Ron Mahay played the most seasons with a win percentage of .900 or better, with 6 seasons.

Interpreted as:

most years with.900 or higher w% as a pitcher

	NAME	SEAS	W%	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	Ron Mahay R. Mahay	6	1.000	18	0	220	1	3.07	209	0	0	2	257.2	213	88	95	26	117	4	33	7	1,087	7	7.30	4.09	1.79	0.91	19.2	10.8	1.28	.256	3.32	68	4.22	95	7.44	7.4
2	Austin Warren A. Warren	4	1.000	7	0	37	0	3.04	40	0	0	1	47.1	42	16	17	5	14	1	5	2	194	1	7.61	2.66	2.86	0.95	20.6	7.2	1.18	.276	3.23	74	3.77	91	7.99	2.2
3	Tim Hill T. Hill	4	1.000	12	0	186	0	3.60	115	0	0	1	172.2	170	69	78	10	52	12	43	6	730	2	5.99	2.71	2.21	0.52	15.8	7.1	1.29	.296	4.07	87	3.69	87	8.86	10.2
4	Ryan Brasier R. Brasier	4	1.000	7	0	147	5	2.95	140	0	0	2	146.1	107	48	54	10	42	3	24	2	582	6	8.61	2.58	3.33	0.62	24.1	7.2	1.02	.251	3.32	67	3.10	72	6.58	19.7
5	Shawn Armstrong S. Armstrong	4	1.000	5	0	105	6	3.52	132	0	0	0	127.2	107	50	58	18	39	8	32	0	537	3	9.31	2.75	3.38	1.27	24.6	7.3	1.14	.262	4.09	81	4.07	94	7.54	3.7
6	José De León J. De León	4	1.000	5	0	9	5	5.64	32	0	0	0	30.1	34	19	25	7	16	5	1	2	144	3	9.49	4.75	2.00	2.08	22.2	11.1	1.65	.321	7.42	138	6.11	148	10.09	-6.8
7	Rob Zastryzny R. Zastryzny	4	1.000	4	0	44	5	3.06	40	0	0	0	50.0	46	17	22	1	23	3	7	1	218	2	7.20	4.14	1.74	0.18	18.3	10.6	1.38	.298	3.96	71	3.41	81	8.28	4.4
8	Ryan Buchter R. Buchter	4	1.000	12	0	132	0	2.88	128	0	0	1	109.1	71	35	41	10	53	2	15	4	442	5	10.54	4.36	2.42	0.82	29.0	12.0	1.13	.245	3.38	70	3.50	85	5.84	7.5
9	Jerry Blevins J. Blevins	4	1.000	13	0	194	0	3.14	162	0	0	2	146.1	115	51	54	16	57	10	32	6	618	6	9.96	3.51	2.84	0.98	26.2	9.2	1.18	.265	3.32	77	3.70	90	7.07	6.7
10	Luis Avilan L. Avilan	4	1.000	13	0	178	0	2.59	129	0	0	0	152.2	112	44	47	7	56	10	20	7	621	9	7.60	3.30	2.30	0.41	20.8	9.0	1.10	.251	2.77	66	3.30	85	6.60	9.8
11	Peter Moylan P. Moylan	4	1.000	5	0	94	0	3.94	50	0	0	1	75.1	80	33	38	9	25	2	23	1	326	4	5.97	2.99	2.00	1.08	15.3	7.7	1.39	.296	4.54	100	4.42	112	9.56	-3.6
12	Brian Bruney B. Bruney	4	1.000	10	0	100	1	3.73	87	0	0	1	94.0	80	39	39	12	53	2	18	3	410	3	8.33	5.07	1.64	1.15	21.2	12.9	1.41	.266	3.73	85	4.65	105	7.66	-2.1
13	Javier Lopez J. Lopez	4	1.000	7	0	244	0	2.26	103	0	0	8	151.1	122	38	49	7	67	4	51	7	616	4	6.13	3.98	1.54	0.42	16.7	10.9	1.25	.264	2.91	55	3.76	94	7.26	3.4
14	Randy Flores R. Flores	4	1.000	7	0	180	1	3.94	91	0	0	2	125.2	150	55	62	10	53	8	28	5	579	4	6.52	3.80	1.72	0.72	15.7	9.2	1.62	.336	4.44	92	4.19	98	10.74	1.9
15	Babe Ruth B. Ruth	4	1.000	5	0	5	4	5.52	5	2	0	0	31.0	40	19	22	1	16	0	1		147	0	1.45	4.65	0.31	0.29	3.4	10.9	1.81	.312	6.39	132	4.73	116	11.61	-2.3
16	Eduard Bazardo E. Bazardo	3	1.000	8	0	108	0	3.08	126	0	0	0	122.2	85	42	43	15	40	4	37	2	486	6	9.24	2.93	3.15	1.10	25.9	8.2	1.02	.233	3.15	80	3.74	94	6.24	3.4
17	Lucas Sims L. Sims	3	1.000	5	0	44	0	6.65	52	0	0	1	44.2	32	33	36	5	31	11	8	0	206	3	10.48	6.25	1.68	1.01	25.2	15.0	1.41	.252	7.25	155	5.10	117	6.45	-3.2
18	Nick Wittgren N. Wittgren	3	1.000	4	0	81	0	4.85	63	0	0	1	81.2	83	44	45	7	27	12	29	2	360	4	6.94	2.98	2.33	0.77	17.5	7.5	1.35	.303	4.96	115	4.18	100	9.15	0.1
19	JT Chargois	3	1.000	4	0	88	8	3.98	80	0	0	1	86.0	72	38	40	10	28	4	20	3	348	0	8.37	2.93	2.86	1.05	23.0	8.0	1.16	.274	4.19	94	3.97	94	7.53	2.4
20	Brent Suter B. Suter	3	1.000	7	0	72	7	2.72	103	0	0	2	115.2	103	35	39	15	18	4	21	0	464	2	8.01	1.40	5.72	1.17	22.2	3.9	1.05	.272	3.03	62	3.65	84	8.01	9.3
21	Travis Bergen T. Bergen	3	1.000	5	0	39	1	3.96	35	0	0	1	38.2	28	17	17	6	26	3	12	2	167	1	8.15	6.05	1.35	1.40	21.0	15.6	1.40	.227	3.96	92	5.64	133	6.52	-6.3
22	Richard Bleier R. Bleier	3	1.000	7	0	111	1	4.40	61	0	0	4	118.2	138	58	61	11	17	8	20	4	500	5	4.63	1.29	3.59	0.83	12.2	3.4	1.31	.315	4.63	96	4.01	88	10.47	7.3
23	Jonathan Loáisiga J. Loáisiga	3	1.000	6	0	24	7	4.01	58	0	0	0	51.2	54	23	28	6	20	4	4	1	228	1	10.10	3.48	2.90	1.05	25.4	8.8	1.43	.343	4.88	93	3.83	87	9.41	3.2
24	Dillon Maples D. Maples	3	1.000	3	0	51	0	4.28	67	0	0	0	48.1	28	23	24	6	40	14	14	0	222	7	12.48	7.45	1.68	1.12	30.2	18.0	1.41	.232	4.47	102	5.36	127	5.21	-6.1
25	Jake Newberry J. Newberry	3	1.000	4	0	61	0	4.07	64	0	0	1	66.1	62	30	33	13	37	3	15	2	291	4	8.68	5.02	1.73	1.76	22.0	12.7	1.49	.282	4.48	89	5.61	128	8.41	-9.3