highest strikeout percentage by mlb starting pitcher career with at least 500 games

Randy Johnson had the highest strikeout percentage by a starting pitcher when pitching in 500+ games, with a strikeout percentage of 28.4.

	NAME	K%	G	W	L	W%	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	BB%	WHIP	BABIP	RA	H/9
1	Randy Johnson R. Johnson	28.4	603	301	166	.645	603	3.30	4,818	100	37	0	4103.0	3,320	1,504	1,692	408	1,491	188	0	37	16,937	109	10.57	3.27	3.23	0.89	8.8	1.17	.290	3.71	7.28
2	Nolan Ryan N. Ryan	25.3	773	318	291	.522	773	3.18	5,654	222	61	0	5326.0	3,880	1,884	2,151	314	2,748	156	0	75	22,310	275	9.55	4.64	2.06	0.53	12.3	1.24	.265	3.63	6.56
3	Justin Verlander J. Verlander	24.3	555	266	158	.627	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	6.9	1.14	.280	3.60	7.68
4	Roger Clemens R. Clemens	23.1	707	354	184	.658	707	3.12	4,671	118	46	0	4913.2	4,182	1,706	1,884	363	1,579	159	0	63	20,227	143	8.56	2.89	2.96	0.66	7.8	1.17	.284	3.45	7.66
5	Zack Greinke Z. Greinke	21.4	541	220	153	.590	541	3.48	2,907	17	5	0	3316.0	3,142	1,282	1,377	360	742	77	0	22	13,579	99	7.89	2.01	3.92	0.98	5.5	1.17	.293	3.74	8.53
6	CC Sabathia	20.6	560	251	161	.609	560	3.74	3,091	38	12	0	3576.1	3,404	1,485	1,623	382	1,099	123	0	44	14,986	74	7.78	2.77	2.81	0.96	7.3	1.26	.294	4.08	8.57
7	Mike Mussina M. Mussina	19.3	536	270	153	.638	536	3.68	2,812	57	23	0	3559.0	3,453	1,456	1,557	376	785	60	0	29	14,576	71	7.11	1.99	3.58	0.95	5.4	1.19	.292	3.94	8.73
8	Steve Carlton S. Carlton	19.1	709	327	240	.577	709	3.20	4,104	254	55	0	5165.1	4,616	1,835	2,096	405	1,814	53	0	145	21,457	177	7.15	3.16	2.26	0.71	8.5	1.24	.279	3.65	8.04
9	Tom Seaver T. Seaver	18.8	647	310	203	.604	647	2.86	3,634	231	61	0	4776.1	3,961	1,517	1,670	378	1,387	76	0	115	19,337	123	6.85	2.61	2.62	0.71	7.2	1.12	.258	3.15	7.46
10	Jim Bunning J. Bunning	18.3	519	215	180	.544	519	3.30	2,752	151	40	0	3620.0	3,314	1,327	1,484	364	938	156	0	86	15,021	44	6.84	2.33	2.93	0.90	6.2	1.17	.273	3.69	8.24
11	Bert Blyleven B. Blyleven	18.1	685	286	248	.536	685	3.31	3,694	242	60	0	4957.1	4,614	1,823	2,021	428	1,316	155	0	67	20,429	114	6.71	2.39	2.81	0.78	6.4	1.20	.282	3.67	8.38
12	Andy Pettitte A. Pettitte	17.4	521	255	152	.627	521	3.85	2,437	26	4	0	3300.0	3,433	1,413	1,566	288	1,028	55	0	42	14,013	68	6.65	2.80	2.37	0.79	7.3	1.35	.308	4.27	9.36
13	Fergie Jenkins F. Jenkins	17.3	594	278	218	.560	594	3.32	3,082	267	49	0	4358.2	4,021	1,608	1,786	463	951	83	0	101	17,815	61	6.36	1.96	3.24	0.96	5.3	1.14	.269	3.69	8.30
14	Bartolo Colon B. Colon	17.2	552	246	187	.568	552	4.12	2,502	38	13	0	3434.0	3,565	1,571	1,705	436	944	63	0	47	14,541	45	6.56	2.47	2.65	1.14	6.5	1.31	.295	4.47	9.34
15	Greg Maddux G. Maddux	16.5	740	355	226	.611	740	3.15	3,366	109	35	0	5001.0	4,717	1,750	1,974	351	996	137	0	177	20,388	70	6.06	1.79	3.38	0.63	4.9	1.14	.281	3.55	8.49
16	Don Sutton D. Sutton	16.5	756	321	253	.559	756	3.27	3,545	178	58	0	5248.1	4,670	1,905	2,095	469	1,333	81	0	96	21,500	110	6.08	2.29	2.66	0.80	6.2	1.14	.261	3.59	8.01
17	Jerry Koosman J. Koosman	16.1	527	216	204	.514	527	3.39	2,464	140	33	0	3681.2	3,495	1,388	1,558	285	1,145	67	0	112	15,342	82	6.02	2.80	2.15	0.70	7.5	1.26	.282	3.81	8.54
18	Gaylord Perry G. Perry	16.0	690	305	252	.548	690	3.10	3,372	303	53	0	5156.2	4,762	1,778	2,045	382	1,314	101	0	144	21,140	150	5.89	2.29	2.57	0.67	6.2	1.18	.274	3.57	8.31
19	Frank Tanana F. Tanana	15.7	616	236	236	.500	616	3.67	2,734	143	34	0	4136.1	4,019	1,688	1,893	445	1,227	128	0	110	17,413	114	5.95	2.67	2.23	0.97	7.0	1.27	.278	4.12	8.74
20	Jack Morris J. Morris	15.5	527	251	182	.580	527	3.90	2,443	175	28	0	3746.1	3,501	1,624	1,779	383	1,356	56	0	94	15,791	201	5.87	3.26	1.80	0.92	8.6	1.30	.270	4.27	8.41
21	Phil Niekro P. Niekro	14.7	716	302	262	.535	716	3.37	3,181	245	45	0	5149.2	4,815	1,928	2,227	465	1,703	116	0	73	21,585	207	5.56	2.98	1.87	0.81	7.9	1.27	.270	3.89	8.42
22	Tom Glavine T. Glavine	14.0	682	305	203	.600	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	8.1	1.31	.280	3.87	8.76
23	Jamie Moyer J. Moyer	14.0	638	262	206	.560	638	4.27	2,353	33	10	0	3947.1	4,107	1,872	2,020	509	1,104	142	0	64	16,812	52	5.36	2.52	2.13	1.16	6.6	1.32	.283	4.61	9.36
24	Jim Palmer J. Palmer	13.6	521	262	148	.639	521	2.80	2,142	211	53	0	3857.0	3,256	1,202	1,334	292	1,259	37	0	36	15,714	83	5.00	2.94	1.70	0.68	8.0	1.17	.247	3.11	7.60
25	Rick Reuschel R. Reuschel	13.5	529	208	189	.524	529	3.36	1,990	102	26	0	3503.2	3,537	1,308	1,472	219	915	87	0	112	14,690	88	5.11	2.35	2.17	0.56	6.2	1.27	.289	3.78	9.09