Between the 2020 and 2021 seasons, 50 pitchers were tied for the best ERA by a relief pitcher, with an ERA of 0.00. The first three are Seranthony Domínguez, Eduardo Rodriguez and Andrés Muñoz.
| 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 |  | S. Domínguez | 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 | ||
| 2 | | E. Rodriguez | 0.00 | 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 | |
| 3 |  | A. Muñoz | 0.00 | 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 | |
| 4 | | K. Dohy | 0.00 | 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 | |
| 5 |  | J. Flaherty | 0.00 | 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 | |
| 6 | | S. Alcántara | 0.00 | 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 | ||
| 7 |  | L. Severino | 0.00 | 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 |
| 8 | | R. Gonzalez | 0.00 | 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 | |||
| 9 | | K. Ort | 0.00 | 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 | |
| 10 | | K. Castro | 0.00 | 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 |
| 11 | | M. Pineda | 0.00 | 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 |
| 12 | | B. Baker | 0.00 | 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 | ||
| 13 | | A. Vasquez | 0.00 | 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 | ||
| 14 | | A. Slater | 0.00 | 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 | |
| 15 |  | J. Turner | 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 | ||
| 16 | | C. Ellis | 0.00 | 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 |
| 17 |  | M. Moreland | 0.00 | 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 | ||
| 18 | | K. Pillar | 0.00 | 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 | ||
| 19 | | C. Overton | 0.00 | 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 | |
| 20 | | D. Jones | 0.00 | 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 | |
| 21 | | T. Gilbert | 0.00 | 3 | 0 | 1 | .000 | 0 | 5 | 0 | 0 | 0 | 3.2 | 2 | 0 | 1 | 0 | 2 | 0 | 0 | 0 | 14 | 0 | 12.27 | 4.91 | 2.50 | 0.00 | 35.7 | 14.3 | 1.09 | .286 | 2.45 | 4.91 |
| 22 | | Y. Ramirez | 0.00 | 1 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 2.0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 6 | 0 | 9.00 | 4.50 | 2.00 | 0.00 | 33.3 | 16.7 | 0.50 | .000 | 0.00 | 0.00 | |
| 23 | | A. Bostick | 0.00 | 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 | |
| 24 |  | A. Eaton | 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 | ||
| 25 | | K. Stewart | 0.00 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1.0 | 1 | 0 | 3 | 1 | 1 | 0 | 0 | 0 | 6 | 0 | 9.00 | 9.00 | 1.00 | 9.00 | 16.7 | 16.7 | 2.00 | .000 | 27.00 | 9.00 | |
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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