Lefty Grove won the most games in 1931, with 31 wins.

	NAME	W	SEASON	TM	L	W%	G	GS	ERA	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	Lefty Grove L. Grove	31	1931	PHA	4	.886	41	30	2.06	175	27	4	5	288.2	249	66	84	10	62	1	10	1,160	2	5.46	1.93	2.82	0.31	15.1	5.3	1.08	.262	2.62	47	3.01	70	7.76	40.8
2	Wes Ferrell W. Ferrell	22	1931	CLE	12	.647	40	35	3.75	123	27	2	3	276.1	276	115	134	9	130	3	4	1,227	3	4.01	4.23	0.95	0.29	10.0	10.6	1.47	.278	4.36	81	4.09	92	8.99	11.7
3	George Earnshaw G. Earnshaw	21	1931	PHA	7	.750	43	30	3.67	152	23	3	6	281.2	255	115	130	16	75	3	11	1,174	5	4.86	2.40	2.03	0.51	12.9	6.4	1.17	.258	4.15	83	3.60	84	8.15	21.3
4	Lefty Gomez L. Gomez	21	1931	NYY	9	.700	40	26	2.67	150	17	1	3	243.0	206	72	88	7	85	4	10	1,013	1	5.56	3.15	1.76	0.26	14.8	8.4	1.20	.259	3.26	64	3.35	83	7.63	18.2
5	Rube Walberg R. Walberg	20	1931	PHA	12	.625	44	35	3.74	106	19	1	4	291.0	298	121	133	16	109	0	8	1,248	3	3.28	3.37	0.97	0.49	8.5	8.7	1.40	.277	4.11	85	4.22	99	9.22	2.1
6	Jumbo Elliott J. Elliott	19	1931	PHN	14	.576	52	30	4.27	99	12	2	5	249.0	288	118	138	15	83	4	16	1,098	1	3.58	3.00	1.19	0.54	9.0	7.6	1.49	.304	4.99	99	4.15	93	10.41	10.5
7	Bill Hallahan B. Hallahan	19	1931	SLN	9	.679	37	30	3.29	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
8	Heinie Meine H. Meine	19	1931	PIT	13	.594	36	35	2.98	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
9	Ed Brandt E. Brandt	18	1931	BSN	11	.621	33	29	2.92	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
10	Alvin Crowder A. Crowder	18	1931	WSH	11	.621	44	26	3.88	85	13	1	2	234.1	255	101	117	14	72	1	10	1,009	4	3.26	2.77	1.18	0.54	8.4	7.1	1.40	.288	4.49	90	4.10	99	9.79	1.1
11	Paul Derringer P. Derringer	18	1931	SLN	8	.692	35	23	3.36	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
12	Freddie Fitzsimmons F. Fitzsimmons	18	1931	NYG	11	.621	35	33	3.05	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
13	Burleigh Grimes B. Grimes	17	1931	SLN	9	.654	29	28	3.65	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
14	Charlie Root C. Root	17	1931	CHC	14	.548	39	31	3.48	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
15	Guy Bush G. Bush	16	1931	CHC	8	.667	39	24	4.49	54	14	1	3	180.1	190	90	104	9	66	2	9	790	6	2.70	3.29	0.82	0.45	6.8	8.4	1.42	.275	5.19	116	4.29	107	9.48	-5.8
16	Danny MacFayden D. MacFayden	16	1931	BSA	12	.571	35	32	4.02	74	17	2	0	230.2	263	103	121	4	79	7	2	1,035	1	2.89	3.08	0.94	0.16	7.1	7.6	1.48	.297	4.72	94	3.81	92	10.26	8.5
17	Pat Malone P. Malone	16	1931	CHC	9	.640	36	30	3.90	112	12	2	0	228.1	229	99	115	9	88	4	4	989	5	4.41	3.47	1.27	0.35	11.3	8.9	1.39	.284	4.53	101	3.85	96	9.03	3.8
18	Firpo Marberry F. Marberry	16	1931	WSH	4	.800	45	25	3.45	88	11	1	8	219.0	211	84	92	13	63	3	14	913	3	3.62	2.59	1.40	0.53	9.6	6.9	1.25	.265	3.78	80	3.98	96	8.67	3.8
19	Red Ruffing R. Ruffing	16	1931	NYY	14	.533	37	30	4.41	132	19	1	2	237.0	240	116	130	11	87	6	5	1,042	1	5.01	3.30	1.52	0.42	12.7	8.3	1.38	.284	4.94	106	3.78	94	9.11	5.8
20	Bill Walker B. Walker	16	1931	NYG	9	.640	37	28	2.26	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
21	Lloyd Brown L. Brown	15	1931	WSH	14	.517	42	32	3.20	79	15	1	0	258.2	256	92	120	12	79	0	8	1,091	3	2.75	2.75	1.00	0.42	7.2	7.2	1.30	.265	4.18	75	4.02	97	8.91	3.5
22	Larry French L. French	15	1931	PIT	13	.536	39	33	3.26	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
23	Willis Hudlin W. Hudlin	15	1931	CLE	14	.517	44	34	4.60	83	15	1	4	254.1	313	130	155	14	88	1	7	1,139	4	2.94	3.11	0.94	0.50	7.3	7.7	1.58	.314	5.48	100	4.23	95	11.08	7.1
24	Roy Mahaffey R. Mahaffey	15	1931	PHA	4	.789	30	20	4.21	59	8	0	2	162.1	161	76	87	9	82	3	5	714	4	3.27	4.55	0.72	0.50	8.3	11.5	1.50	.271	4.82	95	4.68	109	8.93	-6.9
25	Bob Smith B. Smith	15	1931	CHC	12	.556	36	29	3.22	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