50 pitchers are tied for the best ERA by a relief pitcher in a season, with an ERA of 0.00 in 2024. The first three are Reynaldo López, Trevor McDonald and Tucker Davidson.
| 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 |  | R. López | 0.00 | 2024 |  ATL | 1 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 18.00 | 0.00 | 0.00 | 66.7 | 0.0 | 0.00 | .000 | 0.00 | 0.00 | ||
| 2 |  | T. McDonald | 0.00 | 2024 |  SFG | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 3.0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 10 | 0 | 3.00 | 3.00 | 1.00 | 0.00 | 10.0 | 10.0 | 0.33 | .000 | 0.00 | 0.00 | |
| 3 |  | T. Davidson | 0.00 | 2024 |  BAL | 1 | 1 | 0 | 1.000 | 0 | 1 | 0 | 0 | 0 | 4.2 | 4 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 19 | 0 | 1.93 | 3.86 | 0.50 | 0.00 | 5.3 | 10.5 | 1.29 | .250 | 0.00 | 7.71 |
| 4 |  | M. Church | 0.00 | 2024 |  TEX | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1.0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 0 | 9.00 | 0.00 | 0.00 | 25.0 | 0.0 | 1.00 | .333 | 0.00 | 9.00 | ||
| 5 |  | T. Heineman | 0.00 | 2024 |  TOR | 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 | ||
| 6 |  | S. Arrighetti | 0.00 | 2024 |  HOU | 1 | 0 | 0 | 0 | 4 | 0 | 0 | 0 | 2.1 | 0 | 0 | 0 | 0 | 3 | 1 | 0 | 0 | 11 | 0 | 15.43 | 11.57 | 1.33 | 0.00 | 36.4 | 27.3 | 1.29 | .000 | 0.00 | 0.00 | |
| 7 |  | J. Topa | 0.00 | 2024 |  MIN | 3 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 2.1 | 1 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 8 | 0 | 7.71 | 0.00 | 0.00 | 25.0 | 0.0 | 0.43 | .167 | 0.00 | 3.86 | ||
| 8 |  | J. Jobe | 0.00 | 2024 |  DET | 2 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 4.0 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 16 | 0 | 4.50 | 2.25 | 2.00 | 0.00 | 12.5 | 6.3 | 0.50 | .077 | 0.00 | 2.25 | |
| 9 |  | G. Hollowell | 0.00 | 2024 |  CHC | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1.1 | 2 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 6 | 0 | 6.75 | 0.00 | 0.00 | 16.7 | 0.0 | 1.50 | .400 | 0.00 | 13.50 | ||
| 10 |  | M. Stefanic | 0.00 | 2024 |  LAA | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 5 | 0 | 0.00 | 0.00 | 0.00 | 0.0 | 0.0 | 1.00 | .250 | 0.00 | 9.00 | ||
| 11 |  | E. Alvarez | 0.00 | 2024 |  NYM | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1.0 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 5 | 0 | 9.00 | 0.00 | 0.00 | 20.0 | 0.0 | 1.00 | .333 | 0.00 | 9.00 | ||
| 12 |  | J. Pereda | 0.00 | 2024 |  MIA | 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 | ||
| 13 |  | M. McGreevy | 0.00 | 2024 |  STL | 1 | 1 | 0 | 1.000 | 0 | 4 | 0 | 0 | 0 | 3.0 | 2 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 10 | 0 | 12.00 | 0.00 | 0.00 | 40.0 | 0.0 | 0.67 | .333 | 0.00 | 6.00 | |
| 14 |  | M. Rojas | 0.00 | 2024 |  LAD | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 0 | 0.00 | 0.00 | 0.00 | 0.0 | 0.0 | 1.00 | .250 | 0.00 | 9.00 | ||
| 15 | | D. Walton | 0.00 | 2024 | SFG | 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 |  | A. Walters | 0.00 | 2024 |  CLE | 8 | 1 | 0 | 1.000 | 0 | 6 | 0 | 0 | 0 | 7.0 | 1 | 0 | 1 | 0 | 5 | 0 | 3 | 0 | 27 | 1 | 7.71 | 6.43 | 1.20 | 0.00 | 22.2 | 18.5 | 0.86 | .063 | 1.29 | 1.29 |
| 17 |  | S. Burke | 0.00 | 2024 |  CWS | 1 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 3.0 | 3 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 14 | 1 | 9.00 | 3.00 | 3.00 | 0.00 | 21.4 | 7.1 | 1.33 | .300 | 3.00 | 9.00 | |
| 18 | | N. Nastrini | 0.00 | 2024 | CWS | 1 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 3.1 | 1 | 0 | 0 | 0 | 4 | 0 | 0 | 0 | 14 | 0 | 5.40 | 10.80 | 0.50 | 0.00 | 14.3 | 28.6 | 1.50 | .125 | 0.00 | 2.70 | |
| 19 |  | L. Guerrero | 0.00 | 2024 |  BOS | 9 | 0 | 0 | 0 | 9 | 0 | 0 | 0 | 10.0 | 6 | 0 | 1 | 0 | 2 | 0 | 2 | 0 | 36 | 0 | 8.10 | 1.80 | 4.50 | 0.00 | 25.0 | 5.6 | 0.80 | .240 | 0.90 | 5.40 | |
| 20 |  | N. Cortes | 0.00 | 2024 |  NYY | 1 | 1 | 0 | 1.000 | 0 | 3 | 0 | 0 | 0 | 4.1 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 14 | 0 | 6.23 | 2.08 | 3.00 | 0.00 | 21.4 | 7.1 | 0.23 | .000 | 0.00 | 0.00 |
| 21 | | J. Wrobleski | 0.00 | 2024 | LAD | 2 | 0 | 0 | 0 | 6 | 0 | 0 | 1 | 6.0 | 3 | 0 | 0 | 0 | 5 | 1 | 1 | 0 | 25 | 0 | 9.00 | 7.50 | 1.20 | 0.00 | 24.0 | 20.0 | 1.33 | .231 | 0.00 | 4.50 | |
| 22 | | R. Blanco | 0.00 | 2024 | HOU | 1 | 0 | 0 | 0 | 5 | 0 | 0 | 0 | 2.0 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 8 | 0 | 22.50 | 4.50 | 5.00 | 0.00 | 62.5 | 12.5 | 1.00 | .500 | 0.00 | 4.50 | |
| 23 | | E. Sabrowski | 0.00 | 2024 | CLE | 8 | 0 | 0 | 0 | 19 | 0 | 0 | 1 | 12.2 | 6 | 0 | 0 | 0 | 4 | 0 | 4 | 0 | 47 | 1 | 13.50 | 2.84 | 4.75 | 0.00 | 40.4 | 8.5 | 0.79 | .250 | 0.00 | 4.26 | |
| 24 |  | E. Justice | 0.00 | 2024 |  COL | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 2 | 0 | 27.00 | 27.00 | 1.00 | 0.00 | 50.0 | 50.0 | 3.00 | 0.00 | 0.00 | ||
| 25 |  | S. Cruz | 0.00 | 2024 |  KCR | 5 | 0 | 0 | 0 | 4 | 0 | 0 | 0 | 5.2 | 1 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 18 | 1 | 6.35 | 0.00 | 0.00 | 22.2 | 0.0 | 0.18 | .071 | 0.00 | 1.59 | ||
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.
Phillies 
Nationals 
AZ 
Brewers 
Padres 
Mariners 
TBR 
