which athletics pitcher has the highest win percentage with a minimum of 20 decisions since 1980

Since 1980, Mike Fiers has the best win percentage for the Oakland Athletics with 20+ decisions, at .703.

	NAME	W%	DEC	W	L	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	Mike Fiers M. Fiers	.703	37	26	11	56	55	4.12	220	1	1	0	306.0	291	140	143	55	84	16	0	0	1,268	16	6.47	2.47	2.62	1.62	17.4	6.6	1.23	.264	4.21	96	5.07	116	8.56	-24.8
2	Tim Hudson T. Hudson	.702	131	92	39	183	183	3.30	899	16	8	0	1240.2	1,134	455	509	94	382	47	0	33	5,150	39	6.52	2.77	2.35	0.68	17.5	7.4	1.22	.279	3.69	73	3.62	80	8.23	127
3	Yusmeiro Petit Y. Petit	.688	32	22	10	258	0	3.07	201	0	0	2	275.2	221	94	96	39	45	1	34	5	1,077	4	6.56	1.47	4.47	1.27	18.7	4.2	0.96	.230	3.13	73	4.06	96	7.22	5.5
4	Todd Stottlemyre T. Stottlemyre	.667	21	14	7	31	31	4.55	205	2	0	0	209.2	228	106	117	26	80	6	0	7	920	11	8.80	3.43	2.56	1.12	22.3	8.7	1.47	.335	5.02	100	3.98	86	9.79	15.1
5	Mark Mulder M. Mulder	.659	123	81	42	150	150	3.92	668	22	8	0	1003.0	990	437	471	99	298	34	0	13	4,193	34	5.99	2.67	2.24	0.89	15.9	7.1	1.28	.288	4.23	87	3.98	88	8.88	58.1
6	A.J. Griffin	.656	32	21	11	47	47	3.60	235	1	1	0	282.1	245	113	120	46	73	5	0	2	1,159	7	7.49	2.33	3.22	1.47	20.3	6.3	1.13	.249	3.83	93	4.34	111	7.81	-13.3
7	Kenny Rogers K. Rogers	.656	32	21	11	53	53	3.54	206	10	1	0	358.0	350	141	162	27	108	16	0	0	1,498	8	5.18	2.72	1.91	0.68	13.8	7.2	1.28	.283	4.07	76	4.00	87	8.80	24.4
8	Bartolo Colon B. Colon	.651	43	28	15	54	54	2.99	208	3	3	0	342.2	354	114	122	31	52	1	0	3	1,405	1	5.46	1.37	4.00	0.81	14.8	3.7	1.18	.290	3.20	77	3.49	88	9.30	17.8
9	Storm Davis S. Davis	.644	59	38	21	88	77	4.25	283	2	0	0	464.0	494	219	235	43	203	6	2	5	2,017	28	5.49	3.94	1.39	0.83	14.0	10.1	1.50	.304	4.56	112	4.13	109	9.58	-17.4
10	Todd Burns T. Burns	.643	28	18	10	119	18	2.81	152	2	0	12	291.0	247	91	98	21	102	2	39	11	1,193	13	4.70	3.15	1.49	0.65	12.7	8.5	1.20	.247	3.03	76	3.74	100	7.64	-0.4
11	Huston Street H. Street	.636	33	21	12	247	0	2.88	271	0	0	94	269.0	210	86	94	18	78	5	174	16	1,082	7	9.07	2.61	3.47	0.60	25.0	7.2	1.07	.270	3.14	67	2.89	67	7.03	43.9
12	Rich Harden R. Harden	.635	63	40	23	112	104	3.65	614	2	1	0	624.1	529	253	268	58	263	10	2	9	2,606	21	8.85	3.79	2.33	0.84	23.6	10.1	1.27	.284	3.86	84	3.61	83	7.63	52.2
13	Blake Treinen B. Treinen	.621	29	18	11	160	0	2.44	201	0	0	67	177.0	136	48	56	14	70	4	117	6	737	10	10.22	3.56	2.87	0.71	27.3	9.5	1.16	.272	2.85	56	3.18	73	6.92	21.8
14	Don Sutton D. Sutton	.619	21	13	8	29	29	3.89	91	1	1	0	194.1	194	84	88	19	51	0	0	0	819	6	4.21	2.36	1.78	0.88	11.1	6.2	1.26	.266	4.08	100	3.80	94	8.98	5.2
15	Barry Zito B. Zito	.618	165	102	63	225	224	3.58	1,098	9	4	0	1437.1	1,240	572	628	152	566	65	1	14	6,035	26	6.88	3.54	1.94	0.95	18.2	9.4	1.26	.262	3.93	81	4.20	94	7.76	40.5
16	T.J. Mathews	.615	39	24	15	210	0	4.78	180	0	0	8	243.0	252	129	144	32	97	9	67	16	1,074	6	6.67	3.59	1.86	1.19	16.8	9.0	1.44	.291	5.33	103	4.66	100	9.33	-0.6
17	Bob Welch B. Welch	.615	156	96	60	214	195	3.94	677	14	5	0	1271.1	1,263	556	608	134	469	42	4	18	5,431	18	4.79	3.32	1.44	0.95	12.5	8.6	1.36	.275	4.30	102	4.34	111	8.94	-64.2
18	Jarrod Parker J. Parker	.610	41	25	16	61	61	3.73	274	1	0	0	378.1	344	157	163	36	126	10	0	5	1,569	17	6.52	3.00	2.17	0.86	17.5	8.0	1.24	.274	3.88	96	3.93	100	8.18	1
19	Scott Sanderson S. Sanderson	.607	28	17	11	34	34	3.88	128	2	1	0	206.1	205	89	99	27	66	4	0	2	885	7	5.58	2.88	1.94	1.18	14.5	7.5	1.31	.270	4.32	105	4.28	113	8.94	-11.8
20	Dave Stewart D. Stewart	.604	197	119	78	257	245	3.73	1,152	49	9	0	1717.1	1,608	712	784	152	655	42	2	11	7,305	79	6.04	3.43	1.76	0.80	15.8	9.0	1.32	.275	4.11	96	3.84	97	8.43	17.3
21	Tom Underwood T. Underwood	.595	37	22	15	123	30	3.59	187	3	0	12	348.2	329	139	156	28	143	5	40	9	1,491	15	4.83	3.69	1.31	0.72	12.5	9.6	1.35	.267	4.03	94	3.95	100	8.49	0
22	Jim Corsi J. Corsi	.591	22	13	9	159	1	2.75	119	0	0	5	222.1	192	68	77	13	94	6	63	8	922	2	4.82	3.81	1.27	0.53	12.9	10.2	1.29	.259	3.12	64	4.00	93	7.77	7.3
23	Mike Moore M. Moore	.589	112	66	46	137	137	3.54	515	14	4	0	874.0	802	344	383	59	375	18	0	9	3,707	66	5.30	3.86	1.37	0.61	13.9	10.1	1.35	.271	3.94	95	3.84	101	8.26	-4.3
24	Scott Kazmir S. Kazmir	.588	34	20	14	50	50	3.12	265	2	0	0	300.0	255	104	116	23	85	7	0	1	1,217	11	7.95	2.55	3.12	0.69	21.8	7.0	1.13	.277	3.48	84	3.28	86	7.65	17.5
25	Tommy Milone T. Milone	.585	53	31	22	75	73	3.84	324	2	0	0	442.2	458	189	215	61	101	10	0	6	1,863	3	6.59	2.05	3.21	1.24	17.4	5.4	1.26	.290	4.37	100	4.16	107	9.31	-12.7