Edwin Díaz has the highest K/9 with 60.0+ innings pitched in a season, with 17.13 per nine innings in 2022.

Interpreted as:

best k/9 by a player for season min 60 ip

	NAME	K/9	IP	SEASON	TM	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	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	Edwin Díaz E. Díaz	17.13	62.0	2022	NYM	61	3	1	.750	0	1.31	118	0	0	32	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
2	Craig Kimbrel C. Kimbrel	16.66	62.2	2012	ATL	63	3	1	.750	0	1.01	116	0	0	42	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
3	Craig Kimbrel C. Kimbrel	16.43	69.0	2017	BOS	67	5	0	1.000	0	1.43	126	0	0	35	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
4	Josh Hader J. Hader	16.41	75.2	2019	MIL	61	3	5	.375	0	2.62	138	0	0	37	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
5	Félix Bautista F. Bautista	16.23	61.0	2023	BAL	56	8	2	.800	0	1.48	110	0	0	33	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
6	Carlos Marmol C. Marmol	15.99	77.2	2010	CHC	77	2	3	.400	0	2.55	138	0	0	38	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
7	Aroldis Chapman A. Chapman	15.83	63.2	2013	CIN	68	4	5	.444	0	2.54	112	0	0	38	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
8	Josh Hader J. Hader	15.82	81.1	2018	MIL	55	6	1	.857	0	2.43	143	0	0	12	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
9	Aroldis Chapman A. Chapman	15.74	66.1	2015	CIN	65	4	4	.500	0	1.63	116	0	0	33	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
10	Dellin Betances D. Betances	15.53	73.0	2016	NYY	73	3	6	.333	0	3.08	126	0	0	12	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
11	Dellin Betances D. Betances	15.52	66.2	2018	NYY	66	4	6	.400	0	2.70	115	0	0	4	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
12	Matt Barnes M. Barnes	15.39	64.1	2019	BOS	70	5	4	.556	0	3.78	110	0	0	4	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
13	Aroldis Chapman A. Chapman	15.32	71.2	2012	CIN	68	5	5	.500	0	1.51	122	0	0	38	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
14	Nick Anderson N. Anderson	15.23	65.0	2019	TOT	68	5	4	.556	0	3.32	110	0	0	1	52	24	24	8	18	2	3	4	264	4	2.49	6.11	1.11	41.7	6.8	1.08	.349	3.32	79	2.34	54	7.20	14.7
15	Edwin Díaz E. Díaz	15.22	73.1	2018	SEA	73	0	4	.000	0	1.96	124	0	0	57	41	16	17	5	17	6	65	0	280	3	2.09	7.29	0.61	44.3	6.1	0.79	.281	2.09	48	1.60	38	5.03	21.3
16	Mason Miller M. Miller	15.18	61.2	2025	TOT	60	1	2	.333	0	2.63	104	0	0	22	28	18	19	5	28	1	37	2	234	3	4.09	3.71	0.73	44.4	12.0	0.91	.240	2.77	64	2.22	53	4.09	13.2
17	Kirby Yates K. Yates	14.98	60.2	2019	SDP	60	0	5	.000	0	1.19	101	0	0	41	41	8	14	2	13	7	51	1	243	2	1.93	7.77	0.30	41.6	5.3	0.89	.325	2.08	28	1.29	29	6.08	21
18	Eric Gagne E. Gagne	14.98	82.1	2003	LAD	77	2	3	.400	0	1.20	137	0	0	55	37	11	12	2	20	3	67	2	306	2	2.19	6.85	0.22	44.8	6.5	0.69	.243	1.31	30	0.85	20	4.04	31.8
19	Billy Wagner B. Wagner	14.95	74.2	1999	HOU	66	4	1	.800	0	1.57	124	0	0	39	35	13	14	5	23	1	55	1	286	2	2.77	5.39	0.60	43.4	8.0	0.78	.226	1.69	37	1.64	38	4.22	23.6
20	Brad Lidge B. Lidge	14.93	94.2	2004	HOU	80	6	5	.545	0	1.90	157	0	0	29	57	20	21	8	30	6	44	5	369	3	2.85	5.23	0.76	42.5	8.1	0.92	.292	2.00	44	1.96	44	5.42	25.9
21	Corey Knebel C. Knebel	14.92	76.0	2017	MIL	76	1	4	.200	0	1.78	126	0	0	39	48	15	15	6	40	2	48	5	309	2	4.74	3.15	0.71	40.8	12.9	1.16	.311	1.78	41	2.52	58	5.68	15.4
22	Andrew Miller A. Miller	14.89	74.1	2016	TOT	70	10	1	.909	0	1.45	123	0	0	12	42	12	13	8	9	2	23	0	275	1	1.09	13.67	0.97	44.7	3.3	0.69	.256	1.57	34	1.67	38	5.09	21.7
23	Andrew Miller A. Miller	14.87	62.1	2014	TOT	73	5	5	.500	0	2.02	103	0	0	1	33	14	16	3	17	5	15	2	242	3	2.45	6.06	0.43	42.6	7.0	0.80	.263	2.31	51	1.51	40	4.76	15.8
24	Craig Kimbrel C. Kimbrel	14.84	77.0	2011	ATL	79	4	3	.571	0	2.10	127	0	0	46	48	18	19	3	32	1	64	1	306	4	3.74	3.97	0.35	41.5	10.5	1.04	.315	2.22	56	1.51	40	5.61	19.6
25	Armando Benitez A. Benitez	14.77	78.0	1999	NYM	77	4	3	.571	0	1.85	128	0	0	22	40	16	17	4	41	0	42	4	312	2	4.73	3.12	0.46	41.0	13.1	1.04	.259	1.96	42	2.08	47	4.62	21.3