players with the most wins as a pitcher in a season with the oakland a's since 1920

Since 1920, Bob Welch has won the most games for the Oakland Athletics 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	Catfish Hunter C. Hunter	25	1974	OAK	12	.676	41	41	2.49	143	23	6	0	318.1	268	88	97	25	46	4	0	2	1,240	1	4.04	1.30	3.11	0.71	11.5	3.7	0.99	.238	2.74	73	3.16	86	7.58	17.6
3	Vida Blue V. Blue	24	1971	OAK	8	.750	39	39	1.82	301	24	8	0	312.0	209	63	73	19	88	4	0	3	1,207	10	8.68	2.54	3.42	0.55	24.9	7.3	0.95	.239	2.11	56	2.19	66	6.03	41.4
4	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
5	Dave Stewart D. Stewart	22	1990	OAK	11	.667	36	36	2.56	166	11	4	0	267.0	226	76	84	16	83	5	0	1	1,088	8	5.60	2.80	2.00	0.54	15.3	7.6	1.16	.257	2.83	69	3.32	88	7.62	13.9
6	Mike Norris M. Norris	22	1980	OAK	9	.710	33	33	2.53	180	24	1	0	284.1	215	80	88	18	83	6	0	2	1,135	9	5.70	2.63	2.17	0.57	15.9	7.3	1.05	.232	2.79	66	3.24	81	6.81	23.7
7	Vida Blue V. Blue	22	1975	OAK	11	.667	39	38	3.01	189	13	2	1	278.0	243	93	103	21	99	5	1	4	1,153	4	6.12	3.21	1.91	0.68	16.4	8.6	1.23	.265	3.33	85	3.32	86	7.87	16.2
8	Mark Mulder M. Mulder	21	2001	OAK	8	.724	34	34	3.45	153	6	4	0	229.1	214	88	92	16	51	5	0	4	927	4	6.00	2.00	3.00	0.63	16.5	5.5	1.16	.282	3.61	79	3.35	76	8.40	27.5
9	Dave Stewart D. Stewart	21	1989	OAK	9	.700	36	36	3.32	155	8	0	0	257.2	260	95	105	23	69	6	0	0	1,081	13	5.41	2.41	2.25	0.80	14.3	6.4	1.28	.286	3.67	91	3.58	98	9.08	1.2
10	Dave Stewart D. Stewart	21	1988	OAK	12	.636	37	37	3.23	192	14	2	0	275.2	240	99	111	14	110	3	0	5	1,156	14	6.27	3.59	1.75	0.46	16.6	9.5	1.27	.270	3.62	87	3.26	87	7.84	15.4
11	Ken Holtzman K. Holtzman	21	1973	OAK	13	.618	40	40	2.97	157	16	4	0	297.1	275	98	109	22	66	4	0	5	1,210	12	4.75	2.00	2.38	0.67	13.0	5.5	1.15	.263	3.30	83	3.17	89	8.32	13.1
12	Catfish Hunter C. Hunter	21	1973	OAK	5	.808	36	36	3.34	124	11	3	0	256.1	222	95	105	39	69	1	0	1	1,040	2	4.35	2.42	1.80	1.37	11.9	6.6	1.14	.227	3.69	93	4.39	123	7.79	-25.6
13	Catfish Hunter C. Hunter	21	1972	OAK	7	.750	38	37	2.04	191	16	5	0	295.1	200	67	74	21	70	3	1	6	1,148	3	5.82	2.13	2.73	0.64	16.6	6.1	0.91	.207	2.26	70	2.77	91	6.09	8.5
14	Catfish Hunter C. Hunter	21	1971	OAK	11	.656	37	37	2.96	181	16	4	0	273.2	225	90	103	27	80	4	0	7	1,109	2	5.95	2.63	2.26	0.89	16.3	7.2	1.11	.242	3.39	91	3.33	100	7.40	-0.4
15	Tim Hudson T. Hudson	20	2000	OAK	6	.769	32	32	4.14	169	2	2	0	202.1	169	93	100	24	82	7	0	5	847	7	7.52	3.65	2.06	1.07	20.0	9.7	1.24	.257	4.45	86	4.32	90	7.52	10.3
16	Dave Stewart D. Stewart	20	1987	OAK	13	.606	37	37	3.68	205	8	1	0	261.1	224	107	121	24	105	6	0	2	1,103	11	7.06	3.62	1.95	0.83	18.6	9.5	1.26	.262	4.17	87	3.76	87	7.71	16.5
17	Vida Blue V. Blue	20	1973	OAK	9	.690	37	37	3.28	158	13	4	0	263.2	214	96	108	26	105	4	0	2	1,083	15	5.39	3.58	1.50	0.89	14.6	9.7	1.21	.238	3.69	91	3.88	109	7.30	-10.6
18	Mark Mulder M. Mulder	19	2002	OAK	7	.731	30	30	3.47	159	2	1	0	207.1	182	80	88	21	55	11	0	3	862	7	6.90	2.39	2.89	0.91	18.4	6.4	1.14	.261	3.82	79	3.69	85	7.90	15.4
19	Storm Davis S. Davis	19	1989	OAK	7	.731	31	31	4.36	91	1	0	0	169.1	187	82	91	19	68	3	0	1	733	8	4.84	3.61	1.34	1.01	12.4	9.3	1.51	.304	4.84	119	4.40	121	9.94	-15.1
20	Mike Moore M. Moore	19	1989	OAK	11	.633	35	35	2.61	172	6	3	0	241.2	193	70	82	14	83	2	0	1	976	17	6.41	3.09	2.07	0.52	17.6	8.5	1.14	.254	3.05	71	3.14	86	7.19	13.6
21	Rick Langford R. Langford	19	1980	OAK	12	.613	35	33	3.26	102	28	2	0	290.0	276	105	119	29	64	1	2	6	1,166	7	3.17	1.99	1.59	0.90	8.7	5.5	1.17	.255	3.69	85	4.01	101	8.57	-1
22	Ken Holtzman K. Holtzman	19	1974	OAK	17	.528	39	38	3.07	117	9	3	0	255.1	273	87	111	14	51	3	0	3	1,073	5	4.12	1.80	2.29	0.49	10.9	4.8	1.27	.292	3.91	90	3.00	82	9.62	18.7
23	Ken Holtzman K. Holtzman	19	1972	OAK	11	.633	39	37	2.51	134	16	4	0	265.1	232	74	83	23	52	4	0	6	1,058	4	4.55	1.76	2.58	0.78	12.7	4.9	1.07	.247	2.82	86	3.14	104	7.87	-4.1
24	Bartolo Colon B. Colon	18	2013	OAK	6	.750	30	30	2.65	117	3	3	0	190.1	193	56	60	14	29	0	0	0	769	1	5.53	1.37	4.03	0.66	15.2	3.8	1.17	.294	2.84	68	3.23	83	9.13	14
25	Trevor Cahill T. Cahill	18	2010	OAK	8	.692	30	30	2.97	118	1	1	0	196.2	155	65	73	19	63	6	0	1	783	2	5.40	2.88	1.87	0.87	15.1	8.0	1.11	.236	3.34	74	4.18	102	7.09	-2.3