100	127	9	70	1	4	1,170	5	2.38	2.29	1.04	0.29	6.2	6.0	1.35	.287	4.15	85	3.78	95	9.83	5.5
12	Bill Hallahan B. Hallahan	3.29	1931	SLN	37	19	9	.679	30	159	16	3	3	248.2	242	91	102	10	112	1	6	1,061	11	5.75	4.05	1.42	0.36	15.0	10.6	1.42	.298	3.69	84	3.72	92	8.76	9.1
13	Ray Kremer R. Kremer	3.33	1931	PIT	30	11	15	.423	30	58	15	1	0	230.0	246	85	110	6	65	5	0	994	3	2.27	2.54	0.89	0.23	5.8	6.5	1.35	.279	4.30	87	3.86	97	9.63	2.5
14	Larry Benton L. Benton	3.35	1931	CIN	38	10	15	.400	23	35	12	2	2	204.1	240	76	98	6	53	1	11	878	4	1.54	2.33	0.66	0.26	4.0	6.0	1.43	.299	4.32	90	3.94	103	10.57	-3.1
15	Paul Derringer P. Derringer	3.36	1931	SLN	35	18	8	.692	23	134	15	4	2	211.2	225	79	88	9	65	4	10	901	6	5.70	2.76	2.06	0.38	14.9	7.2	1.37	.313	3.74	86	3.38	84	9.57	15.7
16	Dazzy Vance D. Vance	3.38	1931	BKN	30	11	13	.458	29	150	12	2	0	218.2	221	82	99	12	53	0	1	918	1	6.17	2.18	2.83	0.49	16.3	5.8	1.25	.297	4.07	89	3.18	81	9.10	18
17	Glenn Spencer G. Spencer	3.42	1931	PIT	38	11	12	.478	18	51	11	1	3	186.2	180	71	83	8	65	5	14	783	6	2.46	3.13	0.78	0.39	6.5	8.3	1.31	.263	4.00	89	4.25	107	8.68	-6.1
18	Charlie Root C. Root	3.48	1931	CHC	39	17	14	.548	31	131	19	3	2	251.0	240	97	109	7	71	7	6	1,043	1	4.70	2.55	1.85	0.25	12.6	6.8	1.24	.282	3.91	90	3.36	84	8.61	17.9
19	Clise Dudley C. Dudley	3.52	1931	PHN	30	8	14	.364	24	50	8	0	0	179.0	206	70	95	10	56	6	3	793	7	2.51	2.82	0.89	0.50	6.3	7.1	1.46	.292	4.78	81	4.32	96	10.36	4.5
20	Flint Rhem F. Rhem	3.56	1931	SLN	33	11	10	.524	26	72	10	2	1	207.1	214	82	100	17	60	3	6	882	3	3.13	2.60	1.20	0.74	8.2	6.8	1.32	.270	4.34	91	4.40	109	9.29	-7.9
21	Red Lucas R. Lucas	3.59	1931	CIN	29	14	13	.519	29	56	24	3	0	238.0	261	95	110	10	39	0	0	985	0	2.12	1.47	1.44	0.38	5.7	4.0	1.26	.285	4.16	97	3.68	96	9.87	3.7
22	Ben Cantwell B. Cantwell	3.63	1931	BSN	33	7	9	.438	16	32	9	2	2	156.1	160	63	73	4	34	0	8	659	4	1.84	1.96	0.94	0.23	4.9	5.2	1.24	.265	4.20	98	3.69	96	9.21	2.3
23	Burleigh Grimes B. Grimes	3.65	1931	SLN	29	17	9	.654	28	67	17	3	0	212.1	240	86	97	11	59	10	1	914	2	2.84	2.50	1.14	0.47	7.3	6.5	1.41	.299	4.11	93	4.13	102	10.17	-1.8
24	Si Johnson S. Johnson	3.77	1931	CIN	42	11	19	.367	33	95	14	0	0	262.1	273	110	131	5	74	6	3	1,113	2	3.26	2.54	1.28	0.17	8.5	6.6	1.32	.287	4.49	102	3.55	92	9.37	8
25	Phil Collins P. Collins	3.86	1931	PHN	42	12	16	.429	27	73	16	2	4	240.1	268	103	126	14	83	5	10	1,055	1	2.73	3.11	0.88	0.52	6.9	7.9	1.46	.289	4.72	89	4.36	97	10.04	5.1