lowest earned run average by a pitcher before turning 25 with at least 75 games started

Walter Johnson has the best career ERA by a pitcher younger than 25 when starting 75+ games, with an ERA of 0.08.

Interpreted as:

lowest earned run average by a pitcher before turning 25 years old with at least 75 games started

	NAME	ERA	GS	G	W	L	W%	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Walter Johnson W. Johnson	0.08	182	211	110	81	.576	1,156	158	31	6	1614.2	1,256		487	12	360	66	28			74	6.44	2.01	3.21	0.07		5.7	1.00	.261	2.71	7.00
2	Jim Scott J. Scott	0.18	85	125	38	44	.463	437	50	10	1	760.2	632		290	8	283	28	33		3,065	19	5.17	3.35	1.54	0.09	14.3	9.2	1.20	.270	3.43	7.48
3	Joe Wood J. Wood	0.59	141	193	102	51	.667	933	111	25	6	1257.2	992		453	9	369	51	45			40	6.68	2.64	2.53	0.06		7.3	1.08	.266	3.24	7.10
4	Doc Crandall D. Crandall	0.73	75	183	63	32	.663	364	46	4	18	906.2	887		394	35	224	25	102			6	3.61	2.22	1.63	0.35		6.0	1.23	.273	3.91	8.80
5	George Kahler G. Kahler	1.01	77	109	32	43	.427	285	41	5	2	626.1	629		314	3	273	33	23		2,666	14	4.10	3.92	1.04	0.04	10.7	10.2	1.44	.302	4.51	9.04
6	Willie Mitchell W. Mitchell	1.34	112	171	50	57	.467	603	61	8	2	1021.1	898		462	8	398	56	44			36	5.31	3.51	1.52	0.07		9.3	1.27	.278	4.07	7.91
7	Bob Harmon B. Harmon	1.46	125	158	60	60	.500	360	68	5	6	1018.2	964		529	21	496	17	25			28	3.18	4.38	0.73	0.19		11.4	1.43	.274	4.67	8.52
8	Earl Hamilton E. Hamilton	1.85	140	195	57	77	.425	487	83	11	5	1221.0	1,149		556	19	442	49	37		5,086	25	3.59	3.26	1.10	0.14	9.6	8.7	1.30	.276	4.10	8.47
9	Dutch Leonard D. Leonard	2.03	110	159	67	41	.620	583	59	18	10	949.2	764	214	288	12	291	38	40		3,808	18	5.53	2.76	2.00	0.11	15.3	7.6	1.11	.261	2.73	7.24
10	Babe Ruth B. Ruth	2.19	143	158	89	46	.659	495	105	17	4	1190.1	934		376	9	433	29	11			27	3.74	3.27	1.14	0.07		9.0	1.15	.239	2.84	7.06
11	Bill Doak B. Doak	2.34	82	90	37	32	.536	293	40	11	3	627.1	539	163	226	10	213	20	8		2,560	13	4.20	3.06	1.38	0.14	11.4	8.3	1.20	.261	3.24	7.73
12	George Baumgardner G. Baumgardner	2.36	79	124	38	49	.437	282	51	7	2	687.2	684		315	10	264	30	37		2,894	11	3.69	3.46	1.07	0.13	9.7	9.1	1.38	.292	4.12	8.95
13	Tom Seaver T. Seaver	2.38	104	107	57	32	.640	583	50	12	1	802.1	650	212	233	58	208	20	3	20	3,206	20	6.54	2.33	2.80	0.65	18.2	6.5	1.07	.253	2.61	7.29
14	Wilbur Cooper W. Cooper	2.45	90	156	41	45	.477	355	52	6	6	828.2	745		322	13	264	20	47			20	3.86	2.87	1.34	0.14		7.7	1.22	.263	3.50	8.09
15	Jose Fernandez J. Fernandez	2.58	76	76	38	17	.691	589	0	0	0	471.1	357	135	150	31	140	13	0	12	1,888	16	11.25	2.67	4.21	0.59	31.2	7.4	1.05	.292	2.86	6.82
16	Guy Morton G. Morton	2.61	84	130	44	46	.489	406	40	8	4	745.2	667	216	301	10	250	11	30		3,052	15	4.90	3.02	1.62	0.12	13.3	8.2	1.23	.277	3.63	8.05
17	Dwight Gooden D. Gooden	2.64	175	177	100	39	.719	1,168	52	19	1	1291.0	1,053	379	423	65	379	18	1	17	5,215	26	8.14	2.64	3.08	0.45	22.4	7.3	1.11	.276	2.95	7.34
18	Pete Schneider P. Schneider	2.64	157	207	59	86	.407	487	85	10	5	1273.1	1,199		541	16	498	53	36			16	3.44	3.52	0.98	0.11		9.3	1.33	.274	3.82	8.47
19	Al Mamaux A. Mamaux	2.65	91	120	49	39	.557	381	53	11	2	744.1	623	219	295	8	325	23	26		3,095	11	4.61	3.93	1.17	0.10	12.3	10.5	1.27	.261	3.57	7.53
20	Jon Matlack J. Matlack	2.71	106	109	42	44	.488	593	36	14	0	788.1	677	237	272	40	261	9	2	39	3,243	20	6.77	2.98	2.27	0.46	18.3	8.0	1.19	.272	3.11	7.73
21	Frank Tanana F. Tanana	2.72	154	159	77	54	.588	1,010	79	21	0	1212.0	1,034	366	407	105	322	39	3	22	4,927	30	7.50	2.39	3.14	0.78	20.5	6.5	1.12	.269	3.02	7.68
22	Steve Carlton S. Carlton	2.72	103	119	47	34	.580	586	35	10	1	738.1	655	223	253	41	242	10	7	13	3,051	26	7.14	2.95	2.42	0.50	19.2	7.9	1.21	.283	3.08	7.98
23	Joe Boehling J. Boehling	2.73	81	108	44	28	.611	311	46	7	4	666.2	598		265	11	280	31	21			18	4.20	3.78	1.11	0.15		10.1	1.32	.273	3.58	8.07
24	Tommy John T. John	2.76	114	143	44	42	.512	495	30	13	2	759.1	654	233	280	50	216	16	6	23	3,092	30	5.87	2.56	2.29	0.59	16.0	7.0	1.15	.261	3.32	7.75
25	Harry Harper H. Harper	2.77	141	184	48	58	.453	529	51	11	5	1037.1	888		431	12	496	34	24			52	4.59	4.30	1.07	0.10		11.4	1.33	.266	3.74	7.70