Wandy Peralta has the highest win percentage by an active pitcher when pitching in 500+ games, at .571.
| NAME | W% | G | W | L | GS | ERA | 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 | ERA- | FIP | FIP- | H/9 | PRAA | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | W. Peralta | .571 | 502 | 28 | 21 | 2 | 3.77 | 376 | 0 | 0 | 13 | 455.2 | 410 | 191 | 215 | 51 | 200 | 23 | 109 | 11 | 1,959 | 14 | 7.43 | 3.95 | 1.88 | 1.01 | 19.2 | 10.2 | 1.34 | .274 | 4.25 | 90 | 4.44 | 104 | 8.10 | -9.5 |
| 2 |  | A. Chapman | .561 | 863 | 60 | 47 | 0 | 2.52 | 1,331 | 0 | 0 | 367 | 821.1 | 475 | 230 | 255 | 54 | 408 | 33 | 563 | 7 | 3,341 | 87 | 14.58 | 4.47 | 3.26 | 0.59 | 39.8 | 12.2 | 1.08 | .278 | 2.79 | 61 | 2.36 | 57 | 5.20 | 161.8 |
| 3 |  | B. Treinen | .523 | 531 | 45 | 41 | 7 | 2.90 | 596 | 0 | 0 | 82 | 576.1 | 487 | 186 | 213 | 43 | 223 | 20 | 197 | 26 | 2,386 | 24 | 9.31 | 3.48 | 2.67 | 0.67 | 25.0 | 9.3 | 1.23 | .295 | 3.33 | 70 | 3.32 | 80 | 7.60 | 53.5 |
| 4 | | C. Estévez | .463 | 505 | 31 | 36 | 0 | 3.97 | 494 | 0 | 0 | 124 | 485.1 | 455 | 214 | 241 | 59 | 183 | 23 | 249 | 23 | 2,086 | 24 | 9.16 | 3.39 | 2.70 | 1.09 | 23.7 | 8.8 | 1.31 | .298 | 4.47 | 85 | 3.98 | 91 | 8.44 | 22.1 |
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