highest k/9 in a season minimum 25 games

James Karinchak and Aroldis Chapman are tied for the best K/9 with 25+ games pitched in a season, with 17.67 per nine innings.

Interpreted as:

highest k/9 by a player in a season minimum 25 games

	NAME	K/9	G	SEASON	TM	W	L	W%	GS	ERA	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	James Karinchak J. Karinchak	17.67	27	2020	CLE	1	2	.333	0	2.67	53	0	0	1	27.0	14	8	9	1	16	0	4	1	109	5	5.33	3.31	0.33	48.6	14.7	1.11	.333	3.00	60	1.52	34	4.67	8.8
2	Aroldis Chapman A. Chapman	17.67	54	2014	CIN	0	3	.000	0	2.00	106	0	0	36	54.0	21	12	12	1	24	2	44	0	202	4	4.00	4.42	0.17	52.5	11.9	0.83	.290	2.00	54	0.89	23	3.50	17
3	Edwin Díaz E. Díaz	17.53	26	2020	NYM	2	1	.667	0	1.75	50	0	0	6	25.2	18	5	6	2	14	2	19	0	110	1	4.91	3.57	0.70	45.5	12.7	1.25	.381	2.10	42	2.17	50	6.31	6.3
4	Edwin Díaz E. Díaz	17.13	61	2022	NYM	3	1	.750	0	1.31	118	0	0	32	62.0	34	9	9	3	18	2	49	1	235	2	2.61	6.56	0.44	50.2	7.7	0.84	.330	1.31	34	0.90	23	4.94	21.2
5	Darwinzon Hernandez D. Hernandez	16.91	29	2019	BOS	0	1	.000	1	4.45	57	0	0	0	30.1	27	15	18	1	26	3	2	1	147	4	7.71	2.19	0.30	38.8	17.7	1.75	.433	5.34	92	2.74	61	8.01	6
6	Carter Capps C. Capps	16.84	30	2015	MIA	1	0	1.000	0	1.16	58	0	0	0	31.0	18	4	5	2	7	2	8	0	118	2	2.03	8.29	0.58	49.2	5.9	0.81	.327	1.45	31	1.09	29	5.23	9.4
7	Craig Kimbrel C. Kimbrel	16.66	63	2012	ATL	3	1	.750	0	1.01	116	0	0	42	62.2	27	7	7	3	14	2	56	0	231	5	2.01	8.29	0.43	50.2	6.1	0.65	.250	1.01	26	0.77	20	3.88	21.6
8	Craig Kimbrel C. Kimbrel	16.43	67	2017	BOS	5	0	1.000	0	1.43	126	0	0	35	69.0	33	11	11	6	14	4	51	0	254	5	1.83	9.00	0.78	49.6	5.5	0.68	.260	1.43	31	1.41	32	4.30	22.7
9	Josh Hader J. Hader	16.41	61	2019	MIL	3	5	.375	0	2.62	138	0	0	37	75.2	41	22	24	15	20	4	46	2	289	0	2.38	6.90	1.78	47.8	6.9	0.81	.232	2.85	59	3.08	70	4.88	11.3
10	Aroldis Chapman A. Chapman	16.31	55	2018	NYY	3	0	1.000	0	2.45	93	0	0	32	51.1	24	14	15	2	30	5	43	0	212	9	5.26	3.10	0.35	43.9	14.2	1.05	.268	2.63	58	2.08	48	4.21	12.5
11	Félix Bautista F. Bautista	16.23	56	2023	BAL	8	2	.800	0	1.48	110	0	0	33	61.0	30	10	14	4	26	2	46	0	237	7	3.84	4.23	0.59	46.4	11.0	0.92	.274	2.07	35	1.87	45	4.43	16
12	Kenley Jansen K. Jansen	16.10	51	2011	LAD	2	1	.667	0	2.85	96	0	0	5	53.2	30	17	17	3	26	2	13	0	218	0	4.36	3.69	0.50	44.0	11.9	1.04	.297	2.85	79	1.73	46	5.03	12.5
13	Carlos Marmol C. Marmol	15.99	77	2010	CHC	2	3	.400	0	2.55	138	0	0	38	77.2	40	22	23	1	52	8	70	4	332	2	6.03	2.65	0.12	41.6	15.7	1.18	.293	2.67	62	2.00	50	4.64	17.4
14	Aroldis Chapman A. Chapman	15.89	61	2023	TOT	6	4	.600	0	3.09	103	0	0	6	58.1	37	20	24	4	36	1	18	2	249	9	5.55	2.86	0.62	41.4	14.5	1.25	.314	3.70	71	2.51	58	5.71	11.7
15	Aroldis Chapman A. Chapman	15.83	68	2013	CIN	4	5	.444	0	2.54	112	0	0	38	63.2	37	18	18	7	29	3	55	0	258	6	4.10	3.86	0.99	43.4	11.2	1.04	.280	2.54	67	2.46	64	5.23	9.8
16	Josh Hader J. Hader	15.82	55	2018	MIL	6	1	.857	0	2.43	143	0	0	12	81.1	36	22	23	9	30	1	14	0	306	0	3.32	4.77	1.00	46.7	9.8	0.81	.220	2.55	60	2.22	55	3.98	16.6
17	Aroldis Chapman A. Chapman	15.74	65	2015	CIN	4	4	.500	0	1.63	116	0	0	33	66.1	43	12	13	3	33	5	54	1	278	7	4.48	3.52	0.41	41.7	11.9	1.15	.331	1.76	41	1.94	49	5.83	14.6
18	Josh Hader J. Hader	15.65	60	2021	MIL	4	2	.667	0	1.23	102	0	0	34	58.2	25	8	8	3	24	2	42	0	224	3	3.68	4.25	0.46	45.5	10.7	0.84	.237	1.23	29	1.68	39	3.84	16.8
19	Dellin Betances D. Betances	15.53	73	2016	NYY	3	6	.333	0	3.08	126	0	0	12	73.0	54	25	31	5	28	1	20	0	299	6	3.45	4.50	0.62	42.1	9.4	1.12	.353	3.82	73	1.77	40	6.66	20.7
20	Dellin Betances D. Betances	15.52	66	2018	NYY	4	6	.400	0	2.70	115	0	0	4	66.2	44	20	22	7	26	5	15	2	272	4	3.51	4.42	0.95	42.3	9.6	1.05	.311	2.97	63	2.47	57	5.94	13.5
21	Aroldis Chapman A. Chapman	15.50	61	2021	NYY	6	4	.600	0	3.36	97	0	0	30	56.1	36	21	23	9	38	3	46	2	243	7	6.07	2.55	1.44	39.9	15.6	1.31	.281	3.67	79	3.98	92	5.75	2.1
22	Matt Barnes M. Barnes	15.39	70	2019	BOS	5	4	.556	0	3.78	110	0	0	4	64.1	51	27	29	8	38	2	14	2	285	13	5.32	2.89	1.12	38.6	13.3	1.38	.339	4.06	78	3.26	72	7.13	9
23	Edwin Díaz E. Díaz	15.36	66	2019	NYM	2	7	.222	0	5.59	99	0	0	26	58.0	58	36	36	15	22	4	48	3	254	3	3.41	4.50	2.33	39.0	8.7	1.38	.377	5.59	137	4.50	105	9.00	-1.4
24	Edwin Díaz E. Díaz	15.33	49	2016	SEA	0	4	.000	0	2.79	88	0	0	18	51.2	45	16	16	5	15	3	23	2	217	6	2.61	5.87	0.87	40.6	6.9	1.16	.377	2.79	70	2.04	49	7.84	12.4
25	Aroldis Chapman A. Chapman	15.32	68	2012	CIN	5	5	.500	0	1.51	122	0	0	38	71.2	35	12	13	4	23	4	52	0	276	4	2.89	5.30	0.50	44.2	8.3	0.81	.252	1.63	38	1.54	38	4.40	19.3