Since 2000, 29 pitchers are tied for the best ERA by a Red Sox relief pitcher, with an ERA of 0.00. The first three are Kyle Harrison, Nate Eaton and Nick Burdi.

	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	Kyle Harrison K. Harrison	0.00	1	0	0		0	2	0	0	0	3.0	3	0	0	0	0	1	0	0	13	0	6.00	0.00		0.00	15.4	0.0	1.00	.300	0.00	9.00
2	Nate Eaton N. Eaton	0.00	1	0	0		0	0	0	0	0	1.0	2	0	0	0	0	0	1	0	4	0	0.00	0.00		0.00	0.0	0.0	2.00	.500	0.00	18.00
3	Nick Burdi N. Burdi	0.00	4	0	0		0	5	0	0	0	5.1	5	0	0	0	2	0	2	0	21	1	8.44	3.38	2.50	0.00	23.8	9.5	1.31	.357	0.00	8.44
4	Dominic Smith D. Smith	0.00	3	0	0		0	0	0	0	0	3.0	2	0	0	0	1	0	3	0	11	0	0.00	3.00	0.00	0.00	0.0	9.1	1.00	.200	0.00	6.00
5	Reese McGuire R. McGuire	0.00	1	0	0		0	0	0	0	0	1.0	0	0	0	0	0	0	1	0	3	0	0.00	0.00		0.00	0.0	0.0	0.00	.000	0.00	0.00
6	Christian Arroyo C. Arroyo	0.00	1	0	0		0	0	0	0	0	1.0	1	0	2	1	1	0	1	0	5	0	0.00	9.00	0.00	9.00	0.0	20.0	2.00	.000	18.00	9.00
7	Marwin Gonzalez M. Gonzalez	0.00	1	0	0		0	0	0	0	0	1.0	0	0	0	0	0	0	0	0	3	0	0.00	0.00		0.00	0.0	0.0	0.00	.000	0.00	0.00
8	Brandon Brennan B. Brennan	0.00	1	0	0		0	1	0	0	0	3.0	3	0	0	0	2	0	0	0	11	0	3.00	6.00	0.50	0.00	9.1	18.2	1.67	.375	0.00	9.00
9	Kevin Plawecki K. Plawecki	0.00	3	0	0		0	0	0	0	0	2.2	1	0	0	0	1	0	3	0	10	0	0.00	3.38	0.00	0.00	0.0	10.0	0.75	.111	0.00	3.38
10	Zack Godley Z. Godley	0.00	1	0	0		0	7	0	0	0	4.0	4	0	0	0	0	0	0	0	16	0	15.75	0.00		0.00	43.8	0.0	1.00	.444	0.00	9.00
11	Jhoulys Chacin J. Chacin	0.00	1	0	0		0	0	0	0	0	1.0	0	0	0	0	1	0	0	0	4	0	0.00	9.00	0.00	0.00	0.0	25.0	1.00	.000	0.00	0.00
12	David Price D. Price	0.00	5	1	0	1.000	0	13	0	0	0	8.2	3	0	0	0	2	0	1	0	32	0	13.50	2.08	6.50	0.00	40.6	6.3	0.58	.176	0.00	3.12
13	Mitch Moreland M. Moreland	0.00	1	0	0		0	1	0	0	0	1.0	2	0	0	0	0	0	1	0	5	0	9.00	0.00		0.00	20.0	0.0	2.00	.500	0.00	18.00
14	Ryan LaMarre R. LaMarre	0.00	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
15	Dalier Hinojosa D. Hinojosa	0.00	1	0	0		0	2	0	0	0	1.2	0	0	0	0	3	1	1	0	9	0	10.80	16.20	0.67	0.00	22.2	33.3	1.80	.000	0.00	0.00
16	Ryan Dempster R. Dempster	0.00	3	0	0		0	1	0	0	0	2.2	3	0	0	0	1	0	1	0	11	0	3.38	3.38	1.00	0.00	9.1	9.1	1.50	.333	0.00	10.13
17	Justin Germano J. Germano	0.00	1	0	0		0	7	0	0	0	5.2	5	0	0	0	2	0	1	0	24	1	11.12	3.18	3.50	0.00	29.2	8.3	1.24	.333	0.00	7.94
18	Trever Miller T. Miller	0.00	3	0	0		0	1	0	0	0	2.0	0	0	0	0	0	0	1	0	6	0	4.50	0.00		0.00	16.7	0.0	0.00	.000	0.00	0.00
19	Kyle Weiland K. Weiland	0.00	2	0	0		0	2	0	0	0	3.0	1	0	0	0	0	0	2	0	10	0	6.00	0.00		0.00	20.0	0.0	0.33	.125	0.00	3.00
20	Bill Hall B. Hall	0.00	1	0	0		0	0	0	0	0	1.0	0	0	0	0	0	0	1	0	3	0	0.00	0.00		0.00	0.0	0.0	0.00	.000	0.00	0.00
21	Nick Green N. Green	0.00	1	0	0		0	0	0	0	0	2.0	0	0	0	0	3	0	1	0	9	0	0.00	13.50	0.00	0.00	0.0	33.3	1.50	.000	0.00	0.00
22	Jon Lester J. Lester	0.00	1	0	0		0	2	0	0	0	2.0	0	0	0	0	0	0	0	0	6	0	9.00	0.00		0.00	33.3	0.0	0.00	.000	0.00	0.00
23	Kevin Jarvis K. Jarvis	0.00	1	0	0		0	0	0	0	0	1.0	1	0	0	0	0	0	1	0	3	0	0.00	0.00		0.00	0.0	0.0	1.00	.333	0.00	9.00
24	Mike Stanton M. Stanton	0.00	1	0	0		0	1	0	0	0	1.0	1	0	0	0	0	0	0	0	3	0	9.00	0.00		0.00	33.3	0.0	1.00	.500	0.00	9.00
25	Phil Seibel P. Seibel	0.00	2	0	0		0	1	0	0	0	3.2	0	0	0	0	5	1	0	0	18	0	2.45	12.27	0.20	0.00	5.6	27.8	1.36	.000	0.00	0.00

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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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Sat 4/4	SDP	@	BOS	4:10 PM
Sun 4/5	SDP	@	BOS	1:35 PM
Mon 4/6	MIL	@	BOS	6:45 PM
Tue 4/7	MIL	@	BOS	6:45 PM
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Red Sox	2	5	.286	4.0
Rays	2	5	.286	4.0
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Twins	3	4	.429	1.5
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