lowest era in a season by a relief pitcher with at least 30 ip

27 pitchers are tied for the best ERA by a relief pitcher with 30.0+ innings pitched in a season, with an ERA of 0.00. The first three are Walter Johnson, Byron Houck and Jim Baskette in 1912.

	NAME	ERA	IP	SEASON	TM	G	W	L	W%	GS	SO	CG	SHO	SV	H	R	HR	BB	HBP	GF	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Walter Johnson W. Johnson	0.00	51.1	1912	WSH	13	6	2	.750	0	34	0	0	2	32	9	0	11	2	13	189	2	5.96	1.93	3.09	0.00	18.0	5.8	0.84	.225	1.58	5.61
2	Byron Houck B. Houck	0.00	48.2	1912	PHA	13	0	2	.000	0	14	0	0	1	40	21	1	16	2	10	197	2	2.59	2.96	0.88	0.18	7.1	8.1	1.15	.238	3.88	7.40
3	Jim Baskette J. Baskette	0.00	52.1	1912	CLE	18	2	1	.667	0	23	0	0	1	44	17	1	18	1	18	214	2	3.96	3.10	1.28	0.17	10.7	8.4	1.18	.251	2.92	7.57
4	Hugh Bedient H. Bedient	0.00	41.0	1912	BSA	13	6	0	1.000	0	29	0	0	2	22	8	0	9	1	11	153	0	6.37	1.98	3.22	0.00	19.0	5.9	0.76	.193	1.76	4.83
5	Carl Cashion C. Cashion	0.00	37.0	1912	WSH	9	1	0	1.000	0	17	0	0	1	38	29	1	30	0	4	171	4	4.14	7.30	0.57	0.24	9.9	17.5	1.84	.301	7.05	9.24
6	Bill Steen B. Steen	0.00	33.2	1912	CLE	10	1	2	.333	0	14	0	0	0	37	21	0	11	1	4	137	2	3.74	2.94	1.27	0.00	10.2	8.0	1.43	.333	5.61	9.89
7	Earl Hamilton E. Hamilton	0.00	46.1	1912	SLA	15	1	1	.500	0	29	0	0	2	50	38	0	20	1	10	199	0	5.63	3.88	1.45	0.00	14.6	10.1	1.51	.336	7.38	9.71
8	Elmer Brown E. Brown	0.00	46.1	1912	SLA	10	1	2	.333	0	20	0	0	0	37	17	1	13	3	8	187	2	3.88	2.53	1.54	0.19	10.7	7.0	1.08	.240	3.30	7.19
9	Joe Lake J. Lake	0.00	64.2	1912	TOT	17	5	4	.556	0	28	0	0	1	75	50	1	14	1	15	278	1	3.90	1.95	2.00	0.14	10.1	5.0	1.38	.316	6.96	10.44
10	Willie Mitchell W. Mitchell	0.00	46.0	1912	CLE	14	1	0	1.000	0	30	0	0	1	28	15	0	16	3	9	178	6	5.87	3.13	1.88	0.00	16.9	9.0	0.96	.217	2.93	5.48
11	Charley Hall C. Hall	0.00	76.0	1912	BSA	14	6	0	1.000	0	36	0	0	2	55	23	1	21	1	12	293	0	4.26	2.49	1.71	0.12	12.3	7.2	1.00	.231	2.72	6.51
12	Joe Hovlik J. Hovlik	0.00	33.2	1911	CWS	9	1	0	1.000	0	16	0	0	0	35	19	1	14	0	3	142	0	4.28	3.74	1.14	0.27	11.3	9.9	1.46	.306	5.08	9.36
13	Claude Hendrix C. Hendrix	0.00	40.1	1911	PIT	10	0	1	.000	0	23	0	0	1	25	19	1	15	0	7	162	3	5.13	3.35	1.53	0.22	14.2	9.3	0.99	.195	4.24	5.58
14	Larry Pape L. Pape	0.00	37.0	1911	BSA	8	1	0	1.000	0	10	0	0	0	32	13	0	13	1	4	138	2	2.43	3.16	0.77	0.00	7.2	9.4	1.22	.281	3.16	7.78
15	Fred Olmstead F. Olmstead	0.00	38.2	1911	CWS	14	3	0	1.000	0	14	0	0	2	47	25	1	11	3	7	166	1	3.26	2.56	1.27	0.23	8.4	6.6	1.50	.336	5.82	10.94
16	Jack Killilay J. Killilay	0.00	30.0	1911	BSA	7	2	0	1.000	0	12	0	0	0	24	9	0	16	4	5	118	1	3.60	4.80	0.75	0.00	10.2	13.6	1.33	.279	2.70	7.20
17	George Kahler G. Kahler	0.00	34.1	1911	CLE	13	1	0	1.000	0	19	0	0	1	39	17	0	13	5	10	146	1	4.98	3.41	1.46	0.00	13.0	8.9	1.51	.358	4.46	10.22
18	Charley Hall C. Hall	0.00	68.1	1911	BSA	22	4	3	.571	0	37	0	0	4	61	43	1	30	4	19	281	0	4.87	3.95	1.23	0.13	13.2	10.7	1.33	.287	5.66	8.03
19	Judge Nagle J. Nagle	0.00	32.0	1911	TOT	9	4	0	1.000	0	17	0	0	1	31	12	2	7	0	7	126	1	4.78	1.97	2.43	0.56	13.5	5.6	1.19	.290	3.38	8.72
20	Ralph Works R. Works	0.00	52.2	1911	DET	15	4	0	1.000	0	32	0	0	0	57	39	1	24	1	10	236	2	5.47	4.10	1.33	0.17	13.6	10.2	1.54	.315	6.66	9.74
21	Tex Covington T. Covington	0.00	35.2	1911	DET	11	2	0	1.000	0	16	0	0	0	43	20	1	17	5	4	154	2	4.04	4.29	0.94	0.25	10.4	11.0	1.68	.365	5.05	10.85
22	Fred Sherry F. Sherry	0.00	35.1	1911	WSH	7	0	1	.000	0	16	0	0	0	36	21	1	9	0	6	144	0	4.08	2.29	1.78	0.25	11.1	6.3	1.27	.297	5.35	9.17
23	Ed Willett E. Willett	0.00	36.0	1911	DET	11	2	3	.400	0	17	0	0	1	37	28	1	16	3	7	145	0	4.25	4.00	1.06	0.25	11.7	11.0	1.47	.333	7.00	9.25
24	Lou Lowdermilk L. Lowdermilk	0.00	39.1	1911	SLN	13	2	2	.500	0	15	0	0	0	44	29	0	17	3	11	167	4	3.43	3.89	0.88	0.00	9.0	10.2	1.55	.333	6.64	10.07
25	Lefty George L. George	0.00	38.1	1911	SLA	14	2	1	.667	0	8	0	0	0	36	24	0	16	6	10	154	0	1.88	3.76	0.50	0.00	5.2	10.4	1.36	.290	5.63	8.45

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StatMuse has game-level data for ERA and innings pitched going back to the 1901 season.

Some of the information used here was obtained free of charge from Retrosheet.

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27 pitchers are tied for the best ERA by a relief pitcher with 30.0+ innings pitched in a season, with an ERA of 0.00. The first three are Walter Johnson, Byron Houck and Jim Baskette in 1912.

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