who has the most wins in a season as a pitcher in the modern era

Since 1900, Jack Chesbro has won the most games in a season, with 41 wins in 1904.

	NAME	W	SEASON	TM	L	W%	G	GS	ERA	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Jack Chesbro J. Chesbro	41	1904	NYH	12	.774	55	51	1.82	239	48	6	0	454.2	338	92	128	4	88	7	3		1,720	9	4.73	1.74	2.72	0.08	13.9	5.1	0.94	.242	2.53	65	2.11	78	6.69	32.5
2	Ed Walsh E. Walsh	40	1908	CWS	15	.727	66	49	1.42	269	42	11	6	464.0	343	73	111	2	56	9	16		1,755	10	5.22	1.09	4.80	0.04	15.3	3.2	0.86	.240	2.15	63	1.42	67	6.65	34.2
3	Christy Mathewson C. Mathewson	37	1908	NYG	11	.771	56	44	1.43	259	34	11	5	390.2	281	62	85	5	42	3	9		1,469	2	5.97	0.97	6.17	0.12	17.6	2.9	0.83	.238	1.96	61	1.29	52	6.47	52.4
4	Walter Johnson W. Johnson	36	1913	WSH	7	.837	48	36	1.14	243	29	11	2	346.0	232	44	56	9	38	9	10		1,271	2	6.32	0.99	6.39	0.23	19.1	3.0	0.78	.229	1.46	39	1.90	63	6.03	42.3
5	Joe McGinnity J. McGinnity	35	1904	NYG	8	.814	51	44	1.61	144	38	9	5	408.0	307	73	103	8	86	13	7		1,588	2	3.18	1.90	1.67	0.18	9.1	5.4	0.96	.224	2.27	59	2.70	96	6.77	5.3
6	Joe Wood J. Wood	34	1912	BSA	5	.872	43	38	1.91	258	35	10	1	344.0	267	73	104	2	82	12	5		1,328	7	6.75	2.15	3.15	0.05	19.4	6.2	1.01	.272	2.72	58	2.25	71	6.99	35.1
7	Grover Alexander G. Alexander	33	1916	PHN	12	.733	48	45	1.55	167	38	16	3	389.0	323	67	90	6	50	10	3		1,500	3	3.86	1.16	3.34	0.14	11.1	3.3	0.96	.250	2.08	58	2.12	79	7.47	25.4
8	Walter Johnson W. Johnson	33	1912	WSH	12	.733	50	37	1.39	303	34	7	2	369.0	259	57	89	2	76	16	13		1,413	11	7.39	1.85	3.99	0.05	21.4	5.4	0.91	.253	2.17	42	2.03	63	6.32	49.6
9	Christy Mathewson C. Mathewson	33	1904	NYG	12	.733	48	46	2.03	212	33	4	1	367.2	306	83	120	7	78	4	2		1,437	10	5.19	1.91	2.72	0.17	14.8	5.4	1.04	.263	2.94	75	2.18	78	7.49	25.8
10	Cy Young C. Young	33	1901	BSA	10	.767	43	41	1.62	158	38	5	0	371.1	324	67	112	6	37	7	2		1,440	2	3.83	0.90	4.27	0.15	11.0	2.6	0.97	.258	2.71	44	2.64	72	7.85	42.6
11	Cy Young C. Young	32	1902	BSA	11	.744	45	43	2.15	160	41	3	0	384.2	350	92	136	6	53	13	1		1,506	3	3.74	1.24	3.02	0.14	10.6	3.5	1.05	.270	3.18	60	2.55	74	8.19	37.5
12	Denny McLain D. McLain	31	1968	DET	6	.838	41	41	1.96	280	28	6	0	336.0	241	73	86	31	63	6	0	2	1,288	3	7.50	1.69	4.44	0.83	21.7	4.9	0.90	.231	2.30	64	2.53	79	6.46	24.8
13	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
14	Jim Bagby J. Bagby	31	1920	CLE	12	.721	48	38	2.89	73	30	3	0	339.2	338	109	122	9	79	5	9		1,355	6	1.93	2.09	0.92	0.24	5.4	5.8	1.23	.277	3.23	75	3.41	92	8.96	12
15	Grover Alexander G. Alexander	31	1915	PHN	10	.756	49	42	1.22	241	36	12	3	376.1	253	51	86	3	64	10	7		1,435	2	5.76	1.53	3.77	0.07	16.8	4.5	0.84	.224	2.06	43	1.82	63	6.05	44.1
16	Jack Coombs J. Coombs	31	1910	PHA	9	.775	45	38	1.30	224	35	13	1	353.0	248	51	74	0	115	7	6		1,353	10	5.71	2.93	1.95	0.00	16.6	8.5	1.03	.246	1.89	53	2.09	83	6.32	15.8
17	Christy Mathewson C. Mathewson	31	1905	NYG	9	.775	43	37	1.28	206	32	8	3	338.2	252	48	85	4	64	1	6		1,294	6	5.47	1.70	3.22	0.11	15.9	4.9	0.93	.243	2.26	42	2.03	69	6.70	34.9
18	Joe McGinnity J. McGinnity	31	1903	NYG	20	.608	55	48	2.43	171	44	3	2	434.0	391	117	162	4	109	19	6		1,786	5	3.55	2.26	1.57	0.08	9.6	6.1	1.15	.261	3.36	75	2.97	91	8.11	13
19	Dizzy Dean D. Dean	30	1934	SLN	7	.811	50	33	2.66	195	24	7	7	311.2	288	92	110	14	75	6	14		1,291	2	5.63	2.17	2.60	0.40	15.1	5.8	1.16	.274	3.18	64	3.23	77	8.32	32.6
20	Grover Alexander G. Alexander	30	1917	PHN	13	.698	45	44	1.83	200	34	8	0	388.0	336	79	107	4	56	6	0		1,529	1	4.64	1.30	3.57	0.09	13.1	3.7	1.01	.263	2.48	65	1.84	69	7.79	36.4
21	Christy Mathewson C. Mathewson	30	1903	NYG	13	.698	45	42	2.26	267	37	3	2	366.1	321	92	136	4	100	10	3		1,502	18	6.56	2.46	2.67	0.10	17.8	6.7	1.15	.283	3.34	70	2.34	72	7.89	37
22	Hal Newhouser H. Newhouser	29	1944	DET	9	.763	47	34	2.22	187	25	6	2	312.1	264	77	94	6	102	1	10		1,271	4	5.39	2.94	1.83	0.17	14.7	8.0	1.17	.265	2.71	62	2.58	72	7.61	34.5
23	Eddie Cicotte E. Cicotte	29	1919	CWS	7	.806	40	35	1.82	110	30	5	1	306.2	256	62	77	5	49	2	5		1,176	1	3.23	1.44	2.24	0.15	9.4	4.2	0.99	.249	2.26	57	2.48	79	7.51	22.5
24	Claude Hendrix C. Hendrix	29	1914	CHF	10	.744	49	37	1.69	189	34	6	5	362.0	262	68	91	6	77	5	12		1,371	9	4.70	1.91	2.45	0.15	13.8	5.6	0.94	.234	2.26	56	2.29	83	6.51	17.4
25	George Mullin G. Mullin	29	1909	DET	8	.784	40	35	2.22	124	29	3	1	303.2	258	75	96	1	78	8	5		1,189	5	3.68	2.31	1.59	0.03	10.4	6.6	1.11	.263	2.85	86	2.29	92	7.65	8