Since 2015, 49 pitchers are tied for the lowest ERA by a relief pitcher with 13.00+ K/9 in a season, with an ERA of 0.00. The first three are Roki Sasaki, José Quijada and Ryan Burr in 2025.
| NAME | ERA | K/9 | SEASON | TM | G | W | L | W% | GS | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | GF | IBB | TBF | WP | BB/9 | K/BB | HR/9 | K% | BB% | WHIP | BABIP | RA | H/9 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | R. Sasaki | 0.00 | 18.00 | 2025 |  LAD | 2 | 0 | 0 | 0 | 4 | 0 | 0 | 0 | 2.0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 0 | 0.00 | 0.00 | 57.1 | 0.0 | 0.50 | .333 | 0.00 | 4.50 | ||
| 2 |  | J. Quijada | 0.00 | 20.25 | 2025 |  LAA | 2 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 1.1 | 1 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 8 | 0 | 13.50 | 1.50 | 0.00 | 37.5 | 25.0 | 2.25 | .333 | 0.00 | 6.75 | |
| 3 | | R. Burr | 0.00 | 13.50 | 2025 |  TOR | 2 | 1 | 0 | 1.000 | 0 | 3 | 0 | 0 | 0 | 2.0 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 8 | 0 | 4.50 | 3.00 | 0.00 | 37.5 | 12.5 | 1.00 | .250 | 0.00 | 4.50 |
| 4 | | D. Nikhazy | 0.00 | 18.00 | 2025 |  CLE | 1 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 3 | 0 | 0.00 | 0.00 | 66.7 | 0.0 | 0.00 | .000 | 0.00 | 0.00 | ||
| 5 | | L. Allen | 0.00 | 18.00 | 2025 | CLE | 1 | 1 | 0 | 1.000 | 0 | 2 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 0.00 | 0.00 | 66.7 | 0.0 | 0.00 | .000 | 0.00 | 0.00 | |
| 6 | | A. Ottavino | 0.00 | 16.20 | 2025 |  NYY | 3 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 1.2 | 0 | 0 | 0 | 0 | 4 | 0 | 0 | 0 | 9 | 0 | 21.60 | 0.75 | 0.00 | 33.3 | 44.4 | 2.40 | .000 | 0.00 | 0.00 | |
| 7 | | G. Holmes | 0.00 | 18.00 | 2025 |  ATL | 1 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 3 | 0 | 0.00 | 0.00 | 66.7 | 0.0 | 0.00 | .000 | 0.00 | 0.00 | ||
| 8 | | R. López | 0.00 | 18.00 | 2024 | ATL | 1 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 0.00 | 0.00 | 66.7 | 0.0 | 0.00 | .000 | 0.00 | 0.00 | ||
| 9 | | S. Arrighetti | 0.00 | 15.43 | 2024 |  HOU | 1 | 0 | 0 | 0 | 4 | 0 | 0 | 0 | 2.1 | 0 | 0 | 0 | 0 | 3 | 1 | 0 | 0 | 11 | 0 | 11.57 | 1.33 | 0.00 | 36.4 | 27.3 | 1.29 | .000 | 0.00 | 0.00 | |
| 10 | | R. Blanco | 0.00 | 22.50 | 2024 | HOU | 1 | 0 | 0 | 0 | 5 | 0 | 0 | 0 | 2.0 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 8 | 0 | 4.50 | 5.00 | 0.00 | 62.5 | 12.5 | 1.00 | .500 | 0.00 | 4.50 | |
| 11 | | E. Sabrowski | 0.00 | 13.50 | 2024 | CLE | 8 | 0 | 0 | 0 | 19 | 0 | 0 | 1 | 12.2 | 6 | 0 | 0 | 0 | 4 | 0 | 4 | 0 | 47 | 1 | 2.84 | 4.75 | 0.00 | 40.4 | 8.5 | 0.79 | .250 | 0.00 | 4.26 | |
| 12 | | E. Justice | 0.00 | 27.00 | 2024 |  COL | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 2 | 0 | 27.00 | 1.00 | 0.00 | 50.0 | 50.0 | 3.00 | 0.00 | 0.00 | ||
| 13 | | F. Whitley | 0.00 | 13.50 | 2024 | HOU | 3 | 0 | 0 | 0 | 5 | 0 | 0 | 0 | 3.1 | 5 | 0 | 2 | 0 | 3 | 1 | 2 | 0 | 20 | 0 | 8.10 | 1.67 | 0.00 | 25.0 | 15.0 | 2.40 | .455 | 5.40 | 13.50 | |
| 14 | | Y. Gómez | 0.00 | 18.00 | 2023 | NYY | 1 | 0 | 0 | 0 | 4 | 0 | 0 | 0 | 2.0 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 8 | 0 | 0.00 | 0.00 | 50.0 | 0.0 | 0.50 | .333 | 0.00 | 4.50 | ||
| 15 | | J. Espada | 0.00 | 18.00 | 2023 |  SDP | 1 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 2 | 0 | 1 | 0 | 5 | 0 | 18.00 | 1.00 | 0.00 | 40.0 | 40.0 | 2.00 | .000 | 0.00 | 0.00 | |
| 16 | | K. Hurt | 0.00 | 13.50 | 2023 | LAD | 1 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 2.0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 6 | 0 | 0.00 | 0.00 | 50.0 | 0.0 | 0.00 | .000 | 0.00 | 0.00 | ||
| 17 | | L. Little | 0.00 | 16.20 | 2023 |  CHC | 7 | 0 | 0 | 0 | 12 | 0 | 0 | 0 | 6.2 | 5 | 0 | 0 | 0 | 4 | 1 | 3 | 0 | 30 | 1 | 5.40 | 3.00 | 0.00 | 40.0 | 13.3 | 1.35 | .385 | 0.00 | 6.75 | |
| 18 | | R. Ryan | 0.00 | 18.00 | 2023 |  SEA | 1 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 4 | 0 | 9.00 | 2.00 | 0.00 | 50.0 | 25.0 | 1.00 | .000 | 0.00 | 0.00 | |
| 19 | | P. Berroa | 0.00 | 16.20 | 2023 | SEA | 2 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 1.2 | 0 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 8 | 1 | 16.20 | 1.00 | 0.00 | 37.5 | 37.5 | 1.80 | .000 | 0.00 | 0.00 | |
| 20 | | A. Jacob | 0.00 | 15.00 | 2023 | SDP | 3 | 0 | 0 | 0 | 5 | 0 | 0 | 0 | 3.0 | 0 | 0 | 0 | 0 | 1 | 0 | 2 | 0 | 10 | 0 | 3.00 | 5.00 | 0.00 | 50.0 | 10.0 | 0.33 | .000 | 0.00 | 0.00 | |
| 21 | | C. Schmidt | 0.00 | 13.50 | 2023 | NYY | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0.2 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 2 | 0 | 0.00 | 0.00 | 50.0 | 0.0 | 0.00 | .000 | 0.00 | 0.00 | ||
| 22 | | E. Rodríguez | 0.00 | 13.50 | 2023 |  TBR | 1 | 0 | 0 | 0 | 5 | 0 | 0 | 0 | 3.1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 10 | 0 | 0.00 | 0.00 | 50.0 | 0.0 | 0.00 | .000 | 0.00 | 0.00 | ||
| 23 | | C. Vallimont | 0.00 | 13.50 | 2023 |  BAL | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0.2 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 2 | 0 | 0.00 | 0.00 | 50.0 | 0.0 | 1.50 | 1.000 | 0.00 | 13.50 | ||
| 24 | | D. Hudson | 0.00 | 15.00 | 2023 | LAD | 3 | 0 | 0 | 0 | 5 | 0 | 0 | 1 | 3.0 | 2 | 0 | 0 | 0 | 3 | 0 | 1 | 0 | 14 | 0 | 9.00 | 1.67 | 0.00 | 35.7 | 21.4 | 1.67 | .333 | 0.00 | 6.00 | |
| 25 | | H. Hembree | 0.00 | 13.50 | 2023 | TBR | 1 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 1.1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 4 | 0 | 6.75 | 2.00 | 0.00 | 50.0 | 25.0 | 0.75 | .000 | 0.00 | 0.00 | |
StatMuse has game-level data for ERA and K/9 going back to the 1901 season.
Some of the information used here was obtained free of charge from Retrosheet.
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HR
244
2nd
R
825
2nd
SO
1,505
1st
ERA
3.95
17th
2025 Division Standings
| TEAM | W | L | PCT | GB |
|---|---|---|---|---|
| Dodgers | 93 | 69 | .574 | |
| Padres | 90 | 72 | .556 | 3.0 |
 Giants | 81 | 81 | .500 | 12.0 |
 Diamondbacks | 80 | 82 | .494 | 13.0 |
| Rockies | 43 | 119 | .265 | 50.0 |
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