Since 1900, 50 pitchers are tied for the highest win percentage by a starting pitcher, at 1.000. The first three are River Ryan, Spencer Bivens and Jackson Wolf.
| NAME | W% | W | L | G | 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 | H/9 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | R. Ryan | 1.000 | 1 | 0 | 4 | 4 | 1.33 | 18 | 0 | 0 | 0 | 20.1 | 15 | 3 | 4 | 1 | 9 | 0 | 0 | 0 | 81 | 0 | 7.97 | 3.98 | 2.00 | 0.44 | 22.2 | 11.1 | 1.18 | .264 | 1.77 | 6.64 |
| 2 | | S. Bivens | 1.000 | 1 | 0 | 2 | 2 | 1.93 | 6 | 0 | 0 | 0 | 9.1 | 8 | 2 | 2 | 2 | 1 | 0 | 0 | 0 | 37 | 0 | 5.79 | 0.96 | 6.00 | 1.93 | 16.2 | 2.7 | 0.96 | .214 | 1.93 | 7.71 |
| 3 | | J. Wolf | 1.000 | 1 | 0 | 1 | 1 | 5.40 | 1 | 0 | 0 | 0 | 5.0 | 6 | 3 | 3 | 0 | 1 | 0 | 0 | 0 | 22 | 0 | 1.80 | 1.80 | 1.00 | 0.00 | 4.5 | 4.5 | 1.40 | .300 | 5.40 | 10.80 |
| 4 | | B. Garcia | 1.000 | 2 | 0 | 4 | 4 | 3.54 | 17 | 0 | 0 | 0 | 20.1 | 14 | 8 | 8 | 3 | 10 | 3 | 0 | 0 | 84 | 1 | 7.52 | 4.43 | 1.70 | 1.33 | 20.2 | 11.9 | 1.18 | .216 | 3.54 | 6.20 |
| 5 | | N. Crismatt | 1.000 | 2 | 0 | 6 | 6 | 2.79 | 21 | 0 | 0 | 0 | 29.0 | 28 | 9 | 13 | 3 | 7 | 1 | 0 | 0 | 121 | 1 | 6.52 | 2.17 | 3.00 | 0.93 | 17.4 | 5.8 | 1.21 | .281 | 4.03 | 8.69 |
| 6 | | B. Braymer | 1.000 | 1 | 0 | 1 | 1 | 0.00 | 4 | 0 | 0 | 0 | 5.0 | 1 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 19 | 0 | 7.20 | 5.40 | 1.33 | 0.00 | 21.1 | 15.8 | 0.80 | .083 | 0.00 | 1.80 |
| 7 | | J. James | 1.000 | 2 | 0 | 6 | 6 | 4.43 | 29 | 0 | 0 | 0 | 22.1 | 15 | 11 | 11 | 4 | 17 | 2 | 0 | 0 | 98 | 2 | 11.69 | 6.85 | 1.71 | 1.61 | 29.6 | 17.3 | 1.43 | .239 | 4.43 | 6.04 |
| 8 | | F. Jorge | 1.000 | 1 | 0 | 2 | 2 | 10.57 | 4 | 0 | 0 | 0 | 7.2 | 14 | 9 | 9 | 4 | 2 | 0 | 0 | 0 | 36 | 0 | 4.70 | 2.35 | 2.00 | 4.70 | 11.1 | 5.6 | 2.09 | .385 | 10.57 | 16.43 |
| 9 | | F. Martes | 1.000 | 2 | 0 | 4 | 4 | 4.08 | 21 | 0 | 0 | 0 | 17.2 | 15 | 8 | 8 | 1 | 10 | 2 | 0 | 0 | 76 | 1 | 10.70 | 5.09 | 2.10 | 0.51 | 27.6 | 13.2 | 1.42 | .333 | 4.08 | 7.64 |
| 10 | | T. Danish | 1.000 | 1 | 0 | 1 | 1 | 0.00 | 6 | 0 | 0 | 0 | 5.0 | 3 | 0 | 0 | 0 | 6 | 0 | 0 | 0 | 23 | 0 | 10.80 | 10.80 | 1.00 | 0.00 | 26.1 | 26.1 | 1.80 | .273 | 0.00 | 5.40 |
| 11 | | R. Merritt | 1.000 | 3 | 0 | 5 | 5 | 1.82 | 11 | 0 | 0 | 0 | 24.2 | 28 | 5 | 7 | 0 | 4 | 0 | 0 | 0 | 102 | 0 | 4.01 | 1.46 | 2.75 | 0.00 | 10.8 | 3.9 | 1.30 | .322 | 2.55 | 10.22 |
| 12 | | A. Reyes | 1.000 | 2 | 0 | 7 | 7 | 1.87 | 33 | 0 | 0 | 0 | 33.2 | 28 | 7 | 8 | 0 | 18 | 1 | 0 | 0 | 141 | 1 | 8.82 | 4.81 | 1.83 | 0.00 | 23.4 | 12.8 | 1.37 | .315 | 2.14 | 7.49 |
| 13 | | I. Thomas | 1.000 | 1 | 0 | 1 | 1 | 1.80 | 5 | 0 | 0 | 0 | 5.0 | 3 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 17 | 0 | 9.00 | 0.00 | 0.00 | 29.4 | 0.0 | 0.60 | .250 | 1.80 | 5.40 | |
| 14 | | P. Klein | 1.000 | 1 | 0 | 4 | 4 | 6.61 | 12 | 0 | 0 | 0 | 16.1 | 23 | 12 | 13 | 3 | 6 | 0 | 0 | 1 | 77 | 0 | 6.61 | 3.31 | 2.00 | 1.65 | 15.6 | 7.8 | 1.78 | .357 | 7.16 | 12.67 |
| 15 | | T. Cooney | 1.000 | 1 | 0 | 6 | 6 | 3.16 | 29 | 0 | 0 | 0 | 31.1 | 28 | 11 | 12 | 3 | 10 | 1 | 0 | 2 | 130 | 1 | 8.33 | 2.87 | 2.90 | 0.86 | 22.3 | 7.7 | 1.21 | .287 | 3.45 | 8.04 |
| 16 | | C. Sadler | 1.000 | 1 | 0 | 2 | 2 | 3.18 | 6 | 0 | 0 | 0 | 5.2 | 5 | 2 | 3 | 1 | 1 | 0 | 0 | 0 | 23 | 0 | 9.53 | 1.59 | 6.00 | 1.59 | 26.1 | 4.3 | 1.06 | .267 | 4.76 | 7.94 |
| 17 | | J. Gast | 1.000 | 2 | 0 | 3 | 3 | 5.11 | 8 | 0 | 0 | 0 | 12.1 | 11 | 7 | 7 | 1 | 5 | 0 | 0 | 0 | 52 | 0 | 5.84 | 3.65 | 1.60 | 0.73 | 15.4 | 9.6 | 1.30 | .263 | 5.11 | 8.03 |
| 18 | | Z. Kroenke | 1.000 | 1 | 0 | 1 | 1 | 1.80 | 1 | 0 | 0 | 0 | 5.0 | 2 | 1 | 1 | 1 | 2 | 0 | 0 | 0 | 18 | 0 | 1.80 | 3.60 | 0.50 | 1.80 | 5.6 | 11.1 | 0.80 | .071 | 1.80 | 3.60 |
| 19 | | D. Carpenter | 1.000 | 1 | 0 | 1 | 1 | 10.38 | 4 | 0 | 0 | 0 | 4.1 | 8 | 5 | 5 | 0 | 3 | 1 | 0 | 0 | 24 | 0 | 8.31 | 6.23 | 1.33 | 0.00 | 16.7 | 12.5 | 2.54 | .500 | 10.38 | 16.62 |
| 20 | | B. Bass | 1.000 | 1 | 0 | 4 | 4 | 4.19 | 13 | 0 | 0 | 0 | 19.1 | 14 | 9 | 11 | 1 | 7 | 1 | 0 | 1 | 77 | 2 | 6.05 | 3.26 | 1.86 | 0.47 | 16.9 | 9.1 | 1.09 | .236 | 5.12 | 6.52 |
| 21 | | S. Lewis | 1.000 | 4 | 0 | 5 | 5 | 3.49 | 18 | 0 | 0 | 0 | 28.1 | 27 | 11 | 13 | 6 | 7 | 0 | 0 | 0 | 117 | 1 | 5.72 | 2.22 | 2.57 | 1.91 | 15.4 | 6.0 | 1.20 | .244 | 4.13 | 8.58 |
| 22 | | J. Parr | 1.000 | 1 | 0 | 5 | 5 | 4.84 | 14 | 0 | 0 | 0 | 22.1 | 29 | 12 | 13 | 4 | 9 | 0 | 0 | 0 | 102 | 1 | 5.64 | 3.63 | 1.56 | 1.61 | 13.7 | 8.8 | 1.70 | .333 | 5.24 | 11.69 |
| 23 | | B. Knight | 1.000 | 1 | 0 | 2 | 2 | 5.40 | 9 | 0 | 0 | 0 | 10.0 | 13 | 6 | 6 | 0 | 6 | 2 | 0 | 0 | 49 | 0 | 8.10 | 5.40 | 1.50 | 0.00 | 18.4 | 12.2 | 1.90 | .406 | 5.40 | 11.70 |
| 24 | | N. Adenhart | 1.000 | 1 | 0 | 4 | 4 | 6.00 | 9 | 0 | 0 | 0 | 18.0 | 25 | 12 | 12 | 0 | 16 | 0 | 0 | 0 | 90 | 3 | 4.50 | 8.00 | 0.56 | 0.00 | 10.0 | 17.8 | 2.28 | .385 | 6.00 | 12.50 |
| 25 | | L. Broadway | 1.000 | 2 | 0 | 2 | 2 | 1.59 | 9 | 0 | 0 | 0 | 11.1 | 7 | 2 | 2 | 0 | 4 | 0 | 0 | 0 | 45 | 0 | 7.15 | 3.18 | 2.25 | 0.00 | 20.0 | 8.9 | 0.97 | .219 | 1.59 | 5.56 |
StatMuse has game-level data for pitcher win percentage going back to the 1901 season.
Some of the information used here was obtained free of charge from Retrosheet.
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45 | 23 | .662 | ||
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40 | 25 | .615 | ||
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