most strike outs in a season by a closing pitcher with at least 30 ip; after 1920

Since 1921, Nolan Ryan has struck out the most batters with 30.0+ innings pitched in a season, with 383 strikeouts in 1973.

	NAME	SO	IP	SEASON	TM	G	W	L	W%	GS	ERA	CG	SHO	SV	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Nolan Ryan N. Ryan	383	326.0	1973	CAL	41	21	16	.568	39	2.87	26	4	1	238	104	113	18	162	7	2	2	1,355	15	10.57	4.47	2.36	0.50	28.3	12.0	1.23	.280	3.12	80	2.48	69	6.57	40.9
2	Sandy Koufax S. Koufax	382	335.2	1965	LAD	43	26	8	.765	41	2.04	27	8	2	216	76	90	26	71	5	2	4	1,297	11	10.24	1.90	5.38	0.70	29.5	5.5	0.86	.234	2.41	63	1.93	61	5.79	47.9
3	Randy Johnson R. Johnson	372	249.2	2001	ARI	35	21	6	.778	34	2.49	3	2	0	181	69	74	19	71	18	1	2	994	8	13.41	2.56	5.24	0.68	37.4	7.1	1.01	.315	2.67	55	2.12	48	6.52	63.9
4	Nolan Ryan N. Ryan	367	332.2	1974	CAL	42	22	16	.579	41	2.89	26	3	0	221	107	127	18	202	9	1	3	1,392	9	9.93	5.46	1.82	0.49	26.4	14.5	1.27	.255	3.44	85	2.97	84	5.98	20.2
5	Randy Johnson R. Johnson	364	271.2	1999	ARI	35	17	9	.654	35	2.48	12	2	0	207	75	86	30	70	9	0	3	1,079	4	12.06	2.32	5.20	0.99	33.7	6.5	1.02	.292	2.85	53	2.75	59	6.86	57.2
6	Bob Feller B. Feller	348	371.1	1946	CLE	48	26	15	.634	42	2.18	36	10	4	277	90	101	11	153	3	5		1,512	3	8.43	3.71	2.27	0.27	23.0	10.1	1.16	.267	2.45	65	2.16	65	6.71	48.3
7	Randy Johnson R. Johnson	347	248.2	2000	ARI	35	19	7	.731	35	2.64	8	3	0	202	73	89	23	76	6	0	1	1,001	5	12.56	2.75	4.57	0.83	34.7	7.6	1.12	.326	3.22	56	2.53	53	7.31	61.1
8	Nolan Ryan N. Ryan	341	299.0	1977	CAL	37	19	16	.543	37	2.77	22	4	0	198	92	110	12	204	9	0	7	1,272	21	10.26	6.14	1.67	0.36	26.8	16.0	1.34	.263	3.31	72	3.11	79	5.96	27.9
9	Randy Johnson R. Johnson	334	260.0	2002	ARI	35	24	5	.828	35	2.32	8	4	0	197	67	78	26	71	13	0	1	1,035	3	11.56	2.46	4.70	0.90	32.3	6.9	1.03	.289	2.70	54	2.65	61	6.82	47
10	Randy Johnson R. Johnson	329	244.1	1998	TOT	34	19	11	.633	34	3.28	10	6	0	203	89	102	23	86	14	0	1	1,014	7	12.12	3.17	3.83	0.85	32.4	8.5	1.18	.320	3.76	72	2.89	65	7.48	42.2
11	Nolan Ryan N. Ryan	329	284.0	1972	CAL	39	19	16	.543	39	2.28	20	9	0	166	72	80	14	157	10	0	4	1,154	18	10.43	4.98	2.10	0.44	28.5	13.6	1.14	.236	2.54	79	2.48	83	5.26	16.6
12	Nolan Ryan N. Ryan	327	284.1	1976	CAL	39	17	18	.486	39	3.36	21	7	0	193	106	117	13	183	5	0	2	1,196	5	10.35	5.79	1.79	0.41	27.3	15.3	1.32	.269	3.70	99	2.91	85	6.11	16.5
13	Gerrit Cole G. Cole	326	212.1	2019	HOU	33	20	5	.800	33	2.50	0	0	0	142	59	66	29	48	3	0	0	817	4	13.82	2.03	6.79	1.23	39.9	5.9	0.89	.275	2.80	55	2.63	58	6.02	45
14	Sam McDowell S. McDowell	325	273.0	1965	CLE	42	17	11	.607	35	2.18	14	3	4	178	66	80	9	132	6	5	7	1,116	17	10.71	4.35	2.46	0.30	29.1	11.8	1.14	.262	2.64	63	2.08	58	5.87	45.4
15	Curt Schilling C. Schilling	319	254.1	1997	PHI	35	17	11	.607	35	2.97	7	2	0	208	84	96	25	58	5	0	3	1,009	5	11.29	2.05	5.50	0.88	31.6	5.7	1.05	.304	3.40	69	2.61	62	7.36	45.8
16	Sandy Koufax S. Koufax	317	323.0	1966	LAD	41	27	9	.750	41	1.73	27	5	0	241	62	74	19	77	0	0	4	1,274	7	8.83	2.15	4.12	0.53	24.9	6.0	0.98	.258	2.06	53	2.07	65	6.72	41.8
17	Curt Schilling C. Schilling	316	259.1	2002	ARI	36	23	7	.767	35	3.23	5	1	0	218	93	95	29	33	3	0	1	1,017	6	10.97	1.15	9.58	1.01	31.1	3.2	0.97	.297	3.30	75	2.39	55	7.57	54.3
18	Pedro Martinez P. Martinez	313	213.1	1999	BOS	31	23	4	.852	29	2.07	5	1	0	160	49	56	9	37	9	1	1	835	6	13.20	1.56	8.46	0.38	37.5	4.4	0.92	.323	2.36	42	1.38	30	6.75	79.4
19	J.R. Richard	313	292.1	1979	HOU	38	18	13	.581	38	2.71	19	4	0	220	88	98	13	98	3	0	5	1,175	19	9.64	3.02	3.19	0.40	26.6	8.3	1.09	.277	3.02	78	2.19	62	6.77	45.6
20	Steve Carlton S. Carlton	310	346.1	1972	PHI	41	27	10	.730	41	1.97	30	8	0	257	76	84	17	87	1	0	8	1,351	8	8.06	2.26	3.56	0.44	22.9	6.4	0.99	.256	2.18	56	2.00	59	6.68	53.5
21	Chris Sale C. Sale	308	214.1	2017	BOS	32	17	8	.680	32	2.90	1	0	0	165	69	73	24	43	8	0	0	851	3	12.93	1.81	7.16	1.01	36.2	5.1	0.97	.301	3.07	63	2.45	56	6.93	45.5
22	Randy Johnson R. Johnson	308	255.1	1993	SEA	35	19	8	.704	34	3.24	10	3	1	185	92	97	22	99	16	1	1	1,043	8	10.86	3.49	3.11	0.78	29.5	9.5	1.11	.273	3.42	74	3.04	70	6.52	36.2
23	Mickey Lolich M. Lolich	308	376.0	1971	DET	45	25	14	.641	45	2.92	29	4	0	336	122	133	36	92	7	0	2	1,538	7	7.37	2.20	3.35	0.86	20.0	6.0	1.14	.274	3.18	83	2.84	78	8.04	32.5
24	Mike Scott M. Scott	306	275.1	1986	HOU	37	18	10	.643	37	2.22	7	5	0	182	68	73	17	72	2	0	6	1,065	3	10.00	2.35	4.25	0.56	28.7	6.8	0.92	.247	2.39	63	2.15	61	5.95	43.6
25	Sandy Koufax S. Koufax	306	311.0	1963	LAD	40	25	5	.833	40	1.88	20	11	0	214	65	68	18	58	3	0	7	1,210	6	8.86	1.68	5.28	0.52	25.3	4.8	0.87	.238	1.97	62	1.85	62	6.19	41.9