most pitcher k's by one player in a season before june 9 of that season

Before June 9, 2025, Nolan Ryan fanned the most batters in a season, with 383 strikeouts in 1973.

	NAME	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	H/9
1	Nolan Ryan N. Ryan	383	1973	CAL	41	21	16	.568	39	2.87	26	4	1	326.0	238	104	113	18	162	7	2	2	1,356	15	10.57	4.47	2.36	0.50	28.2	11.9	1.23	.280	3.12	6.57
2	Sandy Koufax S. Koufax	382	1965	LAD	43	26	8	.765	41	2.04	27	8	2	335.2	216	76	90	26	71	5	2	4	1,297	11	10.24	1.90	5.38	0.70	29.5	5.5	0.86	.234	2.41	5.79
3	Randy Johnson R. Johnson	372	2001	ARI	35	21	6	.778	34	2.49	3	2	0	249.2	181	69	74	19	71	18	1	2	994	8	13.41	2.56	5.24	0.68	37.4	7.1	1.01	.315	2.67	6.52
4	Nolan Ryan N. Ryan	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	5.98
5	Randy Johnson R. Johnson	364	1999	ARI	35	17	9	.654	35	2.48	12	2	0	271.2	207	75	86	30	70	9	0	3	1,079	4	12.06	2.32	5.20	0.99	33.7	6.5	1.02	.292	2.85	6.86
6	Rube Waddell R. Waddell	349	1904	PHA	46	25	19	.568	46	1.62	39	8	0	383.0	307	69	109	5	91	14	0			8	8.20	2.14	3.84	0.12		6.4	1.04	.312	2.56	7.21
7	Bob Feller B. Feller	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	6.71
8	Randy Johnson R. Johnson	347	2000	ARI	35	19	7	.731	35	2.64	8	3	0	248.2	202	73	89	23	76	6	0	1	1,001	5	12.56	2.75	4.57	0.83	34.7	7.6	1.12	.326	3.22	7.31
9	Nolan Ryan N. Ryan	341	1977	CAL	37	19	16	.543	37	2.77	22	4	0	299.0	198	92	110	12	204	9	0	7	1,272	21	10.26	6.14	1.67	0.36	26.8	16.0	1.34	.263	3.31	5.96
10	Randy Johnson R. Johnson	334	2002	ARI	35	24	5	.828	35	2.32	8	4	0	260.0	197	67	78	26	71	13	0	1	1,035	3	11.56	2.46	4.70	0.90	32.3	6.9	1.03	.289	2.70	6.82
11	Randy Johnson R. Johnson	329	1998	TOT	34	19	11	.633	34	3.28	10	6	0	244.1	203	89	102	23	86	14	0	1	1,014	7	12.12	3.17	3.83	0.85	32.4	8.5	1.18	.320	3.76	7.48
12	Nolan Ryan N. Ryan	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	5.26
13	Nolan Ryan N. Ryan	327	1976	CAL	39	17	18	.486	39	3.36	21	7	0	284.1	193	106	117	13	183	5	0	2	1,195	5	10.35	5.79	1.79	0.41	27.4	15.3	1.32	.270	3.70	6.11
14	Gerrit Cole G. Cole	326	2019	HOU	33	20	5	.800	33	2.50	0	0	0	212.1	142	59	66	29	48	3	0	0	817	4	13.82	2.03	6.79	1.23	39.9	5.9	0.89	.275	2.80	6.02
15	Sam McDowell S. McDowell	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	5.87
16	Curt Schilling C. Schilling	319	1997	PHI	35	17	11	.607	35	2.97	7	2	0	254.1	208	84	96	25	58	5	0	3	1,009	5	11.29	2.05	5.50	0.88	31.6	5.7	1.05	.304	3.40	7.36
17	Sandy Koufax S. Koufax	317	1966	LAD	41	27	9	.750	41	1.73	27	5	0	323.0	241	62	74	19	77	0	0	4	1,274	7	8.83	2.15	4.12	0.53	24.9	6.0	0.98	.258	2.06	6.72
18	Curt Schilling C. Schilling	316	2002	ARI	36	23	7	.767	35	3.23	5	1	0	259.1	218	93	95	29	33	3	0	1	1,017	6	10.97	1.15	9.58	1.01	31.1	3.2	0.97	.297	3.30	7.57
19	Walter Johnson W. Johnson	314	1910	WSH	45	25	17	.595	42		38	8	1	370.0	262		92	1	78	13	3		1,418	21	7.64	1.90	4.03	0.02	22.1	5.5	0.92	.258	2.24	6.37
20	Pedro Martinez P. Martinez	313	1999	BOS	31	23	4	.852	29	2.07	5	1	0	213.1	160	49	56	9	37	9	1	1	835	6	13.20	1.56	8.46	0.38	37.5	4.4	0.92	.323	2.36	6.75
21	J.R. Richard	313	1979	HOU	38	18	13	.581	38	2.71	19	4	0	292.1	220	88	98	13	98	3	0	5	1,175	19	9.64	3.02	3.19	0.40	26.6	8.3	1.09	.277	3.02	6.77
22	Steve Carlton S. Carlton	310	1972	PHI	41	27	10	.730	41	1.97	30	8	0	346.1	257	76	84	17	87	1	0	8	1,351	8	8.06	2.26	3.56	0.44	22.9	6.4	0.99	.256	2.18	6.68
23	Chris Sale C. Sale	308	2017	BOS	32	17	8	.680	32	2.90	1	0	0	214.1	165	69	73	24	43	8	0	0	851	3	12.93	1.81	7.16	1.01	36.2	5.1	0.97	.301	3.07	6.93
24	Randy Johnson R. Johnson	308	1993	SEA	35	19	8	.704	34	3.24	10	3	1	255.1	185	92	97	22	99	16	1	1	1,043	8	10.86	3.49	3.11	0.78	29.5	9.5	1.11	.273	3.42	6.52
25	Mickey Lolich M. Lolich	308	1971	DET	45	25	14	.641	45	2.92	29	4	0	376.0	336	122	133	36	92	7	0	2	1,538	7	7.37	2.20	3.35	0.86	20.0	6.0	1.14	.274	3.18	8.04