most strikeouts by a pitcher before turning 21

Bob Feller has struck out the most career batters by a pitcher younger than 21, with 712 strikeouts.

Interpreted as:

most strikeouts by a pitcher before turning 21 years old

	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	Bob Feller B. Feller	712	118	55	30	.647	98	3.43	58	6	4	785.0	620	299	338	31	503	16	15		3,418	32	8.16	5.77	1.42	0.36	20.8	14.7	1.43	.273	3.88	7.11
2	Dwight Gooden D. Gooden	544	66	41	13	.759	66	2.00	23	11	0	494.2	359	110	123	20	142	4	0	6	1,944	9	9.90	2.58	3.83	0.36	28.0	7.3	1.01	.275	2.24	6.53
3	Bert Blyleven B. Blyleven	359	65	26	24	.520	63	2.95	22	6	0	442.1	410	145	161	38	106	7	1	7	1,801	7	7.30	2.16	3.39	0.77	19.9	5.9	1.17	.288	3.28	8.34
4	Gary Nolan G. Nolan	338	60	24	15	.615	57	2.63	12	7	0	393.1	316	115	132	32	119	8	1	9	1,604	7	7.73	2.72	2.84	0.73	21.1	7.4	1.11	.257	3.02	7.23
5	Larry Dierker L. Dierker	290	73	23	22	.511	63	3.30	13	2	0	441.1	409	162	190	38	110	5	4	6	1,832	21	5.91	2.24	2.64	0.77	15.8	6.0	1.18	.267	3.87	8.34
6	Mike McCormick M. McCormick	290	116	26	26	.500	66	4.30	16	5	5	485.1	491	232	264	51	187	7	22	21	2,101	19	5.38	3.47	1.55	0.95	13.8	8.9	1.40	.281	4.90	9.11
7	Felix Hernandez F. Hernandez	265	44	17	18	.486	44	3.84	2	1	0	283.1	259	121	131	28	85	8	0	2	1,173	14	8.42	2.70	3.12	0.89	22.6	7.2	1.21	.294	4.16	8.23
8	Pete Schneider P. Schneider	263	114	27	47	.365	74	2.61	39	7	5	643.2	610		270	9	227	26	32			4	3.68	3.17	1.16	0.13		8.4	1.30	.276	3.78	8.53
9	Joe Wood J. Wood	251	65	24	21	.533	38		28	8	0	379.1	290		144	4	113	20	20		1,517	10	5.96	2.68	2.22	0.09	16.5	7.4	1.06	.253	3.42	6.88
10	Hal Newhouser H. Newhouser	223	72	20	22	.476	51	4.60	15	1	3	344.2	335	176	206	20	227	3	15		1,571	9	5.82	5.93	0.98	0.52	14.2	14.4	1.63	.287	5.38	8.75
11	Jim Palmer J. Palmer	222	57	20	14	.588	36	3.54	6	0	1	300.1	251	118	132	27	147	2	7	2	1,262	11	6.65	4.41	1.51	0.81	17.6	11.6	1.33	.259	3.96	7.52
12	Ed Correa E. Correa	221	41	14	15	.483	37	4.24	4	2	0	237.2	200	112	121	19	148	5	3	2	1,043	21	8.37	5.60	1.49	0.72	21.2	14.2	1.46	.278	4.58	7.57
13	Milt Pappas M. Pappas	212	72	26	21	.553	52	3.77	19	4	3	375.0	340	157	169	20	138	7	12	4	1,567	22	5.09	3.31	1.54	0.48	13.5	8.8	1.27	.269	4.06	8.16
14	Ray Sadecki R. Sadecki	209	57	23	19	.548	57	3.74	20	1	0	380.0	344	158	176	43	188	4	0	3	1,639	16	4.95	4.45	1.11	1.02	12.8	11.5	1.40	.252	4.17	8.15
15	Curt Simmons C. Simmons	202	75	16	24	.400	42	4.41	12	0	1	347.0	332	170	194	17	192	3	18		1,542	7	5.24	4.98	1.05	0.44	13.1	12.5	1.51	.279	5.03	8.61
16	Fernando Valenzuela F. Valenzuela	196	35	15	7	.682	25	2.27	11	8	1	210.0	148	53	57	11	66	1	4	4	824	4	8.40	2.83	2.97	0.47	23.8	8.0	1.02	.249	2.44	6.34
17	Catfish Hunter C. Hunter	185	62	17	19	.472	45	4.13	7	2	0	309.2	282	142	155	38	110	4	2	9	1,306	4	5.38	3.20	1.68	1.10	14.2	8.4	1.27	.252	4.50	8.20
18	Don Gullett D. Gullett	183	79	21	8	.724	33	2.59	4	3	6	295.1	250	85	96	18	108	2	15	12	1,214	9	5.58	3.29	1.69	0.55	15.1	8.9	1.21	.257	2.93	7.62
19	Wally Bunker W. Bunker	181	64	29	14	.674	57	3.12	16	2	2	407.0	341	141	157	34	123	7	3	7	1,653	5	4.00	2.72	1.47	0.75	10.9	7.4	1.14	.235	3.47	7.54
20	Ray Keating R. Keating	175	53	7	24	.226	42	2.74	19	2	0	319.0	310		166	4	121	6	7			16	4.94	3.41	1.45	0.11		8.8	1.35	.287	4.68	8.75
21	Ken Holtzman K. Holtzman	174	37	11	16	.407	33	3.77	9	0	0	224.2	196	94	108	28	71	4	2	5	930	8	6.97	2.84	2.45	1.12	18.7	7.6	1.19	.257	4.33	7.85
22	Jose Rijo J. Rijo	167	43	9	14	.391	21	4.33	0	0	2	172.1	162	83	92	17	85	3	9	5	755	4	8.72	4.44	1.96	0.89	22.1	11.3	1.43	.300	4.80	8.46
23	Rube Bressler R. Bressler	165	61	14	21	.400	30	3.64	15	2	2	326.0	295		170	4	174	11	23			10	4.56	4.80	0.95	0.11		12.6	1.44	.283	4.69	8.14
24	Walter Johnson W. Johnson	162	36	14	14	.500	30		23	6	1	256.1	194		75	0	54	11	6		999	13	5.69	1.90	3.00	0.00	16.2	5.4	0.97	.251	2.63	6.81
25	Dennis Eckersley D. Eckersley	152	34	13	7	.650	24	2.60	6	2	2	186.2	147	54	61	16	90	7	5	8	794	4	7.33	4.34	1.69	0.77	19.1	11.3	1.27	.248	2.94	7.09