Between the 2014 and 2017 seasons, 50 pitchers were tied for the lowest ERA by a relief pitcher, with an ERA of 0.00. The first three are José Berríos, Jen-Ho Tseng and Jack Flaherty.
| 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 |  | J. Berríos | 0.00 | 1 | 1 | 0 | 1.000 | 0 | 1 | 0 | 0 | 0 | 1.1 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 0 | 6.75 | 0.00 | 0.00 | 16.7 | 0.0 | 1.50 | .400 | 0.00 | 13.50 | |
| 2 |  | J. Tseng | 0.00 | 1 | 1 | 0 | 1.000 | 0 | 2 | 0 | 0 | 0 | 3.0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 9 | 0 | 6.00 | 3.00 | 2.00 | 0.00 | 22.2 | 11.1 | 0.33 | .000 | 0.00 | 0.00 |
| 3 |  | J. Flaherty | 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 | ||
| 4 | | C. O'Grady | 0.00 | 7 | 0 | 0 | 0 | 4 | 0 | 0 | 0 | 6.2 | 7 | 0 | 0 | 0 | 3 | 0 | 1 | 0 | 28 | 0 | 5.40 | 4.05 | 1.33 | 0.00 | 14.3 | 10.7 | 1.50 | .333 | 0.00 | 9.45 | |
| 5 |  | 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 |
| 6 | | A. Wilkerson | 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 | ||
| 7 | | D. McGuire | 0.00 | 4 | 0 | 0 | 0 | 4 | 0 | 0 | 0 | 5.2 | 2 | 0 | 0 | 0 | 0 | 1 | 2 | 0 | 20 | 0 | 6.35 | 0.00 | 0.00 | 20.0 | 0.0 | 0.35 | .133 | 0.00 | 3.18 | ||
| 8 | | J. Stephens | 0.00 | 3 | 1 | 0 | 1.000 | 0 | 3 | 0 | 0 | 0 | 6.1 | 2 | 0 | 0 | 0 | 2 | 1 | 1 | 0 | 23 | 0 | 4.26 | 2.84 | 1.50 | 0.00 | 13.0 | 8.7 | 0.63 | .118 | 0.00 | 2.84 |
| 9 | | M. Moore | 0.00 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 2.0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 7 | 0 | 4.50 | 0.00 | 0.00 | 14.3 | 0.0 | 0.50 | .167 | 0.00 | 4.50 | ||
| 10 | | J.D. Davis | 0.00 | 2 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 1.2 | 1 | 0 | 0 | 0 | 1 | 0 | 2 | 0 | 7 | 0 | 16.20 | 5.40 | 3.00 | 0.00 | 42.9 | 14.3 | 1.20 | .333 | 0.00 | 5.40 | |
| 11 | | J. Sherfy | 0.00 | 11 | 2 | 0 | 1.000 | 0 | 9 | 0 | 0 | 1 | 10.2 | 5 | 0 | 0 | 0 | 2 | 0 | 2 | 0 | 37 | 0 | 7.59 | 1.69 | 4.50 | 0.00 | 24.3 | 5.4 | 0.66 | .192 | 0.00 | 4.22 |
| 12 | | T. Vieira | 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 | ||
| 13 | | H. Perez | 0.00 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 5 | 0 | 0.00 | 9.00 | 0.00 | 0.00 | 0.0 | 20.0 | 2.00 | .250 | 0.00 | 9.00 | |
| 14 | | J. Ruiz | 0.00 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 4 | 0 | 9.00 | 9.00 | 1.00 | 0.00 | 25.0 | 25.0 | 1.00 | .000 | 0.00 | 0.00 | |
| 15 | | J. Jay | 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 | ||
| 16 | | D. Slania | 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 | ||
| 17 |  | T. Anderson | 0.00 | 2 | 1 | 0 | 1.000 | 0 | 7 | 0 | 0 | 0 | 5.0 | 2 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 18 | 2 | 12.60 | 1.80 | 7.00 | 0.00 | 38.9 | 5.6 | 0.60 | .200 | 0.00 | 3.60 |
| 18 | | R. Whalen | 0.00 | 1 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 2.0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 6 | 0 | 9.00 | 0.00 | 0.00 | 33.3 | 0.0 | 0.00 | .000 | 0.00 | 0.00 | ||
| 19 | | H. Velazquez | 0.00 | 5 | 3 | 0 | 1.000 | 0 | 8 | 0 | 0 | 0 | 10.1 | 4 | 0 | 0 | 0 | 3 | 0 | 4 | 0 | 36 | 0 | 6.97 | 2.61 | 2.67 | 0.00 | 22.2 | 8.3 | 0.68 | .160 | 0.00 | 3.48 |
| 20 | | T. Cloyd | 0.00 | 1 | 1 | 0 | 1.000 | 0 | 1 | 0 | 0 | 0 | 1.0 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 0 | 9.00 | 0.00 | 0.00 | 25.0 | 0.0 | 2.00 | .667 | 0.00 | 18.00 | |
| 21 | | H. Wood | 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 | ||
| 22 |  | H. Jin Ryu | 0.00 | 1 | 0 | 0 | 0 | 2 | 0 | 0 | 1 | 4.0 | 2 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 14 | 0 | 4.50 | 2.25 | 2.00 | 0.00 | 14.3 | 7.1 | 0.75 | .182 | 0.00 | 4.50 | |
| 23 | | P. Johnson | 0.00 | 1 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 1.0 | 2 | 0 | 2 | 0 | 1 | 0 | 0 | 0 | 7 | 0 | 18.00 | 9.00 | 2.00 | 0.00 | 28.6 | 14.3 | 3.00 | .500 | 18.00 | 18.00 | |
| 24 |  | E. Rodriguez | 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 | ||
| 25 | | E. Aybar | 0.00 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.1 | 0 | 0 | 0 | 0 | 1 | 0 | 2 | 0 | 4 | 0 | 0.00 | 6.75 | 0.00 | 0.00 | 0.0 | 25.0 | 0.75 | .000 | 0.00 | 0.00 | |
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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