Bob Feller had the best K/9 in 1939, with 7.46 per nine innings.

Interpreted as:

highest k/9 with a minimum of 1 IP per team game by a player in 1939

	NAME	K/9	SEASON	TM	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	TBF	WP	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Bob Feller B. Feller	7.46	1939	CLE	39	24	9	.727	35	2.85	246	24	4	1	296.2	227	94	105	13	142	3	3	1,243	14	4.31	1.73	0.39	19.8	11.4	1.24	.255	3.19	64	3.35	78	6.89	32.4
2	Bobo Newsom B. Newsom	5.92	1939	TOT	41	20	11	.645	37	3.58	192	24	3	2	291.2	272	116	126	19	126	3	4	1,261	4	3.89	1.52	0.59	15.2	10.0	1.36	.275	3.89	73	3.83	81	8.39	28
3	Tommy Bridges T. Bridges	5.86	1939	DET	29	17	7	.708	26	3.50	129	16	2	2	198.0	186	77	87	11	61	6	2	840	4	2.77	2.11	0.50	15.4	7.3	1.25	.276	3.95	71	3.41	72	8.45	28.1
4	Mort Cooper M. Cooper	5.55	1939	SLN	45	12	6	.667	26	3.25	130	7	2	5	210.2	208	76	94	6	97	2	12	919	4	4.14	1.34	0.26	14.1	10.6	1.45	.295	4.02	79	3.52	82	8.89	17.7
5	Johnny Rigney J. Rigney	4.90	1939	CWS	35	15	8	.652	29	3.70	119	11	2	0	218.2	208	90	103	10	84	2	4	946	3	3.46	1.42	0.41	12.6	8.9	1.34	.271	4.24	81	3.66	83	8.56	18.3
6	Vito Tamulis V. Tamulis	4.71	1939	BKN	39	9	8	.529	17	4.37	83	8	1	4	158.2	177	77	81	10	45	8	14	689	6	2.55	1.84	0.57	12.0	6.5	1.40	.308	4.59	108	3.75	89	10.04	8.1
7	Lefty Gomez L. Gomez	4.64	1939	NYY	26	12	8	.600	26	3.41	102	14	2	0	198.0	173	75	80	11	84	3	0	831	3	3.82	1.21	0.50	12.3	10.1	1.30	.257	3.64	77	3.98	93	7.86	6.2
8	Ken Chase K. Chase	4.58	1939	WSH	32	10	19	.345	31	3.80	118	15	1	0	232.0	215	98	116	10	114	1	1	1,019	11	4.42	1.04	0.39	11.6	11.2	1.42	.264	4.50	87	4.00	95	8.34	5.4
9	Joe Krakauskas J. Krakauskas	4.56	1939	WSH	39	11	17	.393	29	4.60	110	12	0	1	217.1	230	111	125	13	114	1	8	966	5	4.72	0.96	0.54	11.4	11.8	1.58	.298	5.18	105	4.33	102	9.52	-3.1
10	Larry French L. French	4.55	1939	CHC	36	15	8	.652	21	3.29	98	10	2	1	194.0	205	71	80	7	50	1	11	828	5	2.32	1.96	0.32	11.8	6.0	1.31	.295	3.71	84	3.22	79	9.51	18.5
11	Claude Passeau C. Passeau	4.49	1939	TOT	42	15	13	.536	35	3.28	137	17	2	3	274.1	269	100	112	9	73	5	6	1,150	0	2.39	1.88	0.30	11.9	6.3	1.25	.281	3.67	84	3.25	80	8.83	25.2
12	Bob Bowman B. Bowman	4.15	1939	SLN	51	13	5	.722	15	2.60	78	4	2	8	169.1	141	49	54	8	60	1	19	692	3	3.19	1.30	0.43	11.3	8.7	1.19	.244	2.87	63	3.75	87	7.49	10.2
13	Cliff Melton C. Melton	4.12	1939	NYG	41	12	15	.444	23	3.56	95	9	2	5	207.1	214	82	94	7	65	4	13	886	2	2.82	1.46	0.30	10.7	7.3	1.35	.290	4.08	90	3.49	85	9.29	14.4
14	Kirby Higbe K. Higbe	4.07	1939	TOT	43	12	15	.444	28	4.67	95	14	1	2	210.0	220	109	122	10	123	10	13	965	7	5.27	0.77	0.43	9.8	12.7	1.63	.289	5.23	119	4.59	112	9.43	-11.9
15	Johnny Allen J. Allen	4.06	1939	CLE	28	9	7	.563	26	4.58	79	9	2	0	175.0	199	89	96	9	56	3	2	763	5	2.88	1.41	0.46	10.4	7.3	1.46	.308	4.94	102	3.75	87	10.23	11.1
16	Jack Wilson J. Wilson	4.06	1939	BSA	36	11	11	.500	22	4.67	80	6	0	2	177.1	198	92	109	10	75	1	5	797	4	3.81	1.07	0.51	10.0	9.4	1.54	.298	5.53	98	4.09	89	10.05	9.9
17	Dizzy Trout D. Trout	4.00	1939	DET	33	9	10	.474	22	3.61	72	6	0	2	162.0	168	65	82	5	74	4	6	716	5	4.11	0.97	0.28	10.1	10.3	1.49	.291	4.56	74	3.93	83	9.33	14.1
18	Whitey Moore W. Moore	3.88	1939	CIN	42	13	12	.520	24	3.45	81	9	2	3	187.2	177	72	88	10	95	6	11	819	3	4.56	0.85	0.48	9.9	11.6	1.45	.266	4.22	91	4.42	112	8.49	-10.3
19	Bucky Walters B. Walters	3.87	1939	CIN	39	27	11	.711	36	2.29	137	31	2	0	319.0	250	81	98	15	109	6	2	1,283	8	3.08	1.26	0.42	10.7	8.5	1.13	.231	2.76	60	3.81	96	7.05	4.8
20	Paul Derringer P. Derringer	3.83	1939	CIN	38	25	7	.781	35	2.93	128	28	5	0	301.0	321	98	115	15	35	3	1	1,245	2	1.05	3.66	0.45	10.3	2.8	1.18	.288	3.44	77	3.15	80	9.60	27.2
21	Boom-Boom Beck B. Beck	3.82	1939	PHN	34	7	14	.333	16	4.62	77	12	0	4	181.1	200	93	101	11	64	3	13	805	1	3.18	1.20	0.55	9.6	8.0	1.46	.291	5.01	118	4.02	99	9.93	1.2
22	Lefty Grove L. Grove	3.82	1939	BSA	23	15	4	.789	23	2.54	81	17	2	0	191.0	180	54	63	8	58	1	0	798	0	2.73	1.40	0.38	10.2	7.3	1.25	.265	2.97	53	3.60	78	8.48	20.9
23	Bump Hadley B. Hadley	3.80	1939	NYY	26	12	6	.667	18	2.98	65	7	1	2	154.0	132	51	62	10	85	3	6	658	4	4.97	0.76	0.58	9.9	12.9	1.41	.246	3.62	67	4.69	110	7.71	-7.7
24	Red Ruffing R. Ruffing	3.66	1939	NYY	28	21	7	.750	28	2.93	95	22	5	0	233.1	211	76	88	15	75	2	0	968	3	2.89	1.27	0.58	9.8	7.7	1.23	.251	3.39	66	3.98	93	8.14	7.2
25	Carl Hubbell C. Hubbell	3.62	1939	NYG	29	11	9	.550	18	2.75	62	10	0	2	154.0	150	47	60	11	24	2	8	639	2	1.40	2.58	0.64	9.7	3.8	1.13	.257	3.51	69	3.60	87	8.77	8.9