Since 1950, Hank Wyse has the worst K/9 in a season, with 1.74 per nine innings in 1950.

Interpreted as:

lowest single season k/9 with a minimum of 1 IP per team game by a player since 1950

	NAME	K/9	SEASON	TM	G	W	L	W%	GS	ERA	SO	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	Hank Wyse H. Wyse	1.74	1950	PHA	41	9	14	.391	23	5.85	33	4	0	0	170.2	192	111	121	16	87	8	9		772	0	4.59	0.38	0.84	4.3	11.3	1.63	.280	6.38	127	5.09	113	10.13	-11
2	Spec Shea S. Shea	2.08	1953	WSH	23	12	7	.632	23	3.94	38	11	1	0	164.2	151	72	82	11	75	4	0		706	3	4.10	0.51	0.60	5.4	10.6	1.37	.242	4.48	102	4.44	114	8.25	-10.4
3	Nate Cornejo N. Cornejo	2.13	2003	DET	32	6	17	.261	32	4.67	46	2	0	0	194.2	236	101	111	18	58	3	0	8	842	1	2.68	0.79	0.83	5.5	6.9	1.51	.304	5.13	106	4.69	106	10.91	-6.2
4	Bob Shaw B. Shaw	2.15	1960	CWS	36	13	13	.500	32	4.06	46	7	1	0	192.2	221	87	97	16	62	3	2	3	840	0	2.90	0.74	0.75	5.5	7.4	1.47	.288	4.53	108	4.14	107	10.32	-6.2
5	Stubby Overmire S. Overmire	2.18	1950	SLA	31	9	12	.429	19	4.19	39	8	2	0	161.0	200	75	89	11	45	1	4		722	1	2.52	0.87	0.61	5.4	6.2	1.52	.302	4.98	87	3.85	82	11.18	14.5
6	Ross Grimsley R. Grimsley	2.18	1977	BAL	34	14	10	.583	34	3.96	53	11	2	0	218.1	230	96	105	24	74	1	0	2	923	2	3.05	0.72	0.99	5.7	8.0	1.39	.267	4.33	105	4.70	121	9.48	-20.9
7	Ken Holcombe K. Holcombe	2.20	1951	CWS	28	11	12	.478	23	3.78	39	12	2	0	159.1	142	67	69	9	68	1	3		670	2	3.84	0.57	0.51	5.8	10.1	1.32	.241	3.90	94	4.02	102	8.02	-1.6
8	Steve Kline S. Kline	2.21	1972	NYY	32	16	9	.640	32	2.40	58	11	4	0	236.1	210	63	79	11	44	10	0	6	956	1	1.68	1.32	0.42	6.1	4.6	1.07	.239	3.01	83	3.19	105	8.00	-5
9	Bill Lee B. Lee	2.24	1978	BOS	28	10	10	.500	24	3.46	44	8	1	0	177.0	198	68	89	20	59	2	3	2	768	0	3.00	0.75	1.02	5.7	7.7	1.45	.277	4.53	86	4.58	117	10.07	-12.4
10	Howie Fox H. Fox	2.25	1951	CIN	40	9	14	.391	30	3.83	57	9	4	2	228.0	239	97	105	16	69	2	5		958	2	2.72	0.83	0.63	5.9	7.2	1.35	.274	4.14	97	3.83	94	9.43	5.8
11	Ed Lynch E. Lynch	2.27	1983	NYM	30	10	10	.500	27	4.28	44	1	0	0	174.2	208	83	94	17	41	3	1	10	749	3	2.11	1.07	0.88	5.9	5.5	1.43	.297	4.84	119	4.26	117	10.72	-12.6
12	Bob Miller B. Miller	2.28	1950	PHN	35	11	6	.647	21	3.57	44	7	2	1	174.0	190	69	78	9	57	5	7		755	5	2.95	0.77	0.47	5.8	7.5	1.42	.283	4.03	89	3.82	92	9.83	6.1
13	Clyde Wright C. Wright	2.28	1973	CAL	37	11	19	.367	36	3.68	65	13	1	0	257.0	273	105	120	26	76	3	1	0	1,102	4	2.66	0.86	0.91	5.9	6.9	1.36	.265	4.20	103	4.29	120	9.56	-22.7
14	Mike Caldwell M. Caldwell	2.29	1983	MIL	32	12	11	.522	32	4.53	58	10	2	0	228.1	269	115	125	35	51	1	0	1	970	3	2.01	1.14	1.38	6.0	5.3	1.40	.284	4.93	116	4.91	128	10.60	-29
15	Bob Stanley B. Stanley	2.33	1979	BOS	40	16	12	.571	30	3.99	56	9	4	1	216.2	250	96	110	14	44	4	7	4	914	0	1.83	1.27	0.58	6.1	4.8	1.36	.296	4.57	88	3.71	86	10.38	14.4
16	Tommy John T. John	2.33	1984	CAL	32	7	13	.350	29	4.52	47	4	1	0	181.1	223	91	97	15	56	4	1	3	797	11	2.78	0.84	0.74	5.9	7.0	1.54	.308	4.81	114	4.31	105	11.07	-4.1
17	Paul Splittorff P. Splittorff	2.34	1980	KCR	34	14	11	.560	33	4.15	53	4	0	0	204.0	236	94	101	17	43	1	0	1	861	1	1.90	1.23	0.75	6.2	5.0	1.37	.293	4.46	102	3.95	100	10.41	-0.4
18	Jim Konstanty J. Konstanty	2.37	1953	PHN	48	14	10	.583	19	4.43	45	7	0	5	170.2	198	84	90	18	42	3	20		735	1	2.21	1.07	0.95	6.1	5.7	1.41	.287	4.75	105	4.23	101	10.44	-1.2
19	Bill Lee B. Lee	2.39	1979	MON	33	16	10	.615	33	3.04	59	6	3	0	222.0	230	75	91	20	46	1	0	1	925	0	1.86	1.28	0.81	6.4	5.0	1.24	.263	3.69	83	3.99	108	9.32	-7.8
20	Carl Scheib C. Scheib	2.39	1952	PHA	30	11	7	.611	19	4.39	42	8	1	2	158.0	153	77	82	21	50	4	11		667	4	2.85	0.84	1.20	6.3	7.5	1.28	.240	4.67	116	4.61	121	8.72	-13.4
21	Ken Holtzman K. Holtzman	2.41	1976	TOT	34	14	11	.560	34	3.65	66	16	3	0	246.2	265	100	108	18	70	1	0	2	1,041	10	2.55	0.94	0.66	6.3	6.7	1.36	.279	3.94	108	3.91	113	9.67	-12.4
22	Lary Sorensen L. Sorensen	2.41	1979	MIL	34	15	14	.517	34	3.98	63	16	2	0	235.1	250	104	113	30	42	4	0	3	967	3	1.61	1.50	1.15	6.5	4.3	1.24	.266	4.32	96	4.43	109	9.56	-10.4
23	Glenn Abbott G. Abbott	2.42	1981	SEA	22	4	9	.308	20	3.94	35	1	0	0	130.1	127	57	64	14	28	0	1	1	530	1	1.93	1.25	0.97	6.6	5.3	1.19	.249	4.42	104	4.10	103	8.77	-1.2
24	Bill Swift B. Swift	2.42	1988	SEA	38	8	12	.400	24	4.59	47	6	1	0	174.2	199	89	99	10	65	8	4	3	757	6	3.35	0.72	0.52	6.2	8.6	1.51	.301	5.10	111	4.22	103	10.25	-1.6
25	Paul Hartzell P. Hartzell	2.43	1979	MIN	28	6	10	.375	26	5.36	44	4	0	0	163.0	193	97	102	18	44	4	0	4	704	1	2.43	1.00	0.99	6.3	6.3	1.45	.295	5.63	123	4.50	108	10.66	-5.7