Since 2000, 49 pitchers are tied for the lowest ERA by an NL West relief pitcher in a season, with an ERA of 0.00. The first three are Austin Pope, Clayton Kershaw and Roki Sasaki in 2025.
| 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 |  | A. Pope | 0.00 | 2025 |  AZ | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 2.0 | 2 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 9 | 0 | 4.50 | 4.50 | 1.00 | 0.00 | 11.1 | 11.1 | 1.50 | .286 | 0.00 | 9.00 | |
| 2 |  | C. Kershaw | 0.00 | 2025 |  LAD | 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 | ||
| 3 |  | R. Sasaki | 0.00 | 2025 | LAD | 2 | 0 | 0 | 0 | 4 | 0 | 0 | 0 | 2.0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 0 | 18.00 | 0.00 | 0.00 | 57.1 | 0.0 | 0.50 | .333 | 0.00 | 4.50 | ||
| 4 | | K. Teng | 0.00 | 2025 |  SFG | 1 | 1 | 0 | 1.000 | 0 | 4 | 0 | 0 | 0 | 5.0 | 3 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 18 | 0 | 7.20 | 1.80 | 4.00 | 0.00 | 22.2 | 5.6 | 0.80 | .231 | 0.00 | 5.40 |
| 5 | | C. Kelly | 0.00 | 2025 | AZ | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.2 | 1 | 0 | 0 | 0 | 1 | 0 | 2 | 0 | 6 | 1 | 0.00 | 5.40 | 0.00 | 0.00 | 0.0 | 16.7 | 1.20 | .200 | 0.00 | 5.40 | |
| 6 | | D. May | 0.00 | 2025 | LAD | 1 | 1 | 0 | 1.000 | 0 | 4 | 0 | 0 | 0 | 4.2 | 5 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 21 | 0 | 7.71 | 5.79 | 1.33 | 0.00 | 19.0 | 14.3 | 1.71 | .357 | 0.00 | 9.64 |
| 7 | | C. Montes De Oca | 0.00 | 2025 | AZ | 1 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 2.2 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 9 | 0 | 6.75 | 3.38 | 2.00 | 0.00 | 22.2 | 11.1 | 0.38 | .000 | 0.00 | 0.00 | |
| 8 | | A. Trejo | 0.00 | 2025 |  COL | 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 | ||
| 9 | | R. Bergert | 0.00 | 2025 |  SDP | 4 | 1 | 0 | 1.000 | 0 | 2 | 0 | 0 | 0 | 4.0 | 1 | 0 | 0 | 0 | 0 | 1 | 2 | 0 | 14 | 0 | 4.50 | 0.00 | 0.00 | 14.3 | 0.0 | 0.25 | .091 | 0.00 | 2.25 | |
| 10 | | C. Koss | 0.00 | 2025 | SFG | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4.0 | 4 | 0 | 0 | 0 | 0 | 0 | 4 | 0 | 16 | 0 | 0.00 | 0.00 | 0.00 | 0.0 | 0.0 | 1.00 | .250 | 0.00 | 9.00 | ||
| 11 | | E. Phillips | 0.00 | 2025 | LAD | 7 | 0 | 0 | 0 | 6 | 0 | 0 | 1 | 5.2 | 4 | 0 | 0 | 0 | 2 | 0 | 1 | 0 | 22 | 0 | 9.53 | 3.18 | 3.00 | 0.00 | 27.3 | 9.1 | 1.06 | .286 | 0.00 | 6.35 | |
| 12 | | 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 | |
| 13 | | 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 | ||
| 14 | | 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 | ||
| 15 | | 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 | |
| 16 | | 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 | ||
| 17 | | C. Shreve | 0.00 | 2024 | COL | 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 | ||
| 18 | | P. Smith | 0.00 | 2024 | ARI | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 5 | 0 | 0.00 | 9.00 | 0.00 | 0.00 | 0.0 | 20.0 | 1.00 | .000 | 0.00 | 0.00 | |
| 19 | | E. Salazar | 0.00 | 2024 | LAD | 1 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 2.0 | 3 | 0 | 1 | 0 | 2 | 0 | 1 | 0 | 10 | 0 | 13.50 | 9.00 | 1.50 | 0.00 | 30.0 | 20.0 | 2.50 | .600 | 4.50 | 13.50 | |
| 20 | | R. Nelson | 0.00 | 2023 |  ARI | 2 | 1 | 0 | 1.000 | 0 | 5 | 0 | 0 | 0 | 5.2 | 1 | 0 | 0 | 0 | 2 | 0 | 1 | 0 | 20 | 0 | 7.94 | 3.18 | 2.50 | 0.00 | 25.0 | 10.0 | 0.53 | .077 | 0.00 | 1.59 |
| 21 | | J. Espada | 0.00 | 2023 | SDP | 1 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 2 | 0 | 1 | 0 | 5 | 0 | 18.00 | 18.00 | 1.00 | 0.00 | 40.0 | 40.0 | 2.00 | .000 | 0.00 | 0.00 | |
| 22 | | S. Zavala | 0.00 | 2023 | ARI | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.2 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 2 | 0 | 0.00 | 0.00 | 0.00 | 0.0 | 0.0 | 0.00 | .000 | 0.00 | 0.00 | ||
| 23 | | K. Hurt | 0.00 | 2023 | LAD | 1 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 2.0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 6 | 0 | 13.50 | 0.00 | 0.00 | 50.0 | 0.0 | 0.00 | .000 | 0.00 | 0.00 | ||
| 24 | | A. Saalfrank | 0.00 | 2023 | ARI | 10 | 0 | 0 | 0 | 6 | 0 | 0 | 0 | 10.1 | 7 | 0 | 2 | 0 | 4 | 0 | 0 | 1 | 41 | 0 | 5.23 | 3.48 | 1.50 | 0.00 | 14.6 | 9.8 | 1.06 | .226 | 1.74 | 6.10 | |
| 25 | | P. Strzelecki | 0.00 | 2023 | ARI | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1.1 | 1 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 7 | 0 | 0.00 | 13.50 | 0.00 | 0.00 | 0.0 | 28.6 | 2.25 | .200 | 0.00 | 6.75 | |
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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