most strikeouts per nine innings in a year minimum 20 strikeouts

Rafael Martin has the best K/9 with 20+ strikeouts in a season, with 18.24 per nine innings in his rookie season in 2015.

Interpreted as:

most strikeouts per nine innings by a player in a year minimum 20 strikeouts

	NAME	K/9	SO	SEASON	TM	G	W	L	W%	GS	ERA	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	Rafael Martin R. Martin	18.24	25	2015	WSH	13	2	0	1.000	0	5.11	0	0	0	12.1	12	7	9	4	5	1	5	0	56	0	3.65	5.00	2.92	44.6	8.9	1.38	.381	6.57	130	4.75	124	8.76	-1.3
2	Devin Williams D. Williams	17.67	53	2020	MIL	22	4	1	.800	0	0.33	0	0	0	27.0	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	7	0.85	19	2.67	10.8
3	James Karinchak J. Karinchak	17.67	53	2020	CLE	27	1	2	.333	0	2.67	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
4	Aroldis Chapman A. Chapman	17.67	106	2014	CIN	54	0	3	.000	0	2.00	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
5	Edwin Díaz E. Díaz	17.53	50	2020	NYM	26	2	1	.667	0	1.75	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
6	Craig Kimbrel C. Kimbrel	17.42	40	2010	ATL	21	4	0	1.000	0	0.44	0	0	1	20.2	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	11	1.52	39	3.92	5.6
7	Sean Reynolds S. Reynolds	17.18	21	2024	SDP	9	0	0		0	0.82	0	0	0	11.0	10	1	1	0	5	1	3	0	49	0	4.09	4.20	0.00	42.9	10.2	1.36	.455	0.82	21	0.98	24	8.18	3.7
8	Edwin Díaz E. Díaz	17.13	118	2022	NYM	61	3	1	.750	0	1.31	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
9	Aroldis Chapman A. Chapman	16.97	22	2020	NYY	13	1	1	.500	0	3.09	0	0	3	11.2	6	4	4	2	4	1	8	0	45	0	3.09	5.50	1.54	48.9	8.9	0.86	.250	3.09	70	2.92	65	4.63	2
10	Darwinzon Hernandez D. Hernandez	16.91	57	2019	BOS	29	0	1	.000	1	4.45	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
11	Carter Capps C. Capps	16.84	58	2015	MIA	30	1	0	1.000	0	1.16	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
12	Craig Kimbrel C. Kimbrel	16.66	116	2012	ATL	63	3	1	.750	0	1.01	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
13	Craig Kimbrel C. Kimbrel	16.43	28	2020	CHC	18	0	1	.000	0	5.28	0	0	2	15.1	10	9	9	2	12	2	11	1	69	4	7.04	2.33	1.17	40.6	17.4	1.43	.320	5.28	119	3.96	90	5.87	0.7
14	Craig Kimbrel C. Kimbrel	16.43	126	2017	BOS	67	5	0	1.000	0	1.43	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
15	Josh Hader J. Hader	16.41	138	2019	MIL	61	3	5	.375	0	2.62	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
16	Aroldis Chapman A. Chapman	16.31	93	2018	NYY	55	3	0	1.000	0	2.45	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
17	Félix Bautista F. Bautista	16.23	110	2023	BAL	56	8	2	.800	0	1.48	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
18	José De León J. De León	16.20	33	2021	CIN	9	0	1	.000	2	8.35	0	0	0	18.1	22	17	17	4	11	2	1	0	91	3	5.40	3.00	1.96	36.3	12.1	1.80	.439	8.35	189	4.53	102	10.80	-0.1
19	Kenley Jansen K. Jansen	16.10	96	2011	LAD	51	2	1	.667	0	2.85	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
20	Carlos Marmol C. Marmol	15.99	138	2010	CHC	77	2	3	.400	0	2.55	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
21	Aroldis Chapman A. Chapman	15.89	103	2023	TOT	61	6	4	.600	0	3.09	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
22	Zac Rosscup Z. Rosscup	15.88	20	2018	LAD	17	0	1	.000	0	4.76	0	0	0	11.1	9	6	6	3	4	0	5	0	47	0	3.18	5.00	2.38	42.6	8.5	1.15	.300	4.76	125	4.13	103	7.15	-0.1
23	Aroldis Chapman A. Chapman	15.83	112	2013	CIN	68	4	5	.444	0	2.54	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
24	Josh Hader J. Hader	15.82	143	2018	MIL	55	6	1	.857	0	2.43	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
25	Devin Williams D. Williams	15.78	38	2024	MIL	22	1	0	1.000	0	1.25	0	0	14	21.2	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	30	2.05	50	4.15	4.9