starting pitcher with most strikeouts by age 25

Roger Clemens has fanned the most career hitters by a 25-year-old starting pitcher, with 344 strikeouts.

	NAME	SO	G	W	L	W%	GS	ERA	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	H/9
1	Roger Clemens R. Clemens	344	37	24	7	.774	37	2.35	17	9	0	294.2	236	77	86	16	60	5	0	1	1,168	2	10.51	1.83	5.73	0.49	29.5	5.1	1.00	.296	2.63	7.21
2	Nolan Ryan N. Ryan	329	39	19	16	.543	39	2.28	20	9	0	284.0	166	72	80	14	157	10	0	4	1,154	18	10.43	4.98	2.10	0.44	28.5	13.6	1.14	.236	2.54	5.26
3	Pedro Martinez P. Martinez	305	31	17	8	.680	31	1.90	13	4	0	241.1	158	51	65	16	67	9	0	5	947	3	11.37	2.50	4.55	0.60	32.2	7.1	0.93	.258	2.42	5.89
4	Tom Seaver T. Seaver	282	36	18	12	.600	36	2.82	19	2	0	290.1	230	91	103	21	83	4	0	8	1,172	6	8.74	2.57	3.40	0.65	24.1	7.1	1.08	.267	3.19	7.13
5	Sam McDowell S. McDowell	278	37	14	15	.483	37	2.03	10	2	0	261.1	184	59	83	14	104	11	0	8	1,078	8	9.57	3.58	2.67	0.48	25.8	9.6	1.10	.253	2.86	6.34
6	Hal Newhouser H. Newhouser	268	35	23	11	.676	35	2.01	28	6	0	290.1	227	65	78	8	102	2	0		1,180	9	8.31	3.16	2.63	0.25	22.7	8.6	1.13	.274	2.42	7.04
7	Johan Santana J. Santana	265	34	20	6	.769	34	2.61	1	1	0	228.0	156	66	70	24	54	9	0	0	881	7	10.46	2.13	4.91	0.95	30.1	6.1	0.92	.250	2.76	6.16
8	Kerry Wood K. Wood	263	34	11	12	.478	34	3.62	2	0	0	221.0	175	89	92	28	95	19	0	4	934	10	10.71	3.87	2.77	1.14	28.2	10.2	1.22	.278	3.75	7.13
9	Fergie Jenkins F. Jenkins	260	40	20	15	.571	40	2.63	20	3	0	308.0	255	90	96	26	65	3	0	7	1,231	6	7.60	1.90	4.00	0.76	21.1	5.3	1.04	.261	2.81	7.45
10	Sandy Koufax S. Koufax	255	35	17	13	.567	35	3.38	15	2	0	244.2	200	92	109	26	92	3	0	6	1,020	10	9.38	3.38	2.77	0.96	25.0	9.0	1.19	.270	4.01	7.36
11	Tim Lincecum T. Lincecum	254	32	15	8	.652	32	2.65	3	1	0	224.0	159	66	71	12	75	4	0	4	894	10	10.21	3.01	3.39	0.48	28.4	8.4	1.04	.268	2.85	6.39
12	Jim Maloney J. Maloney	254	33	20	9	.690	33	2.42	14	6	0	253.1	174	68	72	15	100	4	0	3	1,022	14	9.02	3.55	2.54	0.53	24.9	9.8	1.08	.245	2.56	6.18
13	Juan Marichal J. Marichal	246	40	24	8	.750	40	2.42	18	5	0	319.1	259	86	102	27	59	2	0	6	1,263	2	6.93	1.66	4.17	0.76	19.5	4.7	1.00	.250	2.87	7.30
14	Zack Greinke Z. Greinke	242	33	16	8	.667	33	2.16	6	3	0	229.1	195	55	64	11	51	4	0	0	915	5	9.50	2.00	4.75	0.43	26.4	5.6	1.07	.303	2.51	7.65
15	Fernando Valenzuela F. Valenzuela	242	34	21	11	.656	34	3.14	20	3	0	269.1	226	94	104	18	85	1	0	5	1,102	13	8.09	2.84	2.85	0.60	22.0	7.7	1.15	.275	3.48	7.55
16	Jim Lonborg J. Lonborg	242	38	21	9	.700	38	3.13	15	2	0	267.0	221	93	98	23	81	19	0	5	1,104	10	8.16	2.73	2.99	0.78	21.9	7.3	1.13	.268	3.30	7.45
17	Bill Singer B. Singer	240	40	18	14	.563	40	2.46	16	3	0	307.2	243	84	98	22	71	8	0	4	1,230	6	7.02	2.08	3.38	0.64	19.5	5.8	1.02	.249	2.87	7.11
18	Van Mungo V. Mungo	236	36	18	16	.529	36	2.97	26	2	0	297.0	246	98	122	10	112	2	0		1,233	10	7.15	3.39	2.11	0.30	19.1	9.1	1.21	.270	3.70	7.45
19	Stephen Strasburg S. Strasburg	234	32	10	9	.526	32	3.38	1	1	0	199.2	178	75	86	20	45	7	0	3	809	8	10.55	2.03	5.20	0.90	28.9	5.6	1.12	.314	3.88	8.02
20	Shane Bieber S. Bieber	232	23	13	4	.765	23	2.35	0	0	0	149.1	106	39	41	16	48	4	0	0	599	9	13.98	2.89	4.83	0.96	38.7	8.0	1.03	.301	2.47	6.39
21	Clayton Kershaw C. Kershaw	232	33	16	9	.640	33	1.83	3	2	0	236.0	164	48	55	11	52	3	0	2	908	12	8.85	1.98	4.46	0.42	25.6	5.7	0.92	.251	2.10	6.25
22	Aaron Nola A. Nola	229	34	16	5	.762	34	3.22	0	0	0	204.0	170	73	75	24	71	9	0	4	844	4	10.10	3.13	3.23	1.06	27.1	8.4	1.18	.286	3.31	7.50
23	Jake Peavy J. Peavy	228	32	14	10	.583	32	3.14	2	0	0	206.1	171	72	75	14	67	6	0	7	841	5	9.95	2.92	3.40	0.61	27.1	8.0	1.15	.298	3.27	7.46
24	John Montefusco J. Montefusco	227	37	18	10	.643	37	2.77	9	4	0	266.1	233	82	90	11	88	8	0	11	1,110	5	7.67	2.97	2.58	0.37	20.5	7.9	1.21	.286	3.04	7.87
25	Dylan Cease D. Cease	226	32	13	7	.650	32	3.91	1	1	0	165.2	139	72	77	20	68	9	0	0	708	13	12.28	3.69	3.32	1.09	31.9	9.6	1.25	.309	4.18	7.55