highest career win% in the regular season with minimum 500 games by active players

Justin Verlander has the highest win percentage by an active pitcher when pitching in 500+ games, at .627.

	NAME	W%	G	W	L	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	Justin Verlander J. Verlander	.627	555	266	158	555	3.32	3,553	26	9	0	3567.2	3,046	1,317	1,428	371	1,004	121	0	28	14,607	99	8.96	2.53	3.54	0.94	24.3	6.9	1.14	.280	3.60	79	3.43	81	7.68	310.9
2	David Robertson D. Robertson	.596	881	68	46	1	2.93	1,176	0	0	179	894.1	674	291	315	81	365	25	358	38	3,690	57	11.83	3.67	3.22	0.82	31.9	9.9	1.16	.290	3.17	70	2.98	70	6.78	122.3
3	Kenley Jansen K. Jansen	.574	934	54	40	0	2.57	1,278	0	0	475	927.1	610	265	284	88	282	32	700	20	3,680	21	12.40	2.74	4.53	0.85	34.7	7.7	0.96	.261	2.76	65	2.62	64	5.92	147.2
4	Wandy Peralta W. Peralta	.571	502	28	21	2	3.77	376	0	0	13	455.2	410	191	215	51	200	23	109	11	1,959	14	7.43	3.95	1.88	1.01	19.2	10.2	1.34	.274	4.25	90	4.44	104	8.10	-9.5
5	Aroldis Chapman A. Chapman	.561	863	60	47	0	2.52	1,331	0	0	367	821.1	475	230	255	54	408	33	563	7	3,341	87	14.58	4.47	3.26	0.59	39.8	12.2	1.08	.278	2.79	61	2.36	57	5.20	161.8
6	Justin Wilson J. Wilson	.559	648	38	30	0	3.59	618	0	0	20	562.0	493	224	240	51	243	18	123	16	2,386	41	9.90	3.89	2.54	0.82	25.9	10.2	1.31	.304	3.84	88	3.51	86	7.90	36.6
7	Craig Kimbrel C. Kimbrel	.538	851	56	48	0	2.58	1,282	0	0	440	821.2	492	236	263	75	346	40	656	11	3,306	70	14.04	3.79	3.71	0.82	38.8	10.5	1.02	.267	2.88	63	2.60	64	5.39	131.8
8	Blake Treinen B. Treinen	.523	531	45	41	7	2.90	596	0	0	82	576.1	487	186	213	43	223	20	197	26	2,386	24	9.31	3.48	2.67	0.67	25.0	9.3	1.23	.295	3.33	70	3.32	80	7.60	53.5
9	Luis García L. García	.483	603	28	30	4	4.07	547	0	0	17	583.1	572	264	292	53	257	26	144	26	2,557	68	8.44	3.97	2.13	0.82	21.4	10.1	1.42	.310	4.51	99	3.91	93	8.83	19.5
10	Carlos Estévez C. Estévez	.463	505	31	36	0	3.97	494	0	0	124	485.1	455	214	241	59	183	23	249	23	2,086	24	9.16	3.39	2.70	1.09	23.7	8.8	1.31	.298	4.47	85	3.98	91	8.44	22.1
11	Taylor Rogers T. Rogers	.463	566	31	36	0	3.34	626	0	0	83	541.1	482	201	233	57	165	36	164	22	2,256	12	10.41	2.74	3.79	0.95	27.7	7.3	1.20	.310	3.87	79	3.33	79	8.01	54.9
12	Andrew Chafin A. Chafin	.440	643	22	28	3	3.35	591	0	0	20	542.0	462	202	223	39	234	16	105	18	2,288	36	9.81	3.89	2.53	0.65	25.8	10.2	1.28	.300	3.70	80	3.30	80	7.67	50.2
13	Edwin Díaz E. Díaz	.438	520	28	36	0	2.82	839	0	0	253	519.1	356	163	176	54	182	40	395	9	2,105	33	14.54	3.15	4.61	0.94	39.9	8.6	1.04	.305	3.05	70	2.55	61	6.17	93.4
14	Raisel Iglesias R. Iglesias	.433	600	42	55	21	2.92	869	0	0	253	736.0	570	239	265	83	202	27	459	17	2,962	17	10.63	2.47	4.30	1.01	29.3	6.8	1.05	.273	3.24	69	3.19	76	6.97	82.7