best single season era + minimum 50 innings pitched

Zack Britton has the lowest ERA with 50.0+ innings pitched in a season, with an ERA of 0.54 in 2016.

Interpreted as:

best single season era by a player + minimum 50 innings pitched

	NAME	ERA	IP	SEASON	TM	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	Zack Britton Z. Britton	0.54	67.0	2016	BAL	69	2	1	.667	0	74	0	0	47	38	4	7	1	18	0	63	3	254	10	9.94	2.42	4.11	0.13	29.1	7.1	0.84	.230	0.94	13	1.93	44	5.10	17.7
2	Fernando Rodney F. Rodney	0.60	74.2	2012	TBR	76	2	2	.500	0	76	0	0	48	43	5	9	2	15	3	65	1	282	4	9.16	1.81	5.07	0.24	27.0	5.3	0.78	.220	1.08	16	2.12	52	5.18	16.2
3	Emmanuel Clase E. Clase	0.61	74.1	2024	CLE	74	4	2	.667	0	66	0	0	47	39	5	10	2	10	2	66	1	270	2	7.99	1.21	6.60	0.24	24.4	3.7	0.66	.195	1.21	15	2.22	55	4.72	15.2
4	Dennis Eckersley D. Eckersley	0.61	73.1	1990	OAK	63	4	2	.667	0	73	0	0	48	41	5	9	2	4	0	61	1	262	0	8.96	0.49	18.25	0.25	27.9	1.5	0.61	.213	1.10	17	1.33	35	5.03	20.6
5	Rob Murphy R. Murphy	0.72	50.1	1986	CIN	34	6	0	1.000	0	36	0	0	1	26	4	4	0	21	0	12	2	195	5	6.44	3.75	1.71	0.00	18.5	10.8	0.93	.188	0.72	19	2.58	67	4.65	7
6	Blake Treinen B. Treinen	0.78	80.1	2018	OAK	68	9	2	.818	0	100	0	0	38	46	7	12	2	21	1	58	3	315	6	11.20	2.35	4.76	0.22	31.7	6.7	0.83	.230	1.34	19	1.81	44	5.15	21
7	Earl Hamilton E. Hamilton	0.83	54.0	1918	PIT	6	6	0	1.000	6	20	6	1	0	47	5	7	0	13	0	0		210	1	3.33	2.17	1.54	0.00	9.5	6.2	1.11	.266	1.17	30	2.21	80	7.83	3.3
8	Nick Maddox N. Maddox	0.83	54.0	1907	PIT	6	5	1	.833	6	38	6	1	0	32	5	8	0	13	4	0		197	1	6.33	2.17	2.92	0.00	19.3	6.6	0.83	.225	1.33	34	1.72	65	5.33	5.5
9	Tim Keefe T. Keefe	0.86	105.0	1880	TRO	12	6	6	.500	12	39	12	0	0	68	10	27	0	16		0		397	1	3.34	1.37	2.44	0.00	9.8	4.0	0.80		2.31	35	2.25	91	5.83	3.6
10	Bill Henry B. Henry	0.87	52.0	1964	CIN	37	2	2	.500	0	28	0	0	6	31	5	9	2	12	3	20	4	202	1	4.85	2.08	2.33	0.35	13.9	5.9	0.83	.185	1.56	24	2.89	82	5.37	3.6
11	Dennys Reyes D. Reyes	0.89	50.2	2006	MIN	66	5	0	1.000	0	49	0	0	0	35	5	8	3	15	0	8	2	194	4	8.70	2.66	3.27	0.53	25.3	7.7	0.99	.252	1.42	20	2.86	65	6.22	8.7
12	Ferdie Schupp F. Schupp	0.90	140.1	1916	NYG	30	9	3	.750	11	86	8	4	1	79	14	22	1	37	5	17		525	2	5.52	2.37	2.32	0.06	16.4	7.0	0.83	.197	1.41	36	2.08	84	5.07	6.1
13	Jonathan Papelbon J. Papelbon	0.92	68.1	2006	BOS	59	4	2	.667	0	75	0	0	35	40	7	8	3	13	1	49	2	257	2	9.88	1.71	5.77	0.40	29.2	5.1	0.78	.224	1.05	20	2.13	48	5.27	17.7
14	Wade Davis W. Davis	0.94	67.1	2015	KCR	69	8	1	.889	0	78	0	0	17	33	7	8	3	20	0	24	1	251	1	10.43	2.67	3.90	0.40	31.1	8.0	0.79	.200	1.07	23	2.28	58	4.41	12.7
15	Chris Hammond C. Hammond	0.95	76.0	2002	ATL	63	7	2	.778	0	63	0	0	0	53	8	15	1	31	1	6	9	311	1	7.46	3.67	2.03	0.12	20.3	10.0	1.11	.242	1.78	23	2.73	65	6.28	12.3
16	Aaron Loup A. Loup	0.95	56.2	2021	NYM	65	6	0	1.000	2	57	0	0	0	37	6	9	1	16	4	6	0	218	0	9.05	2.54	3.56	0.16	26.1	7.3	0.94	.257	1.43	24	2.44	58	5.88	11.2
17	Dutch Leonard D. Leonard	0.96	224.2	1914	BSA	36	19	5	.792	25	176	17	7	3	139	24	34	3	60	8	8		842	2	7.05	2.40	2.93	0.12	20.9	7.1	0.89	.229	1.36	36	1.95	70	5.57	20.4
18	Eric O'Flaherty E. O'Flaherty	0.98	73.2	2011	ATL	78	2	4	.333	0	67	0	0	0	59	8	9	2	21	3	5	8	301	1	8.19	2.57	3.19	0.24	22.3	7.0	1.09	.274	1.10	26	2.53	67	7.21	10.3
19	Wade Davis W. Davis	1.00	72.0	2014	KCR	71	9	2	.818	0	109	0	0	3	38	8	8	0	23	3	11	0	279	1	13.63	2.88	4.74	0.00	39.1	8.2	0.85	.264	1.00	25	1.18	32	4.75	20.7
20	Craig Kimbrel C. Kimbrel	1.01	62.2	2012	ATL	63	3	1	.750	0	116	0	0	42	27	7	7	3	14	2	56	0	231	5	16.66	2.01	8.29	0.43	50.2	6.1	0.65	.250	1.01	26	0.77	20	3.88	21.6
21	Dale Murray D. Murray	1.03	69.2	1974	MON	32	1	1	.500	0	31	0	0	10	46	8	12	1	23	0	23	2	271	1	4.00	2.97	1.35	0.13	11.4	8.5	0.99	.208	1.55	27	2.86	78	5.94	6.1
22	Rollie Fingers R. Fingers	1.04	78.0	1981	MIL	47	6	3	.667	0	61	0	0	28	55	9	9	3	13	1	41	5	297	1	7.04	1.50	4.69	0.35	20.5	4.4	0.87	.237	1.04	30	2.07	58	6.35	13.4
23	Mordecai Brown M. Brown	1.04	277.1	1906	CHC	36	26	6	.813	32	144	27	9	3	198	32	56	1	61	4	4		1,044	2	4.67	1.98	2.36	0.03	13.8	5.8	0.93	.236	1.82	39	2.08	75	6.43	21.1
24	Bob Veale B. Veale	1.04	77.2	1963	PIT	34	5	2	.714	7	68	3	2	3	59	9	15	1	40	1	10	2	321	5	7.88	4.64	1.70	0.12	21.2	12.5	1.27	.275	1.74	32	2.48	77	6.84	6.6
25	Chris Martin C. Martin	1.05	51.1	2023	BOS	55	4	1	.800	0	46	0	0	3	45	6	6	2	8	0	12	3	199	1	8.06	1.40	5.75	0.35	23.1	4.0	1.03	.301	1.05	23	2.43	56	7.89	10.7