who had the lowest era in 2021 by a relief pitcher

50 pitchers were tied for the lowest ERA by a relief pitcher in 2021, with an ERA of 0.00. The first three are Joe Biagini, Seranthony Domínguez and Nick Pivetta.

	NAME	ERA	SEASON	TM	G	W	L	W%	GS	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	Joe Biagini J. Biagini	0.00	2021	CHC	1	1	0	1.000	0	2	0	0	0	3.0	2	0	0	0	1	1	1	0	13	0	6.00	3.00	2.00	0.00	15.4	7.7	1.00	.222	0.00	6.00
2	Seranthony Domínguez S. Domínguez	0.00	2021	PHI	1	0	0		0	1	0	0	0	1.0	0	0	0	0	0	0	0	0	3	0	9.00	0.00		0.00	33.3	0.0	0.00	.000	0.00	0.00
3	Nick Pivetta N. Pivetta	0.00	2021	BOS	1	0	0		0	1	0	0	1	1.0	0	0	0	0	0	0	1	0	3	0	9.00	0.00		0.00	33.3	0.0	0.00	.000	0.00	0.00
4	Eduardo Rodriguez E. Rodriguez	0.00	2021	BOS	1	1	0	1.000	0	1	0	0	0	1.0	0	0	0	0	0	0	0	0	3	0	9.00	0.00		0.00	33.3	0.0	0.00	.000	0.00	0.00
5	Andrés Muñoz A. Muñoz	0.00	2021	SEA	1	0	0		0	1	0	0	0	0.2	0	0	0	0	2	0	0	0	4	0	13.50	27.00	0.50	0.00	25.0	50.0	3.00	.000	0.00	0.00
6	Kyle Dohy K. Dohy	0.00	2021	PHI	1	0	0		0	1	0	0	0	1.0	1	0	0	0	1	0	1	0	5	0	9.00	9.00	1.00	0.00	20.0	20.0	2.00	.333	0.00	9.00
7	Jack Flaherty J. Flaherty	0.00	2021	STL	2	0	0		0	3	0	0	0	2.0	1	0	0	0	1	0	0	0	8	0	13.50	4.50	3.00	0.00	37.5	12.5	1.00	.250	0.00	4.50
8	Sergio Alcantara S. Alcantara	0.00	2021	CHC	1	0	0		0	0	0	0	0	0.1	0	0	0	0	0	0	1	0	1	0	0.00	0.00		0.00	0.0	0.0	0.00	.000	0.00	0.00
9	AJ Ramos	0.00	2021	LAA	4	0	0		0	3	0	0	0	4.2	0	0	0	0	2	0	3	0	16	0	5.79	3.86	1.50	0.00	18.8	12.5	0.43	.000	0.00	0.00
10	Logan Allen L. Allen	0.00	2021	CLE	3	1	0	1.000	0	7	0	0	0	6.0	7	0	0	0	1	1	1	0	25	0	10.50	1.50	7.00	0.00	28.0	4.0	1.33	.438	0.00	10.50
11	Luis Severino L. Severino	0.00	2021	NYY	4	1	0	1.000	0	8	0	0	0	6.0	2	0	0	0	1	1	1	0	22	0	12.00	1.50	8.00	0.00	36.4	4.5	0.50	.167	0.00	3.00
12	Romy González R. González	0.00	2021	CWS	1	0	0		0	1	0	0	0	0.1	0	0	0	0	0	0	1	0	1	0	27.00	0.00		0.00	100.0	0.0	0.00		0.00	0.00
13	Kaleb Ort K. Ort	0.00	2021	BOS	1	0	0		0	0	0	0	0	0.1	1	0	0	0	1	0	0	0	3	0	0.00	27.00	0.00	0.00	0.0	33.3	6.00	.500	0.00	27.00
14	Kervin Castro K. Castro	0.00	2021	SFG	10	1	1	.500	0	13	0	0	0	13.1	13	0	1	0	4	0	4	1	56	0	8.78	2.70	3.25	0.00	23.2	7.1	1.27	.333	0.68	8.78
15	Michael Pineda M. Pineda	0.00	2021	MIN	1	1	0	1.000	0	3	0	0	0	3.0	2	0	0	0	1	0	0	0	12	0	9.00	3.00	3.00	0.00	25.0	8.3	1.00	.250	0.00	6.00
16	Bryan Baker B. Baker	0.00	2021	TOR	1	0	0		0	1	0	0	0	1.0	1	0	0	0	0	0	0	0	4	2	9.00	0.00		0.00	25.0	0.0	1.00	.333	0.00	9.00
17	Andrew Vasquez A. Vasquez	0.00	2021	LAD	2	0	0		0	3	0	0	0	1.2	1	0	1	0	0	0	1	0	6	0	16.20	0.00		0.00	50.0	0.0	0.60	.333	5.40	5.40
18	Austin Slater A. Slater	0.00	2021	SFG	1	0	0		0	0	0	0	0	0.1	0	0	0	0	1	0	1	0	2	0	0.00	27.00	0.00	0.00	0.0	50.0	3.00	.000	0.00	0.00
19	Touki Toussaint T. Toussaint	0.00	2021	ATL	1	0	0		0	0	0	0	0	1.0	0	0	0	0	1	0	1	0	4	0	0.00	9.00	0.00	0.00	0.0	25.0	1.00	.000	0.00	0.00
20	Justin Turner J. Turner	0.00	2021	LAD	1	0	0		0	0	0	0	0	1.0	2	0	0	0	0	0	1	0	5	0	0.00	0.00		0.00	0.0	0.0	2.00	.400	0.00	18.00
21	Chris Ellis C. Ellis	0.00	2021	TBR	1	1	0	1.000	0	7	0	0	0	4.0	3	0	0	0	1	0	1	0	16	1	15.75	2.25	7.00	0.00	43.8	6.3	1.00	.375	0.00	6.75
22	Mitch Moreland M. Moreland	0.00	2021	OAK	1	0	0		0	1	0	0	0	1.0	1	0	0	0	0	0	1	0	4	0	9.00	0.00		0.00	25.0	0.0	1.00	.333	0.00	9.00
23	Kevin Pillar K. Pillar	0.00	2021	NYM	1	0	0		0	0	0	0	0	0.1	0	0	0	0	0	0	1	0	1	0	0.00	0.00		0.00	0.0	0.0	0.00	.000	0.00	0.00
24	Connor Overton C. Overton	0.00	2021	TOT	6	0	0		0	6	0	0	0	8.2	4	0	0	0	2	0	2	0	30	1	6.23	2.08	3.00	0.00	20.0	6.7	0.69	.182	0.00	4.15
25	Damon Jones D. Jones	0.00	2021	PHI	1	0	0		0	0	0	0	0	0.1	1	0	0	0	2	0	0	0	4	0	0.00	54.00	0.00	0.00	0.0	50.0	9.00	.500	0.00	27.00