most wins in a season by a pitcher since 1978

Since 1978, Bob Welch has won the most games in a season, with 27 wins in 1990.

	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	Bob Welch B. Welch	27	1990	OAK	6	.818	35	35	2.95	127	2	2	0	238.0	214	78	90	26	77	5	0	4	979	2	4.80	2.91	1.65	0.98	13.0	7.9	1.22	.253	3.40	79	4.19	110	8.09	-11.1
2	Steve Stone S. Stone	25	1980	BAL	7	.781	37	37	3.23	149	9	1	0	250.2	224	90	103	22	101	6	0	3	1,048	7	5.35	3.63	1.48	0.79	14.2	9.6	1.30	.262	3.70	83	3.98	101	8.04	-1.1
3	Ron Guidry R. Guidry	25	1978	NYY	3	.893	35	35	1.74	248	16	9	0	273.2	187	53	61	13	72	1	0	1	1,057	7	8.16	2.37	3.44	0.43	23.5	6.8	0.95	.241	2.01	48	2.18	58	6.15	48.5
4	Justin Verlander J. Verlander	24	2011	DET	5	.828	34	34	2.40	250	4	2	0	251.0	174	67	73	24	57	3	0	0	969	7	8.96	2.04	4.39	0.86	25.8	5.9	0.92	.236	2.62	58	2.99	74	6.24	29.4
5	Randy Johnson R. Johnson	24	2002	ARI	5	.828	35	35	2.32	334	8	4	0	260.0	197	67	78	26	71	13	0	1	1,035	3	11.56	2.46	4.70	0.90	32.3	6.9	1.03	.289	2.70	54	2.65	61	6.82	47
6	John Smoltz J. Smoltz	24	1996	ATL	8	.750	35	35	2.94	276	6	2	0	253.2	199	83	93	19	55	2	0	3	995	10	9.79	1.95	5.02	0.67	27.7	5.5	1.00	.280	3.30	69	2.63	60	7.06	48.4
7	Frank Viola F. Viola	24	1988	MIN	7	.774	35	35	2.64	193	7	2	0	255.1	236	75	80	20	54	3	0	2	1,031	5	6.80	1.90	3.57	0.70	18.7	5.2	1.14	.284	2.82	64	2.94	74	8.32	28.7
8	Roger Clemens R. Clemens	24	1986	BOS	4	.857	33	33	2.48	238	10	1	0	254.0	179	70	77	21	67	4	0	0	997	11	8.43	2.37	3.55	0.74	23.9	6.7	0.97	.237	2.73	58	2.80	69	6.34	36.3
9	Dwight Gooden D. Gooden	24	1985	NYM	4	.857	35	35	1.53	268	16	8	0	276.2	198	47	51	13	69	2	0	4	1,065	6	8.72	2.24	3.88	0.42	25.2	6.5	0.97	.259	1.66	44	2.12	59	6.44	45.6
10	LaMarr Hoyt L. Hoyt	24	1983	CWS	10	.706	36	36	3.66	148	11	1	0	260.2	236	106	115	27	31	1	0	4	1,034	1	5.11	1.07	4.77	0.93	14.3	3.0	1.02	.253	3.97	88	3.32	82	8.15	20.5
11	Steve Carlton S. Carlton	24	1980	PHI	9	.727	38	38	2.34	286	13	3	0	304.0	243	79	87	15	90	2	0	12	1,228	17	8.47	2.66	3.18	0.44	23.3	7.3	1.10	.273	2.58	64	2.41	66	7.19	42.3
12	Curt Schilling C. Schilling	23	2002	ARI	7	.767	36	35	3.23	316	5	1	0	259.1	218	93	95	29	33	3	0	1	1,017	6	10.97	1.15	9.58	1.01	31.1	3.2	0.97	.297	3.30	75	2.39	55	7.57	54.3
13	Barry Zito B. Zito	23	2002	OAK	5	.821	35	35	2.75	182	1	0	0	229.1	182	70	79	24	78	9	0	2	939	2	7.14	3.06	2.33	0.94	19.4	8.3	1.13	.245	3.10	63	3.86	89	7.14	12.6
14	Pedro Martinez P. Martinez	23	1999	BOS	4	.852	31	29	2.07	313	5	1	0	213.1	160	49	56	9	37	9	1	1	835	6	13.20	1.56	8.46	0.38	37.5	4.4	0.92	.323	2.36	42	1.38	30	6.75	79.4
15	Bret Saberhagen B. Saberhagen	23	1989	KCR	6	.793	36	35	2.16	193	12	4	0	262.1	209	63	74	13	43	2	0	6	1,021	8	6.62	1.48	4.49	0.45	18.9	4.2	0.96	.255	2.54	56	2.44	66	7.17	36.9
16	Orel Hershiser O. Hershiser	23	1988	LAD	8	.742	35	34	2.26	178	15	8	1	267.0	208	67	73	18	73	4	1	10	1,068	6	6.00	2.46	2.44	0.61	16.7	6.8	1.05	.239	2.46	68	3.17	93	7.01	6.7
17	Danny Jackson D. Jackson	23	1988	CIN	8	.742	35	35	2.73	161	15	6	0	260.2	206	79	86	13	71	2	0	6	1,034	5	5.56	2.45	2.27	0.45	15.6	6.9	1.06	.245	2.97	77	3.01	83	7.11	18.1
18	Steve Carlton S. Carlton	23	1982	PHI	11	.676	38	38	3.10	286	19	6	0	295.2	253	102	114	17	86	1	0	5	1,193	9	8.71	2.62	3.33	0.52	24.0	7.2	1.15	.294	3.47	85	2.40	67	7.70	38.3
19	Mike Flanagan M. Flanagan	23	1979	BAL	9	.719	39	38	3.08	190	16	5	0	265.2	245	91	107	23	70	3	0	1	1,085	6	6.44	2.37	2.71	0.78	17.5	6.5	1.19	.278	3.62	77	3.24	79	8.30	25.6
20	Rick Porcello R. Porcello	22	2016	BOS	4	.846	33	33	3.15	189	3	0	0	223.0	193	78	85	23	32	13	0	0	890	3	7.63	1.29	5.91	0.93	21.2	3.6	1.01	.269	3.43	71	3.39	81	7.79	20.1
21	Jake Arrieta J. Arrieta	22	2015	CHC	6	.786	33	33	1.77	236	4	3	0	229.0	150	45	52	10	48	6	0	2	870	6	9.28	1.89	4.92	0.39	27.1	5.5	0.86	.246	2.04	45	2.34	60	5.90	39
22	Cliff Lee C. Lee	22	2008	CLE	3	.880	31	31	2.54	170	4	2	0	223.1	214	63	68	12	34	5	0	1	891	4	6.85	1.37	5.00	0.48	19.1	3.8	1.11	.301	2.74	59	2.82	67	8.62	35.4
23	Brandon Webb B. Webb	22	2008	ARI	7	.759	34	34	3.30	183	3	1	0	226.2	206	83	95	13	65	12	0	5	944	8	7.27	2.58	2.82	0.52	19.4	6.9	1.20	.288	3.77	73	3.27	74	8.18	28
24	Dontrelle Willis D. Willis	22	2005	FLA	10	.688	34	34	2.63	170	7	5	0	236.1	213	69	79	11	55	8	0	3	960	2	6.47	2.09	3.09	0.42	17.7	5.7	1.13	.282	3.01	64	2.98	71	8.11	31.6
25	Roy Halladay R. Halladay	22	2003	TOR	7	.759	36	36	3.25	204	9	2	0	266.0	253	96	111	26	32	9	0	1	1,071	6	6.90	1.08	6.38	0.88	19.0	3.0	1.07	.284	3.76	70	3.22	71	8.56	38.6