lowest era for a pitcher in their first 6 seasons with at least 300 ip

Craig Kimbrel had the lowest ERA by a pitcher when pitching at least 300 innings in his first 6 seasons, with an ERA of 1.63.

	NAME	ERA	IP	G	W	L	W%	GS	SO	CG	SHO	SV	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Craig Kimbrel C. Kimbrel	1.63	348.1	355	19	12	.613	0	563	0	0	225	193	63	70	18	130	9	294	5	1,366	26	14.55	3.36	4.33	0.47	41.2	9.5	0.93	.271	1.81	44	1.71	46	4.99	79.8
2	Ed Walsh E. Walsh	1.68	1642.1	234	110	63	.636	175	901	138	36	15	1,276	307	464	7	312	34	54		6,282	51	4.94	1.71	2.89	0.04	14.3	5.0	0.97	.252	2.54	70	1.83	80	6.99	74.3
3	Walter Johnson W. Johnson	1.69	1724.1	225	115	90	.561	194	1,218	169	33	6	1,354	324	522	13	379	65	30		6,722	78	6.36	1.98	3.21	0.07	18.1	5.6	1.01	.266	2.72	63	1.92	72	7.07	145.6
4	Mordecai Brown M. Brown	1.70	1485.0	196	117	56	.676	161	627	138	33	12	1,197	281	439	15	303	28	34		5,720	25	3.80	1.84	2.07	0.09	11.0	5.3	1.01	.249	2.66	63	2.32	83	7.25	71.4
5	Al Spalding A. Spalding	1.78	539.2	65	48	12	.800	61	41	53	8	1	559	107	238	6	26		4		2,272	1	0.68	0.43	1.58	0.10	1.8	1.1	1.08		3.97	74	2.38	99	9.32	9.6
6	Emmanuel Clase E. Clase	1.88	360.0	366	21	25	.457	1	349	0	0	182	267	75	111	15	70	9	297	10	1,417	19	8.73	1.75	4.99	0.38	24.6	4.9	0.94	.259	2.78	45	2.43	58	6.68	68.8
7	Ed Reulbach E. Reulbach	1.89	1435.1	199	109	47	.699	165	635	125	29	5	1,066	301	396	10	466	72	32		5,607	23	3.98	2.92	1.36	0.06	11.3	8.3	1.07	.239	2.48	72	2.62	97	6.68	14.9
8	Jim Devlin J. Devlin	1.89	1181.0	129	65	60	.520	129	263	127	9	0	1,183	248	597	7	78		0		4,896	34	2.00	0.59	3.37	0.05	5.4	1.6	1.07		4.55	67	2.35	84	9.02	88.9
9	Will White W. White	1.92	2190.1	249	133	109	.550	248	696	242	21	0	2,165	467	1,173	23	244		1		9,233	146	2.86	1.00	2.85	0.09	7.5	2.6	1.10		4.82	80	2.49	102	8.90	-29.1
10	Old Hoss Radbourn O. Hoss Radbourn	1.96	2548.0	295	193	88	.687	277	1,228	272	26	3	2,245	554	1,075	36	352		17		10,349	144	4.34	1.24	3.49	0.13	11.9	3.4	1.02		3.80	69	2.67	90	7.93	57.8
11	Paul Skenes P. Skenes	1.96	320.2	55	21	13	.618	55	386	1	0	0	230	70	76	21	74	12	0	0	1,247	4	10.83	2.08	5.22	0.59	31.0	5.9	0.95	.277	2.13	46	2.39	58	6.46	61
12	Jack Pfiester J. Pfiester	1.98	933.1	129	64	37	.634	110	454	67	15	0	753	205	312	6	249	36	12		3,695	15	4.38	2.40	1.82	0.06	12.3	6.7	1.07	.253	3.01	77	2.26	85	7.26	40
13	Joe Wood J. Wood	2.00	1145.1	175	92	48	.657	127	856	100	24	6	903	254	415	8	334	48	39		4,520	35	6.73	2.62	2.56	0.06	18.9	7.4	1.08	.273	3.26	68	2.20	76	7.10	94.4
14	Addie Joss A. Joss	2.03	1652.0	198	117	68	.632	185	674	172	31	3	1,362	373	547	15	285	50	11		6,358	19	3.67	1.55	2.36	0.08	10.6	4.5	1.00	.253	2.98	73	2.39	88	7.42	56.9
15	John Ward J. Ward	2.07	2409.0	284	161	100	.617	257	897	240	24	3	2,252	553	1,142	24	235		29		9,889	138	3.35	0.88	3.82	0.09	9.1	2.4	1.03		4.27	81	2.39	95	8.41	12.5
16	Christy Mathewson C. Mathewson	2.08	1727.0	217	128	71	.643	197	1,085	169	28	6	1,450	399	622	22	436	42	19		6,893	75	5.65	2.27	2.49	0.11	15.7	6.3	1.09	.269	3.24	69	2.40	78	7.56	124.8
17	Jeff Pfeffer J. Pfeffer	2.11	1235.2	161	78	53	.595	136	479	108	18	8	1,045	290	394	26	313	61	24		4,979	18	3.49	2.28	1.53	0.19	9.6	6.3	1.10	.249	2.87	76	2.77	99	7.61	5.7
18	Tommy Bond T. Bond	2.13	2535.1	292	180	100	.643	286	715	270	35	0	2,598	599	1,155	24	153		9		10,331	79	2.54	0.54	4.67	0.09	6.9	1.5	1.09		4.10	87	2.34	95	9.22	34.5
19	Dutch Leonard D. Leonard	2.13	1361.1	211	90	64	.584	161	771	96	25	11	1,134	322	425	16	412	41	40		5,375	32	5.10	2.72	1.87	0.11	14.3	7.7	1.14	.270	2.81	79	2.39	86	7.50	54.5
20	George McQuillan G. McQuillan	2.15	1019.1	163	59	51	.536	113	396	75	17	6	831	244	340	11	272	16	37		3,962	13	3.50	2.40	1.46	0.10	10.0	6.9	1.08	.251	3.00	78	2.49	91	7.34	27.8
21	Doc White D. White	2.17	1550.1	198	98	80	.551	185	761	153	24	1	1,341	374	563	19	361	64	13		6,161	38	4.42	2.10	2.11	0.11	12.4	5.9	1.10	.267	3.27	78	2.62	96	7.78	11.6
22	Aroldis Chapman A. Chapman	2.17	319.0	324	19	20	.487	0	546	0	0	146	169	77	81	17	155	16	221	1	1,272	27	15.40	4.37	3.52	0.48	42.9	12.2	1.02	.283	2.29	56	1.96	50	4.77	68.4
23	Glenn Liebhardt G. Liebhardt	2.17	612.2	90	36	35	.507	66	280	49	7	2	543	148	225	3	183	14	23		2,419	21	4.11	2.69	1.53	0.04	11.6	7.6	1.18	.278	3.31	89	2.27	98	7.98	1.6
24	Grover Alexander G. Alexander	2.18	2104.0	284	160	75	.681	233	1,203	185	53	15	1,765	509	681	42	499	48	47		8,358	18	5.15	2.13	2.41	0.18	14.4	6.0	1.08	.262	2.91	69	2.44	77	7.55	171.3
25	Jim McCormick J. McCormick	2.18	2784.2	320	160	148	.519	314	1,016	301	18	1	2,645	674	1,321	24	416		5		11,462	112	3.28	1.34	2.44	0.08	8.9	3.6	1.10		4.27	85	2.57	100	8.55	-30.7