players with the highest win percentage all-time playing at least 8 seasons

Nolan Ryan averaged a win percentage of .527 when playing 8+ seasons.

	NAME	W%	SEAS	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	Nolan Ryan N. Ryan	.527	26	324	291	805	772	3.19	5,708	222	61	3	5383.0	3,918	1,906	2,173	320	2,792	158	13	77	22,558	276	9.54	4.67	2.04	0.54	25.3	12.4	1.25	.265	3.63	90	2.96	83	6.55	371
2	Tommy John T. John	.557	25	288	229	754	697	3.35	2,236	162	46	3	4690.0	4,760	1,744	2,007	301	1,253	98	21	101	19,601	186	4.29	2.40	1.78	0.58	11.4	6.4	1.28	.284	3.85	90	3.37	89	9.13	207.2
3	Jamie Moyer J. Moyer	.569	24	269	204	688	631	4.24	2,421	33	10	0	4042.2	4,193	1,906	2,055	517	1,139	145	14	69	17,214	55	5.39	2.54	2.13	1.15	14.1	6.6	1.32	.283	4.57	97	4.46	102	9.33	-28
4	Roger Clemens R. Clemens	.658	24	354	184	709	707	3.12	4,672	118	46	0	4916.2	4,185	1,707	1,885	363	1,580	159	0	63	20,240	143	8.55	2.89	2.96	0.66	23.1	7.8	1.17	.284	3.45	70	3.08	71	7.66	680.4
5	Greg Maddux G. Maddux	.610	23	355	227	744	740	3.16	3,371	109	35	0	5008.1	4,726	1,756	1,981	353	999	137	3	177	20,421	70	6.06	1.80	3.37	0.63	16.5	4.9	1.14	.281	3.56	76	3.25	78	8.49	519.5
6	Dennis Martinez D. Martinez	.559	23	245	193	692	562	3.70	2,149	122	30	8	3999.2	3,897	1,643	1,835	372	1,165	122	51	71	16,754	83	4.84	2.62	1.84	0.84	12.8	7.0	1.27	.272	4.13	94	3.91	99	8.77	17
7	Dennis Eckersley D. Eckersley	.544	23	197	165	1,008	361	3.50	2,352	100	20	360	3225.2	3,011	1,256	1,356	339	732	71	524	89	13,283	28	6.56	2.04	3.21	0.95	17.7	5.5	1.16	.273	3.78	86	3.39	85	8.40	221.4
8	Don Sutton D. Sutton	.559	23	324	256	774	756	3.26	3,574	178	58	5	5282.1	4,692	1,914	2,104	472	1,343	82	12	102	21,631	112	6.09	2.29	2.66	0.80	16.5	6.2	1.14	.261	3.58	92	3.23	90	7.99	181.2
9	Phil Niekro P. Niekro	.537	23	318	274	854	716	3.35	3,334	245	45	29	5389.0	5,029	2,004	2,327	481	1,802	122	81	86	22,611	225	5.57	3.01	1.85	0.80	14.7	8.0	1.27	.270	3.89	86	3.61	95	8.40	117.3
10	Jim Kaat J. Kaat	.546	23	283	235	871	623	3.44	2,440	180	31	17	4490.2	4,565	1,716	2,010	389	1,069	120	93	113	18,832	128	4.89	2.14	2.28	0.78	13.0	5.7	1.25	.282	4.03	93	3.40	91	9.15	171
11	Randy Johnson R. Johnson	.646	22	303	166	618	603	3.29	4,875	100	37	2	4135.1	3,346	1,513	1,703	411	1,497	190	7	37	17,067	109	10.61	3.26	3.26	0.89	28.6	8.8	1.17	.291	3.71	75	3.18	73	7.28	554.3
12	Tom Glavine T. Glavine	.600	22	305	203	682	682	3.54	2,607	56	25	0	4413.1	4,298	1,734	1,900	356	1,500	66	0	145	18,604	65	5.32	3.06	1.74	0.73	14.0	8.1	1.31	.280	3.87	86	3.94	94	8.76	120.1
13	Charlie Hough C. Hough	.500	22	216	216	844	440	3.74	2,346	107	13	59	3777.1	3,260	1,569	1,792	375	1,649	173	230	44	16,059	179	5.59	3.93	1.42	0.89	14.6	10.3	1.30	.251	4.27	95	4.26	108	7.77	-130.2
14	Bert Blyleven B. Blyleven	.534	22	287	250	692	685	3.31	3,701	242	60	0	4970.0	4,632	1,830	2,029	430	1,322	155	3	71	20,491	114	6.70	2.39	2.80	0.78	18.1	6.5	1.20	.282	3.67	85	3.18	82	8.39	368.6
15	Joe Niekro J. Niekro	.520	22	221	204	702	500	3.59	1,747	107	29	16	3584.1	3,466	1,431	1,620	276	1,262	65	93	71	15,166	172	4.39	3.17	1.38	0.69	11.5	8.3	1.32	.270	4.07	102	3.79	107	8.70	-109.2
16	Steve Carlton S. Carlton	.575	22	329	243	722	706	3.19	4,110	254	55	2	5183.0	4,625	1,839	2,104	406	1,820	52	7	148	21,525	178	7.14	3.16	2.26	0.70	19.1	8.5	1.24	.279	3.65	87	3.13	86	8.03	277.3
17	Gaylord Perry G. Perry	.542	22	314	265	777	690	3.11	3,534	303	53	10	5350.0	4,938	1,846	2,128	399	1,379	108	33	164	21,953	160	5.95	2.32	2.56	0.67	16.1	6.3	1.18	.275	3.58	85	3.06	85	8.31	312.9
18	Early Wynn E. Wynn	.554	22	300	242	688	608	3.53	2,333	288	49	16	4543.2	4,265	1,783	2,022	338	1,765	64	67	36	19,311	49	4.62	3.50	1.32	0.67	12.1	9.1	1.33	.265	4.01	94	3.63	97	8.45	56.7
19	Jack Quinn J. Quinn	.532	22	247	217	742	443	3.29	1,326	243	28	55	3904.2	4,218	1,426	1,828	103	855	91	209		16,285	62	3.06	1.97	1.55	0.24	8.1	5.3	1.30	.296	4.21	89	3.17	86	9.72	217.2
20	Cy Young C. Young	.618	22	511	316	906	815	2.63	2,803	749	76	17	7356.0	7,092	2,147	3,167	138	1,217	161	84		29,565	156	3.43	1.49	2.30	0.17	9.5	4.1	1.13	.275	3.87	74	2.84	79	8.68	620
21	Bartolo Colon B. Colon	.568	21	247	188	565	552	4.12	2,535	38	13	0	3461.2	3,593	1,584	1,719	439	948	64	2	47	14,655	45	6.59	2.46	2.67	1.14	17.3	6.5	1.31	.296	4.47	95	4.14	96	9.34	71.6
22	David Wells D. Wells	.604	21	239	157	660	489	4.13	2,201	54	12	13	3439.0	3,635	1,578	1,702	407	719	83	65	65	14,413	101	5.76	1.88	3.06	1.07	15.3	5.0	1.27	.293	4.45	93	3.99	90	9.51	172.9
23	Danny Darwin D. Darwin	.484	21	171	182	716	371	3.84	1,942	53	9	32	3016.2	2,951	1,286	1,431	321	874	81	171	101	12,716	52	5.79	2.61	2.22	0.96	15.3	6.9	1.27	.277	4.27	95	3.89	97	8.80	25.3
24	Frank Tanana F. Tanana	.504	21	240	236	638	616	3.66	2,773	143	34	1	4188.1	4,063	1,704	1,910	448	1,255	129	10	116	17,641	119	5.96	2.70	2.21	0.96	15.7	7.1	1.27	.277	4.10	94	3.78	96	8.73	66.4
25	Jerry Reuss J. Reuss	.535	21	220	191	624	546	3.64	1,906	127	39	11	3662.0	3,726	1,480	1,697	244	1,124	59	41	117	15,548	106	4.68	2.76	1.70	0.60	12.3	7.2	1.32	.285	4.17	100	3.44	95	9.16	69.9