most single season strikeouts by relief pitcher after 2015

Since 2016, Josh Hader has fanned the most batters by a relief pitcher in a season, with 143 strikeouts in 2018.

	NAME	SO	SEASON	TM	G	W	L	W%	GS	ERA	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Josh Hader J. Hader	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	15.82	3.32	4.77	1.00	46.7	9.8	0.81	.220	2.55	3.98
2	Josh Hader J. Hader	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	16.41	2.38	6.90	1.78	47.8	6.9	0.81	.232	2.85	4.88
3	Craig Kimbrel C. Kimbrel	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	16.43	1.83	9.00	0.78	49.6	5.5	0.68	.260	1.43	4.30
4	Corey Knebel C. Knebel	126	2017	MIL	76	1	4	.200	0	1.78	0	0	39	76.0	48	15	15	6	40	2	48	5	309	2	14.92	4.74	3.15	0.71	40.8	12.9	1.16	.311	1.78	5.68
5	Dellin Betances D. Betances	126	2016	NYY	73	3	6	.333	0	3.08	0	0	12	73.0	54	25	31	5	28	1	20	0	299	6	15.53	3.45	4.50	0.62	42.1	9.4	1.12	.353	3.82	6.66
6	Edwin Díaz E. Díaz	124	2018	SEA	73	0	4	.000	0	1.96	0	0	57	73.1	41	16	17	5	17	6	65	0	280	3	15.22	2.09	7.29	0.61	44.3	6.1	0.79	.281	2.09	5.03
7	Andrew Miller A. Miller	123	2016	TOT	70	10	1	.909	0	1.45	0	0	12	74.1	42	12	13	8	9	2	23	0	275	1	14.89	1.09	13.67	0.97	44.7	3.3	0.69	.256	1.57	5.09
8	Liam Hendriks L. Hendriks	122	2019	OAK	73	4	4	.500	0	1.63	0	0	25	83.0	58	15	16	5	19	2	41	5	322	7	13.23	2.06	6.42	0.54	37.9	5.9	0.93	.305	1.73	6.29
9	Edwin Díaz E. Díaz	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	17.13	2.61	6.56	0.44	50.2	7.7	0.84	.330	1.31	4.94
10	Dellin Betances D. Betances	115	2018	NYY	66	4	6	.400	0	2.70	0	0	4	66.2	44	20	22	7	26	5	15	2	272	4	15.52	3.51	4.42	0.95	42.3	9.6	1.05	.311	2.97	5.94
11	Liam Hendriks L. Hendriks	113	2021	CWS	69	8	3	.727	0	2.54	0	0	38	71.0	45	20	23	11	7	1	58	1	267	6	14.32	0.89	16.14	1.39	42.3	2.6	0.73	.252	2.92	5.70
12	Kyle Barraclough K. Barraclough	113	2016	MIA	75	6	3	.667	0	2.85	0	0	0	72.2	45	23	24	1	44	2	6	1	306	8	14.00	5.45	2.57	0.12	36.9	14.4	1.22	.301	2.97	5.57
13	Adam Ottavino A. Ottavino	112	2018	COL	75	6	4	.600	0	2.43	0	0	6	77.2	41	21	25	5	36	6	16	5	309	7	12.98	4.17	3.11	0.58	36.2	11.7	0.99	.240	2.90	4.75
14	Brad Hand B. Hand	111	2016	SDP	82	4	4	.500	0	2.92	0	0	1	89.1	63	29	32	8	36	1	16	4	364	7	11.18	3.63	3.08	0.81	30.5	9.9	1.11	.264	3.22	6.35
15	Félix Bautista F. Bautista	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	16.23	3.84	4.23	0.59	46.4	11.0	0.92	.274	2.07	4.43
16	Matt Barnes M. Barnes	110	2019	BOS	70	5	4	.556	0	3.78	0	0	4	64.1	51	27	29	8	38	2	14	2	285	13	15.39	5.32	2.89	1.12	38.6	13.3	1.38	.339	4.06	7.13
17	Nick Anderson N. Anderson	110	2019	TOT	68	5	4	.556	0	3.32	0	0	1	65.0	52	24	24	8	18	2	3	4	264	4	15.23	2.49	6.11	1.11	41.7	6.8	1.08	.349	3.32	7.20
18	Kenley Jansen K. Jansen	109	2017	LAD	65	5	0	1.000	0	1.32	0	0	41	68.1	44	10	11	5	7	2	57	0	258	2	14.36	0.92	15.57	0.66	42.2	2.7	0.75	.289	1.45	5.80
19	Jeremiah Estrada J. Estrada	108	2025	SDP	77	4	5	.444	0	3.45	0	0	3	73.0	58	28	31	12	27	3	7	2	304	3	13.32	3.33	4.00	1.48	35.5	8.9	1.16	.299	3.82	7.15
20	Matt Brash M. Brash	107	2023	SEA	78	9	4	.692	0	3.06	0	0	4	70.2	65	24	26	3	29	6	7	0	308	11	13.63	3.69	3.69	0.38	34.7	9.4	1.33	.380	3.31	8.28
21	Luke Jackson L. Jackson	106	2019	ATL	70	9	2	.818	0	3.84	0	0	18	72.2	76	31	34	10	26	2	35	4	315	3	13.13	3.22	4.08	1.24	33.7	8.3	1.40	.386	4.21	9.41
22	Ryan Yarbrough R. Yarbrough	106	2018	TBR	32	14	4	.778	0	3.72	0	0	0	118.2	110	49	52	15	42	6	3	5	505	0	8.04	3.19	2.52	1.14	21.0	8.3	1.28	.283	3.94	8.34
23	Brad Hand B. Hand	106	2018	TOT	69	2	5	.286	0	2.75	0	0	32	72.0	52	22	28	8	28	9	42	2	301	2	13.25	3.50	3.79	1.00	35.2	9.3	1.11	.293	3.50	6.50
24	Bryan Abreu B. Abreu	105	2025	HOU	70	3	4	.429	0	2.28	0	0	7	71.0	51	18	18	4	31	4	19	0	296	4	13.31	3.93	3.39	0.51	35.5	10.5	1.15	.309	2.28	6.46
25	Josh Hader J. Hader	105	2024	HOU	71	8	8	.500	0	3.80	0	0	34	71.0	43	30	33	12	25	1	62	0	278	4	13.31	3.17	4.20	1.52	37.8	9.0	0.96	.230	4.18	5.45

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Some of the information used here was obtained free of charge from Retrosheet.

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