Since 2010, Joe Musgrove has the lowest ERA by a relief pitcher when pitching at least 40 innings, with an ERA of 1.05.

mlb best era + since 2010 among relievers with at least 40 ip

NAME	ERA	IP	G	W	L	W%	GS	CG	GF	SHO	SV	H	TBF	R	ER	HR	BB	IBB	HBP	SO	WP	WHIP	K/9	H/9	BB/9	K/BB
Joe Musgrove	1.05	42.2	26	3	0	1.000	0	0	7	0	2	23	157	5	5	2	6	1	3	43	2	0.68	9.07	4.85	1.27	7.17
Billy Wagner	1.43	69.1	71	7	2	.778	0	0	64	0	37	38	268	14	11	5	22	3	3	104	2	0.87	13.50	4.93	2.86	4.73
Adrian Houser	1.71	63.1	33	5	0	1.000	0	0	18	0	0	47	254	14	12	4	27	1	1	53	1	1.17	7.53	6.68	3.84	1.96
Félix Bautista	1.85	126.2	121	12	6	.667	0	0	76	0	48	68	490	32	26	11	49	1	3	198	9	0.92	14.07	4.83	3.48	4.04
Bowden Francis	1.87	43.1	24	3	0	1.000	0	0	12	0	1	29	166	9	9	5	11	0	1	41	1	0.92	8.52	6.02	2.28	3.73
Emmanuel Clase	1.89	257.2	264	14	21	.400	0	0	206	0	122	193	1,012	84	54	11	47	7	3	258	15	0.93	9.01	6.74	1.64	5.49
Devin Williams	1.89	214.0	219	26	10	.722	0	0	78	0	54	119	864	60	45	14	101	2	9	337	12	1.03	14.17	5.00	4.25	3.34
Cal Quantrill	1.91	61.1	38	4	1	.800	0	0	4	0	1	52	257	16	13	5	22	1	6	53	1	1.21	7.78	7.63	3.23	2.41
Mariano Rivera	1.95	193.2	198	11	8	.579	0	0	178	0	126	150	751	45	42	11	30	10	8	167	1	0.93	7.76	6.97	1.39	5.57
Brandon Morrow	1.96	96.1	105	7	1	.875	0	0	44	0	24	81	385	22	21	4	22	2	2	93	3	1.07	8.69	7.57	2.06	4.23
Zack Britton	2.03	391.0	396	17	9	.654	0	0	250	0	154	276	1,551	102	88	17	153	6	8	367	36	1.10	8.45	6.35	3.52	2.40
Jhoan Duran	2.04	137.0	123	5	10	.333	0	0	63	0	38	98	545	40	31	12	42	8	9	181	14	1.02	11.89	6.44	2.76	4.31
Julio Urías	2.15	67.0	36	4	2	.667	0	0	11	0	4	48	273	20	16	5	25	1	3	67	2	1.09	9.00	6.45	3.36	2.68
Tejay Antone	2.16	58.1	40	2	1	.667	0	0	7	0	3	28	225	15	14	4	25	0	4	75	2	0.91	11.57	4.32	3.86	3.00
Carson Smith	2.21	102.0	108	4	6	.400	0	0	31	0	14	74	415	27	25	4	34	4	7	129	6	1.06	11.38	6.53	3.00	3.79
Elmer Dessens	2.30	47.0	53	4	2	.667	0	0	6	0	0	41	194	14	12	4	16	6	3	16	0	1.21	3.06	7.85	3.06	1.00
Mike Adams	2.32	236.1	256	17	13	.567	0	0	24	0	3	187	959	67	61	17	73	6	4	236	3	1.10	8.99	7.12	2.78	3.23
Aaron Sanchez	2.35	80.1	61	4	4	.500	0	0	13	0	3	49	307	23	21	4	23	1	3	59	3	0.90	6.61	5.49	2.58	2.57
Jesse Crain	2.39	218.0	227	13	10	.565	0	0	38	0	2	163	892	67	58	17	92	11	3	238	7	1.17	9.83	6.73	3.80	2.59
Scott Elbert	2.41	71.0	98	2	2	.500	0	0	23	0	2	59	296	19	19	4	31	5	2	65	5	1.27	8.24	7.48	3.93	2.10
Drew Pomeranz	2.42	160.0	149	7	6	.538	0	0	30	0	9	113	640	50	43	13	61	3	4	199	2	1.09	11.19	6.36	3.43	3.26
Craig Kimbrel	2.43	773.2	799	53	43	.552	0	0	623	0	425	453	3,094	232	209	68	317	10	37	1,217	67	1.00	14.16	5.27	3.69	3.84
Koji Uehara	2.43	414.0	424	20	22	.476	0	0	207	0	95	279	1,583	120	112	53	66	8	4	524	9	0.83	11.39	6.07	1.43	7.94
Tyler Holton	2.46	113.1	82	6	2	.750	0	0	13	0	1	77	436	32	31	13	22	1	5	96	5	0.87	7.62	6.11	1.75	4.36
Jimmy Nelson	2.47	43.2	39	1	3	.250	0	0	8	0	0	29	178	14	12	2	20	0	5	59	5	1.12	12.16	5.98	4.12	2.95

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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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	NL East	W	L	PCT	GB
1	Braves	104	58	.642
2	Phillies	90	72	.556	14.0
	AL East	W	L	PCT	GB
1	Orioles	101	61	.623
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