Between the 1925 and 1941 seasons, Lefty Grove pitched the most innings, with 3940.2 innings.

Interpreted as:

most ip by a player 1925 to 1941

	NAME	IP	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	H	ER	R	HR	BB	HBP	GF	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Lefty Grove L. Grove	3940.2	616	300	141	.680	457	3.06	2,266	298	35	54	3,849	1,339	1,594	162	1,187	42	123	16,622	51	5.18	2.71	1.91	0.37	13.6	7.1	1.28	.284	3.64	68	3.36	76	8.79	462.8
2	Red Ruffing R. Ruffing	3926.0	564	244	209	.539	484	3.83	1,843	306	38	18	3,887	1,671	1,942	233	1,432	51	66	16,818	42	4.22	3.28	1.29	0.53	11.0	8.5	1.35	.276	4.45	90	4.00	96	8.91	71.4
3	Ted Lyons T. Lyons	3699.0	519	231	208	.526	436	3.67	955	319	26	22	3,975	1,510	1,823	197	999	26	72	15,810	45	2.32	2.43	0.96	0.48	6.0	6.3	1.34	.277	4.44	85	4.04	95	9.67	92.5
4	Carl Hubbell C. Hubbell	3367.0	499	238	142	.626	402	2.89	1,585	246	36	33	3,216	1,083	1,269	203	667	52	81	13,846	47	4.24	1.78	2.38	0.54	11.4	4.8	1.15	.266	3.39	73	3.53	88	8.60	181.4
5	Earl Whitehill E. Whitehill	3298.2	498	199	176	.531	438	4.41	1,266	209	14	11	3,635	1,616	1,879	182	1,337	85	42	14,616	42	3.45	3.65	0.95	0.50	8.7	9.1	1.51	.294	5.13	100	4.31	99	9.92	7.4
6	Freddie Fitzsimmons F. Fitzsimmons	3176.0	503	214	142	.601	416	3.47	858	185	30	13	3,279	1,225	1,471	180	824	32	63	13,353	58	2.43	2.34	1.04	0.51	6.4	6.2	1.29	.270	4.17	88	4.04	101	9.29	-14
7	Charlie Root C. Root	3137.1	605	201	156	.563	339	3.55	1,432	177	21	42	3,184	1,236	1,422	185	871	73	171	13,266	21	4.11	2.50	1.64	0.53	10.8	6.6	1.29	.280	4.08	90	3.78	94	9.13	85.7
8	Larry French L. French	3004.1	532	182	167	.521	369	3.52	1,125	191	36	17	3,248	1,176	1,401	163	783	37	98	12,869	33	3.37	2.35	1.44	0.49	8.7	6.1	1.34	.287	4.20	89	3.82	94	9.73	84.7
9	Bump Hadley B. Hadley	2945.2	528	161	165	.494	355	4.24	1,318	134	14	25	2,980	1,389	1,609	167	1,442	63	108	13,016	72	4.03	4.41	0.91	0.51	10.1	11.1	1.50	.281	4.92	96	4.42	102	9.10	-27.9
10	Paul Derringer P. Derringer	2868.2	441	180	163	.525	350	3.44	1,209	206	28	19	3,097	1,096	1,284	126	583	27	69	12,103	43	3.79	1.83	2.07	0.40	10.0	4.8	1.28	.292	4.03	91	3.35	86	9.72	177.1
11	Danny MacFayden D. MacFayden	2684.2	455	130	158	.451	333	3.95	792	158	18	9	2,950	1,177	1,380	111	863	63	70	11,667	20	2.66	2.89	0.92	0.37	6.8	7.4	1.42	.289	4.63	99	4.07	102	9.89	-28.4
12	Mel Harder M. Harder	2647.2	465	176	140	.557	321	3.87	929	140	16	24	2,921	1,138	1,364	131	825	51	93	11,540	25	3.16	2.80	1.13	0.45	8.1	7.1	1.41	.291	4.64	85	3.97	90	9.93	137.7
13	Guy Bush G. Bush	2636.0	521	174	131	.570	300	3.84	811	147	16	33	2,853	1,126	1,311	144	832	39	138	11,376	49	2.77	2.84	0.97	0.49	7.1	7.3	1.40	.284	4.48	95	4.16	102	9.74	-31.1
14	Wes Ferrell W. Ferrell	2623.0	374	193	128	.601	323	4.04	985	227	17	13	2,845	1,177	1,382	132	1,040	23	43	11,568	35	3.38	3.57	0.95	0.45	8.5	9.0	1.48	.289	4.74	87	4.23	93	9.76	97.5
15	Willis Hudlin W. Hudlin	2611.1	490	158	155	.505	328	4.41	676	155	11	31	3,008	1,280	1,491	118	846	44	104	11,512	41	2.33	2.92	0.80	0.41	5.9	7.3	1.48	.294	5.14	98	4.16	94	10.37	75
16	Rube Walberg R. Walberg	2517.0	510	151	133	.532	294	4.09	1,043	135	15	34	2,659	1,144	1,334	153	960	25	134	10,957	38	3.73	3.43	1.09	0.55	9.5	8.8	1.44	.286	4.77	92	4.21	97	9.51	46.6
17	Waite Hoyt W. Hoyt	2501.2	475	154	123	.556	280	3.67	803	143	16	44	2,721	1,021	1,217	118	635	27	130	10,704	25	2.89	2.28	1.26	0.42	7.5	5.9	1.34	.285	4.38	90	3.84	94	9.79	61.8
18	Lon Warneke L. Warneke	2499.0	388	177	104	.630	308	3.21	1,045	175	29	11	2,455	892	1,048	162	684	27	53	10,454	48	3.76	2.46	1.53	0.58	10.0	6.5	1.26	.269	3.77	83	3.83	96	8.84	42.1
19	Red Lucas R. Lucas	2453.0	366	156	131	.544	298	3.68	569	203	22	6	2,615	1,003	1,138	131	433	16	52	10,248	7	2.09	1.59	1.31	0.48	5.6	4.2	1.24	.273	4.18	93	3.86	96	9.59	38.6
20	Tommy Bridges T. Bridges	2428.1	363	171	123	.582	316	3.71	1,430	178	28	8	2,314	1,000	1,176	159	1,060	30	35	10,506	48	5.30	3.93	1.35	0.59	13.6	10.1	1.39	.275	4.36	80	4.03	90	8.58	124.9
21	Lefty Gomez L. Gomez	2418.1	354	183	97	.654	306	3.31	1,427	171	28	10	2,219	889	1,045	134	1,025	17	31	10,351	38	5.31	3.81	1.39	0.50	13.8	9.9	1.34	.269	3.89	77	3.85	92	8.26	81.8
22	Alvin Crowder A. Crowder	2344.1	402	167	115	.592	292	4.12	799	150	16	22	2,453	1,072	1,204	137	800	16	71	10,070	20	3.07	3.07	1.00	0.53	7.9	7.9	1.39	.278	4.62	95	4.20	98	9.42	23.8
23	Ed Brandt E. Brandt	2268.1	378	121	146	.453	278	3.86	877	150	18	17	2,342	974	1,084	134	778	35	70	9,721	25	3.48	3.09	1.13	0.53	9.0	8.0	1.38	.280	4.30	100	4.14	105	9.29	-64.4
24	Bob Smith B. Smith	2246.1	435	106	139	.433	229	3.94	618	128	16	41	2,472	983	1,139	132	670	18	157	9,651	11	2.48	2.68	0.92	0.53	6.4	6.9	1.40	.285	4.56	101	4.22	106	9.90	-74
25	Bobo Newsom B. Newsom	2213.1	336	133	122	.522	285	4.25	1,308	161	17	15	2,222	1,046	1,193	140	1,102	28	35	9,759	37	5.32	4.48	1.19	0.57	13.4	11.3	1.50	.290	4.85	90	4.16	90	9.04	111.5