most strikeouts in one season by a pitcher MLB all-time

	LEAGUE	SO	SEASON	G	W%	W	L	GS	ERA	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	NL	21,582	2019	2,430	.507	1,231	1,199	2,430	4.38	18	11	607	21732.2	20,729	10,587	11,449	3,286	7,974	1,021	482	93,069	783	8.94	3.30	2.71	1.36	23.2	8.6	1.32	.295	4.74	8.58
2	AL	21,328	2023	2,430	.493	1,198	1,232	2,430	4.28	20	11	596	21577.2	20,174	10,255	11,110	2,935	7,844	1,063	258	91,953	844	8.90	3.27	2.72	1.22	23.2	8.5	1.30	.293	4.63	8.41
3	AL	21,241	2019	2,428	.493	1,198	1,230	2,428	4.60	27	15	573	21690.2	21,310	11,097	12,018	3,490	7,921	963	271	93,447	1,005	8.81	3.29	2.68	1.45	22.7	8.5	1.35	.298	4.99	8.84
4	NL	21,162	2021	2,428	.493	1,197	1,231	2,428	4.20	29	18	596	21265.2	19,446	9,914	10,869	2,901	8,053	1,123	471	90,781	842	8.96	3.41	2.63	1.23	23.3	8.9	1.29	.288	4.60	8.23
5	AL	20,983	2021	2,430	.507	1,232	1,198	2,430	4.32	21	11	595	21349.1	20,038	10,248	11,141	3,043	7,741	989	232	91,037	1,020	8.85	3.26	2.71	1.28	23.0	8.5	1.30	.292	4.70	8.45
6	NL	20,782	2018	2,432	.503	1,224	1,208	2,432	4.02	14	8	621	21828.1	20,263	9,760	10,555	2,653	8,020	926	610	92,699	833	8.57	3.31	2.59	1.09	22.4	8.7	1.30	.292	4.35	8.35
7	AL	20,660	2024	2,428	.490	1,190	1,238	2,428	4.01	12	5	606	21539.0	19,510	9,605	10,530	2,759	7,453	1,023	275	90,877	690	8.63	3.11	2.77	1.15	22.7	8.2	1.25	.284	4.40	8.15
8	NL	20,642	2022	2,430	.499	1,213	1,217	2,430	4.05	19	7	610	21516.2	19,956	9,677	10,602	2,636	7,567	1,082	232	91,266	774	8.63	3.17	2.73	1.10	22.6	8.3	1.28	.292	4.43	8.35
9	NL	20,537	2024	2,430	.510	1,239	1,191	2,430	4.13	16	11	619	21577.1	20,313	9,903	10,813	2,694	7,476	997	234	91,572	749	8.57	3.12	2.75	1.12	22.4	8.2	1.29	.294	4.51	8.47
10	NL	20,515	2023	2,430	.507	1,232	1,198	2,430	4.38	15	10	632	21509.2	20,670	10,466	11,322	2,933	7,975	1,049	216	92,151	768	8.58	3.34	2.57	1.23	22.3	8.7	1.33	.297	4.74	8.65
11	AL	20,425	2018	2,430	.497	1,207	1,223	2,430	4.27	21	11	623	21660.2	20,755	10,265	11,075	2,932	7,666	996	319	92,439	1,014	8.49	3.19	2.66	1.22	22.1	8.3	1.31	.295	4.60	8.62
12	AL	20,170	2022	2,430	.501	1,217	1,213	2,430	3.88	17	9	622	21558.2	19,719	9,286	10,215	2,579	7,286	964	243	90,786	833	8.42	3.04	2.77	1.08	22.2	8.0	1.25	.287	4.26	8.23
13	NL	20,158	2017	2,430	.496	1,205	1,225	2,430	4.34	27	13	605	21626.1	21,116	10,418	11,245	2,960	8,108	908	588	92,854	864	8.39	3.37	2.49	1.23	21.7	8.7	1.35	.299	4.68	8.79
14	AL	19,946	2017	2,430	.504	1,225	1,205	2,430	4.37	32	14	574	21630.2	21,099	10,493	11,337	3,145	7,721	855	382	92,441	946	8.30	3.21	2.58	1.31	21.6	8.4	1.33	.295	4.72	8.78
15	NL	19,738	2016	2,428	.494	1,198	1,228	2,428	4.16	39	21	632	21695.1	20,983	10,035	10,888	2,676	7,808	880	600	92,623	919	8.19	3.24	2.53	1.11	21.3	8.4	1.33	.298	4.52	8.70
16	NL	19,715	2012	2,592	.494	1,280	1,312	2,592	3.94	59	35	671	23070.1	22,355	10,106	11,037	2,481	7,894	759	613	98,206	818	7.69	3.08	2.50	0.97	20.1	8.0	1.31	.295	4.31	8.72
17	AL	19,244	2016	2,428	.506	1,229	1,199	2,428	4.20	44	15	644	21611.0	21,293	10,089	10,856	2,934	7,280	771	332	91,957	889	8.01	3.03	2.64	1.22	20.9	7.9	1.32	.297	4.52	8.87
18	NL	19,023	2015	2,430	.493	1,198	1,232	2,430	3.90	38	21	653	21713.1	21,091	9,420	10,225	2,355	7,112	782	560	91,923	820	7.88	2.95	2.67	0.98	20.7	7.7	1.30	.299	4.24	8.74
19	NL	18,956	2010	2,592	.497	1,288	1,304	2,592	4.02	72	36	636	23088.1	22,608	10,300	11,281	2,395	8,508	823	763	99,046	838	7.39	3.32	2.23	0.93	19.1	8.6	1.35	.296	4.40	8.81
20	NL	18,853	2014	2,430	.495	1,202	1,228	2,430	3.66	57	34	645	21815.0	20,633	8,868	9,709	2,035	7,003	820	523	91,773	833	7.78	2.89	2.69	0.84	20.5	7.6	1.27	.295	4.01	8.51
21	NL	18,833	2011	2,590	.498	1,290	1,300	2,590	3.81	80	36	707	23244.0	22,348	9,843	10,772	2,328	8,069	796	766	98,820	782	7.29	3.12	2.33	0.90	19.1	8.2	1.31	.291	4.17	8.65
22	AL	18,588	2014	2,430	.505	1,228	1,202	2,430	3.81	61	31	619	21798.2	20,962	9,239	10,052	2,151	7,017	832	462	92,156	863	7.67	2.90	2.65	0.89	20.2	7.6	1.28	.296	4.15	8.65
23	AL	18,536	2013	2,432	.502	1,220	1,212	2,432	3.99	64	30	637	21806.0	21,312	9,662	10,436	2,509	7,421	736	452	92,681	904	7.65	3.06	2.50	1.04	20.0	8.0	1.32	.296	4.31	8.80
24	AL	18,423	2015	2,428	.507	1,231	1,197	2,428	4.01	66	30	639	21694.1	21,015	9,655	10,422	2,554	6,961	820	391	91,705	938	7.64	2.89	2.65	1.06	20.1	7.6	1.29	.293	4.32	8.72
25	NL	18,205	2009	2,590	.495	1,283	1,307	2,590	4.19	76	30	645	23098.2	22,806	10,753	11,626	2,548	9,028	853	780	99,649	872	7.09	3.52	2.02	0.99	18.3	9.1	1.38	.294	4.53	8.89