the youngest pitcher with 320+ strikeouts in a season

Amos Rusie is the youngest with 320+ strikeouts in a season. He was 19 years old in 1890.

	NAME	AGE	SO	SEASON	TM	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	ERA-	FIP	FIP-	H/9	PRAA
1	Amos Rusie A. Rusie	19	341	1890	NYN	67	29	34	.460	62	2.56	56	4	1	548.2	436	156	300	3	289	26	5		2,379	36	5.59	4.74	1.18	0.05	14.3	12.1	1.32	.252	4.92	73	3.47	92	7.15	17.7
2	Amos Rusie A. Rusie	20	337	1891	NYG	61	33	20	.623	57	2.55	52	6	1	500.1	391	142	244	6	262	18	4		2,167	17	6.06	4.71	1.29	0.11	15.6	12.1	1.31	.249	4.39	78	3.02	89	7.03	19
3	Matt Kilroy M. Kilroy	20	513	1886	BAL	68	29	34	.460	68	3.37	66	5	0	583.0	476	218	350	10	182	19	0		2,469	61	7.92	2.81	2.82	0.15	20.8	7.4	1.13	.267	5.40	100	2.60	77	7.35	47
4	Toad Ramsey T. Ramsey	21	499	1886	LOU	67	38	27	.585	67	2.45	66	3	0	588.2	447	160	297	3	207	12	0		2,477	35	7.63	3.16	2.41	0.05	20.1	8.4	1.11	.253	4.54	71	2.59	76	6.83	54.7
5	Hardie Henderson H. Henderson	21	346	1884	BLA	52	27	23	.540	52	2.62	50	4	0	439.1	382	128	235	9	116	16	0		1,900	45	7.09	2.38	2.98	0.18	18.2	6.1	1.13	.264	4.81	81	2.87	89	7.83	16.5
6	Charlie Sweeney C. Sweeney	21	337	1884	TOT	60	41	15	.732	56	1.70	53	6	1	492.0	360	93	182	6	42		4		1,909	21	6.16	0.77	8.02	0.11	17.7	2.2	0.82		3.33	58	2.32	81	6.59	26.9
7	Sam McDowell S. McDowell	22	325	1965	CLE	42	17	11	.607	35	2.18	14	3	4	273.0	178	66	80	9	132	6	5	7	1,116	17	10.71	4.35	2.46	0.30	29.1	11.8	1.14	.262	2.64	63	2.08	58	5.87	45.4
8	Toad Ramsey T. Ramsey	22	355	1887	LOU	65	37	27	.578	64	3.43	61	0	0	561.0	544	214	358	9	167	16	1		2,430	46	5.70	2.68	2.13	0.14	14.6	6.9	1.27	.284	5.74	78	3.20	76	8.73	64.2
9	Ed Morris E. Morris	23	326	1886	PIT	64	41	20	.672	63	2.45	63	12	1	555.1	455	151	244	5	118	7	1		2,252	22	5.28	1.91	2.76	0.08	14.5	5.2	1.03	.251	3.95	76	2.72	85	7.37	23.7
10	Charlie Buffinton C. Buffinton	23	417	1884	BSN	67	48	16	.750	67	2.15	63	8	0	587.0	506	140	225	15	76		0		2,383	24	6.39	1.17	5.49	0.23	17.5	3.2	0.99		3.45	74	2.57	77	7.76	46.8
11	Mickey Welch M. Welch	24	345	1884	NYG	65	39	21	.650	65	2.50	62	4	0	557.1	528	155	275	12	146		1		2,370	39	5.57	2.36	2.36	0.19	14.6	6.2	1.21		4.44	85	3.10	92	8.53	14.6
12	Nolan Ryan N. Ryan	25	329	1972	CAL	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	79	2.48	83	5.26	16.6
13	Mark Baldwin M. Baldwin	25	368	1889	COL	63	27	34	.443	59	3.61	54	6	1	513.2	458	206	358	9	274	20	4		2,275	83	6.45	4.80	1.34	0.16	16.2	12.0	1.43	.280	6.27	100	3.52	98	8.02	-3
14	Tony Mullane T. Mullane	25	325	1884	TOL	67	36	26	.581	65	2.52	64	7	0	567.0	481	159	276	5	89	32	2		2,364	63	5.16	1.41	3.65	0.08	13.7	3.8	1.01	.249	4.38	76	2.88	88	7.63	27
15	Dupee Shaw D. Shaw	25	451	1884	TOT	67	30	33	.476	66	2.30	60	5	0	543.1	446	139	281	9	109		1		2,244	24	7.47	1.81	4.14	0.15	20.1	4.9	1.02		4.65	77	2.43	81	7.39	29
16	Jim Whitney J. Whitney	25	345	1883	BSN	62	37	21	.638	56	2.24	54	1	2	514.0	492	128	258	7	35		5		2,101	37	6.04	0.61	9.86	0.12	16.4	1.7	1.03		4.52	74	2.29	75	8.61	39.8
17	Nolan Ryan N. Ryan	26	383	1973	CAL	41	21	16	.568	39	2.87	26	4	1	326.0	238	104	113	18	162	7	2	2	1,355	15	10.57	4.47	2.36	0.50	28.3	12.0	1.23	.280	3.12	80	2.48	69	6.57	40.9
18	Tim Keefe T. Keefe	26	359	1883	NYM	68	41	27	.603	68	2.41	68	5	0	619.0	488	166	244	6	108		0		2,517	27	5.22	1.57	3.32	0.09	14.3	4.3	0.96		3.55	72	2.74	82	7.10	45.1
19	Nolan Ryan N. Ryan	27	367	1974	CAL	42	22	16	.579	41	2.89	26	3	0	332.2	221	107	127	18	202	9	1	3	1,392	9	9.93	5.46	1.82	0.49	26.4	14.5	1.27	.255	3.44	85	2.97	84	5.98	20.2
20	Bob Feller B. Feller	27	348	1946	CLE	48	26	15	.634	42	2.18	36	10	4	371.1	277	90	101	11	153	3	5		1,512	3	8.43	3.71	2.27	0.27	23.0	10.1	1.16	.267	2.45	65	2.16	65	6.71	48.3
21	Rube Waddell R. Waddell	27	349	1904	PHA	46	25	19	.568	46	1.62	39	8	0	383.0	307	69	109	5	91	14	0		1,496	8	8.20	2.14	3.84	0.12	23.3	6.1	1.04	.291	2.56	61	1.59	62	7.21	41.5
22	Lady Baldwin L. Baldwin	27	323	1886	DET	56	42	13	.764	56	2.24	55	7	0	487.0	371	121	194	11	100		0		1,936	22	5.97	1.85	3.23	0.20	16.7	5.2	0.97		3.59	68	2.68	81	6.86	33.8
23	Pud Galvin P. Galvin	27	369	1884	BUF	72	46	22	.676	72	1.99	71	12	0	636.1	566	141	254	23	63		0		2,554	16	5.22	0.89	5.86	0.33	14.4	2.5	0.99		3.59	64	2.88	82	8.01	50.9
24	Tim Keefe T. Keefe	27	334	1884	NYM	58	37	17	.685	58	2.25	56	4	0	483.0	380	121	196	5	71	15	0		1,950	15	6.22	1.32	4.70	0.09	17.1	3.6	0.93	.246	3.65	71	2.56	81	7.08	29.1
25	Jim McCormick J. McCormick	27	343	1884	TOT	66	40	25	.615	65	2.37	63	10	0	569.0	508	150	263	19	89		2		2,336	15	5.43	1.41	3.85	0.30	14.7	3.8	1.05		4.16	80	2.97	94	8.04	9.6