best k/9 season in a season MLB history

	LEAGUE	K/9	SEASON	G	W%	W	L	GS	ERA	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	IBB	TBF	WP	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	NL	9.14	2020	898	.500	449	449	898	4.47	7,810	18	7	193	7689.1	7,173	3,815	4,185	1,144	3,068	422	126	33,088	325	3.59	2.55	1.34	23.6	9.3	1.33	.292	4.90	8.40
2	AL	9.00	2020	898	.500	449	449	898	4.42	7,776	11	5	229	7779.1	7,266	3,823	4,159	1,160	3,024	399	76	33,418	350	3.50	2.57	1.34	23.3	9.0	1.32	.290	4.81	8.41
3	NL	8.96	2021	2,428	.493	1,197	1,231	2,428	4.20	21,162	29	18	596	21265.2	19,446	9,914	10,869	2,901	8,053	1,123	471	90,781	842	3.41	2.63	1.23	23.3	8.9	1.29	.288	4.60	8.23
4	NL	8.94	2019	2,430	.507	1,231	1,199	2,430	4.38	21,582	18	11	607	21732.2	20,729	10,587	11,449	3,286	7,974	1,021	482	93,069	783	3.30	2.71	1.36	23.2	8.6	1.32	.295	4.74	8.58
5	AL	8.90	2023	2,430	.493	1,198	1,232	2,430	4.28	21,328	20	11	596	21577.2	20,174	10,255	11,110	2,935	7,844	1,063	258	91,953	844	3.27	2.72	1.22	23.2	8.5	1.30	.293	4.63	8.41
6	AL	8.85	2021	2,430	.507	1,232	1,198	2,430	4.32	20,983	21	11	595	21349.1	20,038	10,248	11,141	3,043	7,741	989	232	91,037	1,020	3.26	2.71	1.28	23.0	8.5	1.30	.292	4.70	8.45
7	AL	8.81	2019	2,428	.493	1,198	1,230	2,428	4.60	21,241	27	15	573	21690.2	21,310	11,097	12,018	3,490	7,921	963	271	93,447	1,005	3.29	2.68	1.45	22.7	8.5	1.35	.298	4.99	8.84
8	NL	8.63	2022	2,430	.499	1,213	1,217	2,430	4.05	20,642	19	7	610	21516.2	19,956	9,677	10,602	2,636	7,567	1,082	232	91,266	774	3.17	2.73	1.10	22.6	8.3	1.28	.292	4.43	8.35
9	AL	8.63	2024	2,428	.490	1,190	1,238	2,428	4.01	20,660	12	5	606	21539.0	19,510	9,605	10,530	2,759	7,453	1,023	275	90,877	690	3.11	2.77	1.15	22.7	8.2	1.25	.284	4.40	8.15
10	NL	8.58	2023	2,430	.507	1,232	1,198	2,430	4.38	20,515	15	10	632	21509.2	20,670	10,466	11,322	2,933	7,975	1,049	216	92,151	768	3.34	2.57	1.23	22.3	8.7	1.33	.297	4.74	8.65
11	AL	8.58	2025	2,430	.503	1,222	1,208	2,430	4.09	20,560	15	5	588	21564.1	19,885	9,793	10,663	2,888	7,760	930	309	91,374	702	3.24	2.65	1.21	22.5	8.5	1.28	.287	4.45	8.30
12	NL	8.57	2018	2,432	.503	1,224	1,208	2,432	4.02	20,782	14	8	621	21828.1	20,263	9,760	10,555	2,653	8,020	926	610	92,699	833	3.31	2.59	1.09	22.4	8.7	1.30	.292	4.35	8.35
13	NL	8.57	2024	2,430	.510	1,239	1,191	2,430	4.13	20,537	16	11	619	21577.1	20,313	9,903	10,813	2,694	7,476	997	234	91,572	749	3.12	2.75	1.12	22.4	8.2	1.29	.294	4.51	8.47
14	AL	8.49	2018	2,430	.497	1,207	1,223	2,430	4.27	20,425	21	11	623	21660.2	20,755	10,265	11,075	2,932	7,666	996	319	92,439	1,014	3.19	2.66	1.22	22.1	8.3	1.31	.295	4.60	8.62
15	AL	8.42	2022	2,430	.501	1,217	1,213	2,430	3.88	20,170	17	9	622	21558.2	19,719	9,286	10,215	2,579	7,286	964	243	90,786	833	3.04	2.77	1.08	22.2	8.0	1.25	.287	4.26	8.23
16	NL	8.40	2025	2,430	.497	1,208	1,222	2,430	4.22	20,085	14	8	613	21510.2	20,253	10,076	10,951	2,762	7,619	998	247	91,552	728	3.19	2.64	1.16	21.9	8.3	1.30	.291	4.58	8.47
17	NL	8.39	2017	2,430	.496	1,205	1,225	2,430	4.34	20,158	27	13	605	21626.1	21,116	10,418	11,245	2,960	8,108	908	588	92,854	864	3.37	2.49	1.23	21.7	8.7	1.35	.299	4.68	8.79
18	AL	8.30	2017	2,430	.504	1,225	1,205	2,430	4.37	19,946	32	14	574	21630.2	21,099	10,493	11,337	3,145	7,721	855	382	92,441	946	3.21	2.58	1.31	21.6	8.4	1.33	.295	4.72	8.78
19	NL	8.19	2016	2,428	.494	1,198	1,228	2,428	4.16	19,738	39	21	632	21695.1	20,983	10,035	10,888	2,676	7,808	880	600	92,623	919	3.24	2.53	1.11	21.3	8.4	1.33	.298	4.52	8.70
20	AL	8.01	2016	2,428	.506	1,229	1,199	2,428	4.20	19,244	44	15	644	21611.0	21,293	10,089	10,856	2,934	7,280	771	332	91,957	889	3.03	2.64	1.22	20.9	7.9	1.32	.297	4.52	8.87
21	NL	7.88	2015	2,430	.493	1,198	1,232	2,430	3.90	19,023	38	21	653	21713.1	21,091	9,420	10,225	2,355	7,112	782	560	91,923	820	2.95	2.67	0.98	20.7	7.7	1.30	.299	4.24	8.74
22	NL	7.78	2014	2,430	.495	1,202	1,228	2,430	3.66	18,853	57	34	645	21815.0	20,633	8,868	9,709	2,035	7,003	820	523	91,773	833	2.89	2.69	0.84	20.5	7.6	1.27	.295	4.01	8.51
23	NL	7.69	2012	2,592	.494	1,280	1,312	2,592	3.94	19,715	59	35	671	23070.1	22,355	10,106	11,037	2,481	7,894	759	613	98,206	818	3.08	2.50	0.97	20.1	8.0	1.31	.295	4.31	8.72
24	AL	7.67	2014	2,430	.505	1,228	1,202	2,430	3.81	18,588	61	31	619	21798.2	20,962	9,239	10,052	2,151	7,017	832	462	92,156	863	2.90	2.65	0.89	20.2	7.6	1.28	.296	4.15	8.65
25	AL	7.65	2013	2,432	.502	1,220	1,212	2,432	3.99	18,536	64	30	637	21806.0	21,312	9,662	10,436	2,509	7,421	736	452	92,681	904	3.06	2.50	1.04	20.0	8.0	1.32	.296	4.31	8.80