most wins by a pitcher before june in a season

Before June 1, 2024, Jack Chesbro 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	H/9
1	Jack Chesbro J. Chesbro	41	1904	NYH	12	.774	55	51	1.82	240	48	6	0	454.2	338		128	4	88	7	3			9	4.75	1.74	2.73	0.08		5.2	0.94	.249	2.53	6.69
2	Ed Walsh E. Walsh	40	1908	CWS	15	.727	66	49		271	42	11	6	464.1	343		111	2	56	11	16		1,774	10	5.25	1.09	4.84	0.04	15.3	3.2	0.86	.238	2.15	6.65
3	Christy Mathewson C. Mathewson	37	1908	NYG	11	.771	56	44		261	34	11	3	391.0	282		85	5	42	3	10		1,485	2	6.01	0.97	6.21	0.12	17.6	2.8	0.83	.236	1.96	6.49
4	Walter Johnson W. Johnson	36	1913	WSH	7	.837	48	36	1.14	243	29	11	2	346.1	232		56	9	40	8	11			2	6.31	1.04	6.08	0.23		3.1	0.79	.226	1.46	6.03
5	Joe McGinnity J. McGinnity	35	1904	NYG	8	.814	51	44		147	38	9	3	408.1	308		103	8	87	13	7		1,613	2	3.24	1.92	1.69	0.18	9.1	5.4	0.97	.221	2.27	6.79
6	Joe Wood J. Wood	34	1912	BSA	5	.872	43	38	0.26	258	35	10	1	344.0	266		104	2	83	12	5		1,360	7	6.75	2.17	3.11	0.05	19.0	6.1	1.01	.263	2.72	6.96
7	Grover Alexander G. Alexander	33	1916	PHN	12	.733	48	45	1.55	169	38	16	3	390.0	323		90	6	50	10	3		1,500	3	3.90	1.15	3.38	0.14	11.3	3.3	0.96	.251	2.08	7.45
8	Walter Johnson W. Johnson	33	1912	WSH	12	.733	50	37	0.15	305	34	7	2	369.1	260		89	2	77	16	13			11	7.43	1.88	3.96	0.05		5.4	0.91	.251	2.17	6.34
9	Christy Mathewson C. Mathewson	33	1904	NYG	12	.733	48	46		211	33	4	0	366.1	306		120	7	78	4	2		1,469	10	5.18	1.92	2.71	0.17	14.4	5.3	1.05	.256	2.95	7.52
10	Cy Young C. Young	33	1901	BSA	10	.767	43	41	1.62	160	38	5	0	371.2	324		112	6	39	8	2			1	3.87	0.94	4.10	0.15		2.9	0.98	.280	2.71	7.85
11	Cy Young C. Young	32	1902	BSA	11	.744	45	43	2.15	165	41	3	0	385.2	350	92	136	6	53	11	1			3	3.85	1.24	3.11	0.14		3.6	1.04	.279	3.17	8.17
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	6.46
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		1,159	2	5.46	1.93	2.82	0.31	15.1	5.3	1.08	.262	2.62	7.76
14	Jim Bagby J. Bagby	31	1920	CLE	12	.721	48	38	2.89	75	30	3	0	339.2	339		122	9	82	5	9		1,405	6	1.99	2.17	0.91	0.24	5.3	5.8	1.24	.267	3.23	8.98
15	Grover Alexander G. Alexander	31	1915	PHN	10	.756	49	42	1.22	241	36	12	4	376.1	253	51	86	3	64	9	7		1,435	2	5.76	1.53	3.77	0.07	16.8	4.5	0.84	.224	2.06	6.05
16	Jack Coombs J. Coombs	31	1910	PHA	9	.775	45	38		226	35	13	1	352.2	249		74	0	119	7	6			10	5.77	3.04	1.90	0.00		8.6	1.04	.241	1.89	6.35
17	Christy Mathewson C. Mathewson	31	1905	NYG	9	.775	43	37		212	32	8	3	339.2	252		85	4	63	1	6			6	5.62	1.67	3.37	0.11		4.9	0.93	.245	2.25	6.68
18	Joe McGinnity J. McGinnity	31	1903	NYG	20	.608	55	48		171	44	3	2	433.0	391		162	4	112	15	6		1,786	5	3.55	2.33	1.53	0.08	9.6	6.3	1.16	.261	3.37	8.13
19	Dizzy Dean D. Dean	30	1934	SLN	7	.811	50	33	2.66	195	24	7	7	311.2	288	92	110	14	73	6	14		1,291	2	5.63	2.11	2.67	0.40	15.1	5.7	1.16	.273	3.18	8.32
20	Grover Alexander G. Alexander	30	1917	PHN	13	.698	45	44	1.84	200	35	8	0	387.0	336		107	4	56	6	0		1,529	2	4.65	1.30	3.57	0.09	13.1	3.7	1.01	.263	2.49	7.81
21	Christy Mathewson C. Mathewson	30	1903	NYG	13	.698	45	42		267	37	3	1	367.0	322		136	4	102	10	3		1,502	18	6.55	2.50	2.62	0.10	17.8	6.8	1.16	.284	3.34	7.90
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		1,270	4	5.39	2.94	1.83	0.17	14.7	8.0	1.17	.265	2.71	7.61
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	3	5		1,199	1	3.23	1.44	2.24	0.15	9.2	4.1	0.99	.243	2.26	7.51
24	Claude Hendrix C. Hendrix	29	1914	CHF	11	.725	49	37	1.69	189	34	6	5	362.0	262		91	6	83	6	12			7	4.70	2.06	2.28	0.15		7.0	0.95	.285	2.26	6.51
25	George Mullin G. Mullin	29	1909	DET	8	.784	40	35		131	29	3	1	304.2	259		96	1	79	9	5			5	3.87	2.33	1.66	0.03		6.4	1.11	.257	2.84	7.65