which relief pitcher has the most strikeouts in a season

Dick Radatz has fanned the most batters by a relief pitcher in a season, with 183 strikeouts in 1964.

	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	Dick Radatz D. Radatz	183	1964	BOS	79	16	9	.640	0	2.29	0	0	29	157.0	103	40	44	13	58	7	67	9	634	1	10.49	3.32	3.16	0.75	28.9	9.1	1.03	.241	2.52	5.90
2	Mark Eichhorn M. Eichhorn	166	1986	TOR	69	14	6	.700	0	1.72	0	0	10	157.0	105	30	32	8	45	7	38	14	612	2	9.52	2.58	3.69	0.46	27.1	7.4	0.96	.251	1.83	6.02
3	Dick Radatz D. Radatz	162	1963	BOS	66	15	6	.714	0	2.04	0	0	23	132.1	94	30	31	9	51	5	58	12	541	5	11.02	3.47	3.18	0.61	29.9	9.4	1.10	.271	2.11	6.39
4	Brad Lidge B. Lidge	157	2004	HOU	80	6	5	.545	0	1.90	0	0	29	94.2	57	20	21	8	30	6	44	5	369	3	14.93	2.85	5.23	0.76	42.5	8.1	0.92	.292	2.00	5.42
5	Dick Selma D. Selma	153	1970	PHI	73	8	9	.471	0	2.75	0	0	22	134.1	108	41	42	8	59	4	47	9	553	10	10.25	3.95	2.59	0.54	27.7	10.7	1.24	.304	2.81	7.24
6	Rich Gossage R. Gossage	151	1977	PIT	72	11	9	.550	0	1.62	0	0	26	133.0	78	24	27	9	49	2	55	6	523	2	10.22	3.32	3.08	0.61	28.9	9.4	0.95	.221	1.83	5.28
7	Dick Radatz D. Radatz	144	1962	BOS	62	9	6	.600	0	2.24	0	0	24	124.2	95	31	32	9	40	4	53	2	504	3	10.40	2.89	3.60	0.65	28.6	7.9	1.08	.280	2.31	6.86
8	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
9	Mike Marshall M. Marshall	143	1974	LAD	106	15	12	.556	0	2.42	0	0	21	208.1	191	56	66	9	56	1	83	1	857	5	6.18	2.42	2.55	0.39	16.7	6.5	1.19	.281	2.85	8.25
10	Rob Dibble R. Dibble	141	1989	CIN	74	10	5	.667	0	2.09	0	0	2	99.0	62	23	23	4	39	3	18	11	401	7	12.82	3.55	3.62	0.36	35.2	9.7	1.02	.271	2.09	5.64
11	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
12	Carlos Marmol C. Marmol	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	15.99	6.03	2.65	0.12	41.6	15.7	1.18	.293	2.67	4.64
13	Eric Gagne E. Gagne	137	2003	LAD	77	2	3	.400	0	1.20	0	0	55	82.1	37	11	12	2	20	3	67	2	306	2	14.98	2.19	6.85	0.22	44.8	6.5	0.69	.243	1.31	4.04
14	Rob Dibble R. Dibble	136	1990	CIN	68	8	3	.727	0	1.74	0	0	11	98.0	62	19	22	3	34	1	29	3	384	3	12.49	3.12	4.00	0.28	35.4	8.9	0.98	.281	2.02	5.69
15	Jim Kern J. Kern	136	1979	TEX	71	13	5	.722	0	1.57	0	0	29	143.0	99	25	35	5	62	2	57	6	578	5	8.56	3.90	2.19	0.31	23.5	10.7	1.13	.252	2.20	6.23
16	Dellin Betances D. Betances	135	2014	NYY	70	5	0	1.000	0	1.40	0	0	1	90.0	46	14	15	4	24	4	8	1	341	2	13.50	2.40	5.63	0.40	39.6	7.0	0.78	.241	1.50	4.60
17	John Hiller J. Hiller	134	1974	DET	59	17	14	.548	0	2.64	0	0	13	150.0	127	44	51	10	62	3	52	19	633	7	8.04	3.72	2.16	0.60	21.2	9.8	1.26	.276	3.06	7.62
18	Duane Ward D. Ward	132	1991	TOR	81	7	6	.538	0	2.77	0	0	23	107.1	80	33	36	3	33	2	46	3	428	6	11.07	2.77	4.00	0.25	30.8	7.7	1.05	.298	3.02	6.71
19	Dellin Betances D. Betances	131	2015	NYY	74	6	4	.600	0	1.50	0	0	9	84.0	45	14	17	6	40	3	17	2	332	9	14.04	4.29	3.28	0.64	39.5	12.0	1.01	.257	1.82	4.82
20	Mariano Rivera M. Rivera	130	1996	NYY	61	8	3	.727	0	2.09	0	0	5	107.2	73	25	25	1	34	2	14	3	425	1	10.87	2.84	3.82	0.08	30.6	8.0	0.99	.279	2.09	6.10
21	Rich Gossage R. Gossage	130	1975	CWS	62	9	8	.529	0	1.84	0	0	26	141.2	99	29	32	3	70	5	49	15	583	3	8.26	4.45	1.86	0.19	22.3	12.0	1.19	.256	2.03	6.29
22	Bruce Sutter B. Sutter	129	1977	CHC	62	7	3	.700	0	1.34	0	0	31	107.1	69	16	21	5	23	1	48	7	411	7	10.82	1.93	5.61	0.42	31.4	5.6	0.86	.253	1.76	5.79
23	Octavio Dotel O. Dotel	128	2001	HOU	57	6	3	.667	0	1.93	0	0	2	84.0	55	18	21	3	33	2	20	1	339	4	13.71	3.54	3.88	0.32	37.8	9.7	1.05	.301	2.25	5.89
24	Armando Benitez A. Benitez	128	1999	NYM	77	4	3	.571	0	1.85	0	0	22	78.0	40	16	17	4	41	0	42	4	312	2	14.77	4.73	3.12	0.46	41.0	13.1	1.04	.259	1.96	4.62
25	Scott Garrelts S. Garrelts	128	1987	SFG	64	11	7	.611	0	3.22	0	0	12	106.1	70	38	41	10	55	0	43	4	428	5	10.83	4.66	2.33	0.85	29.9	12.9	1.18	.255	3.47	5.92