best k/9 with a minimum of 1000 innings pitched as a pitcher in the 1930s

Between the 1930 and 1939 seasons, Dizzy Dean had the best K/9 when pitching at least 1000 innings, with 5.40 per nine innings.

	NAME	K/9	IP	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	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	Dizzy Dean D. Dean	5.40	1908.1	305	147	80	.648	219	2.96	1,144	151	26	31	1,845	628	736	91	432	27	76	7,903	12	2.04	2.65	0.43	14.5	5.5	1.19	.282	3.47	75	3.19	78	8.70	192.3
2	Lefty Gomez L. Gomez	5.38	2234.2	322	165	89	.650	278	3.24	1,337	163	26	10	2,031	804	949	122	904	15	28	9,505	30	3.64	1.48	0.49	14.1	9.5	1.31	.268	3.82	75	3.79	90	8.18	98
3	Johnny Allen J. Allen	5.36	1406.1	212	108	45	.706	182	3.73	838	94	12	4	1,323	583	654	66	547	27	22	5,970	50	3.50	1.53	0.42	14.0	9.2	1.33	.280	4.19	84	3.67	85	8.47	102.6
4	Van Mungo V. Mungo	5.36	1715.1	275	101	99	.505	215	3.42	1,022	114	16	13	1,593	652	771	73	685	23	48	7,313	44	3.59	1.49	0.38	14.0	9.4	1.33	.276	4.05	89	3.65	92	8.36	63.8
5	Tommy Bridges T. Bridges	5.22	2083.0	309	150	102	.595	266	3.76	1,207	156	25	8	2,015	870	1,021	138	902	29	32	9,033	41	3.90	1.34	0.60	13.4	10.0	1.40	.278	4.41	81	4.10	91	8.71	93.4
6	Bobo Newsom B. Newsom	5.13	1689.2	254	100	94	.515	213	4.39	963	129	12	13	1,707	824	931	106	879	22	29	7,481	32	4.68	1.10	0.56	12.9	11.7	1.53	.291	4.96	92	4.33	93	9.09	62
7	Lefty Grove L. Grove	4.93	2399.0	351	199	76	.724	268	2.91	1,313	197	26	31	2,344	776	907	93	639	22	72	10,054	16	2.40	2.05	0.35	13.1	6.4	1.24	.282	3.40	62	3.33	73	8.79	326
8	Red Ruffing R. Ruffing	4.65	2439.0	334	175	98	.641	298	3.59	1,260	201	28	9	2,327	972	1,123	150	858	24	31	10,351	24	3.17	1.47	0.55	12.2	8.3	1.31	.270	4.14	83	3.93	93	8.59	77.1
9	Monte Pearson M. Pearson	4.53	1295.2	201	92	53	.634	171	4.00	652	86	4	4	1,262	576	658	71	681	6	21	5,687	40	4.73	0.96	0.49	11.5	12.0	1.50	.278	4.57	88	4.34	98	8.77	9.7
10	Pat Malone P. Malone	4.53	1397.1	275	94	69	.577	164	3.93	703	79	8	23	1,433	610	717	76	504	33	86	6,076	35	3.25	1.39	0.49	11.6	8.3	1.39	.285	4.62	96	3.99	96	9.23	26.6
11	Tex Carleton T. Carleton	4.44	1458.1	259	94	70	.573	185	3.92	720	87	15	6	1,490	635	702	93	514	35	54	6,296	37	3.17	1.40	0.57	11.4	8.2	1.37	.283	4.33	101	3.99	99	9.20	5.4
12	Carl Hubbell C. Hubbell	4.44	2596.2	383	188	104	.644	303	2.71	1,281	197	31	30	2,437	782	917	147	467	39	66	10,584	34	1.62	2.74	0.51	12.1	4.4	1.12	.265	3.18	69	3.42	86	8.45	163.9
13	George Earnshaw G. Earnshaw	4.41	1502.1	249	96	78	.552	194	4.63	736	95	12	10	1,605	773	872	127	584	19	36	6,622	40	3.50	1.26	0.76	11.1	8.8	1.46	.287	5.22	105	4.48	102	9.62	-13.4
14	Bill Hallahan B. Hallahan	4.39	1574.2	279	96	86	.527	209	4.02	768	85	14	7	1,685	704	831	64	676	7	37	6,926	65	3.86	1.14	0.37	11.1	9.8	1.50	.300	4.75	100	3.96	96	9.63	35.3
15	Schoolboy Rowe S. Rowe	4.31	1126.2	189	80	53	.602	143	4.11	540	77	15	7	1,187	515	581	69	325	9	34	4,803	13	2.60	1.66	0.55	11.2	6.8	1.34	.290	4.64	89	3.80	84	9.48	88.5
16	Bump Hadley B. Hadley	4.27	2121.2	374	121	119	.504	257	4.21	1,006	98	10	20	2,127	992	1,147	133	1,061	38	78	9,372	50	4.50	0.95	0.56	10.7	11.3	1.50	.280	4.87	92	4.50	101	9.02	-13.9
17	Roy Parmelee R. Parmelee	4.15	1113.1	204	58	55	.513	144	4.24	513	55	5	3	1,062	525	598	67	528	54	40	4,882	53	4.27	0.97	0.54	10.5	10.8	1.43	.267	4.83	109	4.49	112	8.59	-65.6
18	Charlie Root C. Root	4.02	1829.1	377	114	89	.562	187	3.50	818	96	10	30	1,870	711	812	114	466	47	123	7,716	15	2.29	1.76	0.56	10.6	6.0	1.28	.280	3.99	89	3.83	95	9.20	43.2
19	Claude Passeau C. Passeau	4.02	1026.0	186	51	65	.440	124	3.94	458	58	5	9	1,152	449	539	40	302	22	47	4,493	5	2.65	1.52	0.35	10.2	6.7	1.42	.303	4.73	95	3.60	84	10.11	81.2
20	Bob Weiland B. Weiland	3.97	1316.1	260	59	90	.396	169	4.18	580	64	6	6	1,391	611	749	81	563	33	44	5,822	10	3.85	1.03	0.55	10.0	9.7	1.48	.287	5.12	99	4.27	101	9.51	-7.5
21	Paul Derringer P. Derringer	3.91	2343.2	375	148	137	.519	285	3.50	1,018	163	23	18	2,584	911	1,083	93	481	27	68	9,948	40	1.85	2.12	0.36	10.2	4.8	1.31	.299	4.16	92	3.33	85	9.92	156.7
22	Lon Warneke L. Warneke	3.91	2021.0	318	144	85	.629	247	3.23	877	146	24	11	1,993	725	845	126	555	21	46	8,471	45	2.47	1.58	0.56	10.4	6.6	1.26	.271	3.76	83	3.83	96	8.88	35.3
23	Bill Walker B. Walker	3.79	1231.2	218	80	64	.556	161	3.57	518	69	14	10	1,303	489	591	79	445	23	33	5,384	14	3.25	1.16	0.58	9.6	8.3	1.42	.283	4.32	88	4.27	103	9.52	-17
24	Syl Johnson S. Johnson	3.70	1380.1	327	65	85	.433	141	4.09	567	53	8	30	1,485	628	703	117	250	23	115	5,790	13	1.63	2.27	0.76	9.8	4.3	1.26	.283	4.58	96	3.98	91	9.68	65
25	Bill Lee B. Lee	3.67	1570.2	240	106	70	.602	201	3.21	640	110	23	8	1,562	560	645	84	483	13	24	6,590	31	2.77	1.33	0.48	9.7	7.3	1.30	.275	3.70	82	3.88	96	8.95	30.1