what is the lowest era by a relief pitcher all-time

50 pitchers are tied for the best career ERA by a relief pitcher, with an ERA of 0.00. The first three are Alek Manoah, Alec Gamboa and William Kempner.

	NAME	ERA	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	Alek Manoah A. Manoah	0.00	1	0	0		0	1	0	0	0	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
2	Alec Gamboa A. Gamboa	0.00	1	0	0		0	2	0	0	0	1.0	0	0	0	0	0	0	1	0	3	0	18.00	0.00		0.00	66.7	0.0	0.00	.000	0.00	0.00
3	William Kempner W. Kempner	0.00	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
4	Nick Davila N. Davila	0.00	2	0	0		0	1	0	0	0	2.0	2	0	0	0	1	0	1	0	8	0	4.50	4.50	1.00	0.00	12.5	12.5	1.50	.333	0.00	9.00
5	Eduardo Rivera E. Rivera	0.00	1	0	0		0	3	0	0	0	3.1	1	0	0	0	0	0	1	0	10	0	8.10	0.00		0.00	30.0	0.0	0.30	.143	0.00	2.70
6	Kendry Rojas K. Rojas	0.00	1	0	0		0	0	0	0	0	2.0	2	0	0	0	3	0	0	0	8	0	0.00	13.50	0.00	0.00	0.0	37.5	2.50	.400	0.00	9.00
7	Andrew Alvarez A. Alvarez	0.00	1	1	0	1.000	0	5	0	0	0	4.1	4	0	0	0	0	0	1	0	16	0	10.38	0.00		0.00	31.3	0.0	0.92	.364	0.00	8.31
8	Mason Barnett M. Barnett	0.00	1	0	0		0	1	0	0	0	2.0	1	0	0	0	2	0	0	0	9	0	4.50	9.00	0.50	0.00	11.1	22.2	1.50	.167	0.00	4.50
9	Gavin Collyer G. Collyer	0.00	11	1	0	1.000	0	8	0	0	0	9.2	4	0	0	0	4	3	5	0	38	0	7.45	3.72	2.00	0.00	21.1	10.5	0.83	.174	0.00	3.72
10	P.J. Higgins	0.00	1	0	0		0	1	0	0	0	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
11	Duncan Davitt D. Davitt	0.00	1	0	0		0	0	0	0	0	1.0	0	0	0	0	1	0	1	0	3	0	0.00	9.00	0.00	0.00	0.0	33.3	1.00	.000	0.00	0.00
12	Tyler Tolbert T. Tolbert	0.00	1	0	0		0	0	0	0	0	0.2	1	0	0	0	0	0	1	0	2	0	0.00	0.00		0.00	0.0	0.0	1.50	.500	0.00	13.50
13	Tyler Samaniego T. Samaniego	0.00	11	0	0		0	11	0	0	0	13.2	8	0	0	0	6	1	4	0	54	0	7.24	3.95	1.83	0.00	20.4	11.1	1.02	.222	0.00	5.27
14	Walbert Ureña W. Ureña	0.00	2	0	1	.000	0	2	0	0	0	1.2	5	0	6	0	3	0	0	1	15	1	10.80	16.20	0.67	0.00	13.3	20.0	4.80	.500	32.40	27.00
15	Austin Pope A. Pope	0.00	1	0	0		0	1	0	0	0	2.0	2	0	0	0	1	0	0	0	9	0	4.50	4.50	1.00	0.00	11.1	11.1	1.50	.286	0.00	9.00
16	Roki Sasaki R. Sasaki	0.00	2	0	0		0	4	0	0	0	2.0	1	0	0	0	0	0	0	0	7	0	18.00	0.00		0.00	57.1	0.0	0.50	.333	0.00	4.50
17	Dom Hamel D. Hamel	0.00	1	0	0		0	0	0	0	0	1.0	3	0	0	0	0	1	0	0	6	0	0.00	0.00		0.00	0.0	0.0	3.00	.600	0.00	27.00
18	Logan Davidson L. Davidson	0.00	1	0	0		0	1	0	0	0	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
19	Ryan Fitzgerald R. Fitzgerald	0.00	2	0	0		0	0	0	0	0	2.0	2	0	0	0	0	0	2	0	8	0	0.00	0.00		0.00	0.0	0.0	1.00	.250	0.00	9.00
20	Niko Kavadas N. Kavadas	0.00	1	0	0		0	1	0	0	0	1.2	3	0	0	0	1	0	1	0	9	0	5.40	5.40	1.00	0.00	11.1	11.1	2.40	.429	0.00	16.20
21	Anthony Seigler A. Seigler	0.00	1	0	0		0	0	0	0	0	1.0	1	0	0	0	0	0	1	0	4	0	0.00	0.00		0.00	0.0	0.0	1.00	.250	0.00	9.00
22	Jared Triolo J. Triolo	0.00	1	0	0		0	0	0	0	0	1.0	3	0	2	1	1	0	1	0	8	0	0.00	9.00	0.00	9.00	0.0	12.5	4.00	.333	18.00	27.00
23	Luis Vázquez L. Vázquez	0.00	4	0	0		0	0	0	0	0	4.1	3	0	0	0	1	0	4	0	14	0	0.00	2.08	0.00	0.00	0.0	7.1	0.92	.231	0.00	6.23
24	Chase Petty C. Petty	0.00	1	0	1	.000	0	0	0	0	0	0.2	1	0	1	0	0	1	1	0	4	0	0.00	0.00		0.00	0.0	0.0	1.50	.333	13.50	13.50
25	Jared Young J. Young	0.00	1	0	0		0	0	0	0	0	0.1	1	0	0	0	1	0	1	0	3	0	0.00	27.00	0.00	0.00	0.0	33.3	6.00	.500	0.00	27.00

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

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

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DATE	MATCHUP			TIME (ET)
Sun 5/10	LAA	@	TOR	1:37 PM
Mon 5/11	LAA	@	CLE	6:10 PM
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AL West	W	L	PCT	GB
Athletics	21	18	.538
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Sat 4/25	SEA	@	STL	11-9
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Sun 5/10	WSH	@	MIA	12:15 PM
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50 pitchers are tied for the best career ERA by a relief pitcher, with an ERA of 0.00. The first three are Alek Manoah, Alec Gamboa and William Kempner.

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