highest so/9 in a season by a relief pitcher with at least 20 ip

Devin Williams, James Karinchak and Aroldis Chapman are tied for the best K/9 by a relief pitcher with 20.0+ innings pitched in a season, with 17.67 per nine innings.

	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	H/9
1	Devin Williams D. Williams	17.67	27.0	2020	MIL	22	4	1	.800	0	0.33	53	0	0	0	8	1	4	1	9	1	1	0	100	3	3.00	5.89	0.33	53.0	9.0	0.63	.194	1.33	2.67
2	James Karinchak J. Karinchak	17.67	27.0	2020	CLE	27	1	2	.333	0	2.67	53	0	0	1	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	4.67
3	Aroldis Chapman A. Chapman	17.67	54.0	2014	CIN	54	0	3	.000	0	2.00	106	0	0	36	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	3.50
4	Edwin Díaz E. Díaz	17.53	25.2	2020	NYM	26	2	1	.667	0	1.75	50	0	0	6	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	6.31
5	Craig Kimbrel C. Kimbrel	17.42	20.2	2010	ATL	21	4	0	1.000	0	0.44	40	0	0	1	9	1	2	0	16	0	7	1	88	4	6.97	2.50	0.00	45.5	18.2	1.21	.281	0.87	3.92
6	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	4.94
7	Carter Capps C. Capps	16.84	31.0	2015	MIA	30	1	0	1.000	0	1.16	58	0	0	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	5.23
8	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	3.88
9	Darwinzon Hernandez D. Hernandez	16.46	27.1	2019	BOS	28	0	0		0	3.95	50	0	0	0	24	12	14	1	21	3	2	1	129	4	6.91	2.38	0.33	38.8	16.3	1.65	.426	4.61	7.90
10	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	4.30
11	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	4.88
12	Aroldis Chapman A. Chapman	16.31	51.1	2018	NYY	55	3	0	1.000	0	2.45	93	0	0	32	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	4.21
13	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	4.43
14	Kenley Jansen K. Jansen	16.10	53.2	2011	LAD	51	2	1	.667	0	2.85	96	0	0	5	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	5.03
15	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	4.64
16	Aroldis Chapman A. Chapman	15.89	58.1	2023	TOT	61	6	4	.600	0	3.09	103	0	0	6	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	5.71
17	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	5.23
18	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	3.98
19	Devin Williams D. Williams	15.78	21.2	2024	MIL	22	1	0	1.000	0	1.25	38	0	0	14	10	3	3	1	11	2	19	1	88	1	4.57	3.45	0.42	43.2	12.5	0.97	.250	1.25	4.15
20	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	5.83
21	Drew Pomeranz D. Pomeranz	15.70	28.2	2019	TOT	28	0	1	.000	0	1.88	50	0	0	2	16	6	6	3	8	0	4	0	106	0	2.51	6.25	0.94	47.2	7.5	0.84	.289	1.88	5.02
22	Josh Hader J. Hader	15.65	58.2	2021	MIL	60	4	2	.667	0	1.23	102	0	0	34	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	3.84
23	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	6.66
24	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	5.94
25	Aroldis Chapman A. Chapman	15.50	56.1	2021	NYY	61	6	4	.600	0	3.36	97	0	0	30	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	5.75