most career wins prior to age 30 live-ball era

Since 1920, Jim Bagby has won the most games by a 30-year-old pitcher, with 31 wins.

Interpreted as:

most career regular-season wins by a player prior to age 30 live-ball era

	NAME	W	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	Jim Bagby J. Bagby	31	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
2	Lefty Grove L. Grove	28	5	.848	50	32	2.54	209	22	2	9	290.2	272	82	101	8	61	5	17		1,192	2	6.47	1.89	3.43	0.25	17.5	5.1	1.15	.290	3.13	8.42
3	Sandy Koufax S. Koufax	27	9	.750	41	41	1.73	317	27	5	0	323.0	241	62	74	19	77	0	0	4	1,274	7	8.83	2.15	4.12	0.53	24.9	6.0	0.98	.258	2.06	6.72
4	Bucky Walters B. Walters	27	10	.730	38	36	2.20	133	31	2	0	314.2	243	77	94	15	108	6	2		1,264	8	3.80	3.09	1.23	0.43	10.5	8.5	1.12	.228	2.69	6.95
5	Juan Marichal J. Marichal	26	9	.743	38	38	2.43	217	30	5	0	325.2	295	88	106	21	46	6	0	9	1,307	8	6.00	1.27	4.72	0.58	16.6	3.5	1.05	.269	2.93	8.15
6	Mickey Lolich M. Lolich	25	13	.658	45	45	3.18	301	25	4	0	370.1	342	131	141	38	100	8	0	2	1,533	8	7.32	2.43	3.01	0.92	19.6	6.5	1.19	.280	3.43	8.31
7	Larry Benton L. Benton	25	9	.735	42	36	2.73	90	28	2	4	310.1	299	94	106	14	71	0	4		1,264	6	2.61	2.06	1.27	0.41	7.1	5.6	1.19	.262	3.07	8.67
8	Wilbur Wood W. Wood	24	17	.585	49	49	2.51	193	20	8	0	376.2	325	105	119	28	74	7	0	5	1,490	11	4.61	1.77	2.61	0.67	13.0	5.0	1.06	.250	2.84	7.77
9	Carl Hubbell C. Hubbell	24	12	.667	45	35	1.82	132	24	9	7	316.2	275	64	75	10	43	3	10		1,246	1	3.75	1.22	3.07	0.28	10.6	3.5	1.00	.250	2.13	7.82
10	CC Sabathia	23	8	.742	35	35	2.88	221	2	1	0	253.1	230	81	92	13	67	8	0	5	1,043	3	7.85	2.38	3.30	0.46	21.2	6.4	1.17	.296	3.27	8.17
11	Phil Niekro P. Niekro	23	13	.639	40	35	2.56	193	21	4	1	284.1	235	81	93	21	57	5	4	7	1,143	17	6.11	1.80	3.39	0.66	16.9	5.0	1.03	.247	2.94	7.44
12	Johnny Sain J. Sain	23	15	.605	41	37	2.64	136	27	4	1	306.2	292	90	102	20	80	4	4		1,281	2	3.99	2.35	1.70	0.59	10.6	6.2	1.21	.261	2.99	8.57
13	Red Barrett R. Barrett	23	12	.657	45	34	3.00	76	24	3	2	284.2	287	95	106	17	54	2	10		1,176	1	2.40	1.71	1.41	0.54	6.5	4.6	1.20	.263	3.35	9.07
14	Burleigh Grimes B. Grimes	23	14	.622	39	38	3.77	130	34	1	1	327.1	361	137	165	12	92	8	1		1,407	7	3.57	2.53	1.41	0.33	9.2	6.5	1.38	.300	4.54	9.93
15	Wilbur Cooper W. Cooper	23	14	.622	41	36	3.18	129	27	4	0	294.2	330	104	130	13	61	7	3		1,251	4	3.94	1.86	2.11	0.40	10.3	4.9	1.33	.305	3.97	10.08
16	Jim Palmer J. Palmer	22	13	.629	40	40	2.51	159	23	6	0	315.0	255	88	101	20	84	8	0	5	1,256	5	4.54	2.40	1.89	0.57	12.7	6.7	1.08	.239	2.89	7.29
17	Tom Seaver T. Seaver	22	9	.710	36	36	2.38	243	15	5	0	280.1	217	74	81	11	88	4	0	6	1,115	7	7.80	2.83	2.76	0.35	21.8	7.9	1.09	.268	2.60	6.97
18	Don Newcombe D. Newcombe	22	9	.710	36	35	2.94	113	18	6	0	266.0	222	87	95	33	41	1	1	8	1,042	2	3.82	1.39	2.76	1.12	10.8	3.9	0.99	.221	3.21	7.51
19	Warren Spahn W. Spahn	22	14	.611	40	37	2.90	163	27	7	0	316.1	290	102	114	21	103	1	3		1,310	7	4.64	2.93	1.58	0.60	12.4	7.9	1.24	.263	3.24	8.25
20	Larry Jansen L. Jansen	22	15	.595	41	37	3.39	149	20	4	0	289.2	271	109	122	32	52	3	4		1,171	2	4.63	1.62	2.87	0.99	12.7	4.4	1.12	.256	3.79	8.42
21	George Earnshaw G. Earnshaw	22	13	.629	49	39	4.44	194	20	3	2	296.0	300	146	162	20	140	2	6		1,302	10	5.90	4.26	1.39	0.61	14.9	10.8	1.49	.296	4.93	9.12
22	Chris Carpenter C. Carpenter	21	5	.808	34	34	2.57	226	6	3	0	248.2	205	71	77	20	52	5	0	1	978	3	8.18	1.88	4.35	0.72	23.1	5.3	1.03	.274	2.79	7.42
23	Mike Torrez M. Torrez	21	13	.618	37	37	3.16	121	21	5	0	276.0	241	97	104	20	89	7	0	1	1,134	4	3.95	2.90	1.36	0.65	10.7	7.8	1.20	.246	3.39	7.86
24	Bob Gibson B. Gibson	21	12	.636	35	35	2.44	225	20	5	0	280.1	210	76	90	20	78	5	0	5	1,119	12	7.22	2.50	2.88	0.64	20.1	7.0	1.03	.240	2.89	6.74
25	Vic Raschi V. Raschi	21	10	.677	38	37	3.34	124	21	3	0	274.2	247	102	120	16	138	6	0		1,185	10	4.06	4.52	0.90	0.52	10.5	11.6	1.40	.256	3.93	8.09