50 pitchers are tied for the highest career win percentage in the World Series, at 1.000. The first three are Will Klein, Trey Yesavage and Yoshinobu Yamamoto.
| NAME | W% | SERIES | 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 |  | W. Klein | 1.000 | World Series | 1 | 0 | 2 | 0 | 0.00 | 5 | 0 | 0 | 0 | 5.0 | 2 | 0 | 0 | 0 | 2 | 0 | 2 | 0 | 19 | 1 | 9.00 | 3.60 | 2.50 | 0.00 | 26.3 | 10.5 | 0.80 | .167 | 0.00 | 3.60 |
| 2 |  | T. Yesavage | 1.000 | World Series | 1 | 0 | 3 | 2 | 2.84 | 17 | 0 | 0 | 0 | 12.2 | 8 | 4 | 4 | 2 | 4 | 1 | 0 | 0 | 48 | 0 | 12.08 | 2.84 | 4.25 | 1.42 | 35.4 | 8.3 | 0.95 | .250 | 2.84 | 5.68 |
| 3 |  | Y. Yamamoto | 1.000 | World Series | 4 | 0 | 4 | 3 | 1.13 | 19 | 1 | 0 | 0 | 24.0 | 11 | 3 | 3 | 1 | 4 | 2 | 1 | 0 | 87 | 0 | 7.13 | 1.50 | 4.75 | 0.38 | 21.8 | 4.6 | 0.63 | .164 | 1.13 | 4.13 |
| 4 |  | C. Holmes | 1.000 | World Series | 1 | 0 | 5 | 0 | 0.00 | 6 | 0 | 0 | 0 | 4.1 | 1 | 0 | 0 | 0 | 2 | 1 | 0 | 0 | 16 | 0 | 12.46 | 4.15 | 3.00 | 0.00 | 37.5 | 12.5 | 0.69 | .143 | 0.00 | 2.08 |
| 5 | | A. Heaney | 1.000 | World Series | 1 | 0 | 2 | 1 | 1.59 | 3 | 0 | 0 | 0 | 5.2 | 5 | 1 | 1 | 0 | 2 | 0 | 0 | 0 | 23 | 0 | 4.76 | 3.18 | 1.50 | 0.00 | 13.0 | 8.7 | 1.24 | .278 | 1.59 | 7.94 |
| 6 |  | M. Kelly | 1.000 | World Series | 1 | 0 | 1 | 1 | 1.29 | 9 | 0 | 0 | 0 | 7.0 | 3 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 24 | 0 | 11.57 | 0.00 | 1.29 | 37.5 | 0.0 | 0.43 | .143 | 1.29 | 3.86 | |
| 7 | | J. Gray | 1.000 | World Series | 1 | 0 | 2 | 0 | 0.00 | 7 | 0 | 0 | 0 | 4.2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 16 | 0 | 13.50 | 0.00 | 0.00 | 43.8 | 0.0 | 0.43 | .222 | 0.00 | 3.86 | |
| 8 | | J. Leclerc | 1.000 | World Series | 1 | 0 | 3 | 0 | 0.00 | 4 | 0 | 0 | 1 | 3.1 | 1 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 11 | 0 | 10.80 | 0.00 | 0.00 | 36.4 | 0.0 | 0.30 | .143 | 0.00 | 2.70 | |
| 9 | | S. DomÃnguez | 1.000 | World Series | 2 | 0 | 8 | 0 | 2.35 | 8 | 0 | 0 | 0 | 7.2 | 6 | 2 | 2 | 1 | 7 | 0 | 0 | 0 | 36 | 1 | 9.39 | 8.22 | 1.14 | 1.17 | 22.2 | 19.4 | 1.70 | .250 | 2.35 | 7.04 |
| 10 |  | R. Suarez | 1.000 | World Series | 1 | 0 | 2 | 1 | 0.00 | 5 | 0 | 0 | 0 | 5.2 | 4 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 22 | 0 | 7.94 | 1.59 | 5.00 | 0.00 | 22.7 | 4.5 | 0.88 | .250 | 0.00 | 6.35 |
| 11 | | I. Anderson | 1.000 | World Series | 1 | 0 | 1 | 1 | 0.00 | 4 | 0 | 0 | 0 | 5.0 | 0 | 0 | 0 | 0 | 3 | 1 | 0 | 0 | 18 | 0 | 7.20 | 5.40 | 1.33 | 0.00 | 22.2 | 16.7 | 0.60 | .000 | 0.00 | 0.00 |
| 12 | | T. Matzek | 1.000 | World Series | 1 | 0 | 4 | 0 | 1.69 | 7 | 0 | 0 | 0 | 5.1 | 6 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 21 | 0 | 11.81 | 0.00 | 0.00 | 33.3 | 0.0 | 1.13 | .429 | 1.69 | 10.13 | |
| 13 |  | B. Treinen | 1.000 | World Series | 2 | 0 | 9 | 0 | 5.19 | 12 | 0 | 0 | 1 | 8.2 | 12 | 5 | 5 | 0 | 3 | 1 | 3 | 1 | 42 | 1 | 12.46 | 3.12 | 4.00 | 0.00 | 28.6 | 7.1 | 1.73 | .462 | 5.19 | 12.46 |
| 14 | | J. Curtiss | 1.000 | World Series | 1 | 0 | 3 | 0 | 2.70 | 3 | 0 | 0 | 0 | 3.1 | 4 | 1 | 1 | 1 | 1 | 0 | 2 | 0 | 15 | 0 | 8.10 | 2.70 | 3.00 | 2.70 | 20.0 | 6.7 | 1.50 | .300 | 2.70 | 10.80 |
| 15 | | V. González | 1.000 | World Series | 1 | 0 | 4 | 0 | 2.45 | 3 | 0 | 0 | 0 | 3.2 | 2 | 1 | 1 | 0 | 2 | 0 | 0 | 0 | 14 | 1 | 7.36 | 4.91 | 1.50 | 0.00 | 21.4 | 14.3 | 1.09 | .222 | 2.45 | 4.91 |
| 16 | | J. Urquidy | 1.000 | World Series | 3 | 0 | 5 | 2 | 1.23 | 15 | 0 | 0 | 0 | 14.2 | 11 | 2 | 2 | 1 | 1 | 0 | 2 | 0 | 56 | 2 | 9.20 | 0.61 | 15.00 | 0.61 | 26.8 | 1.8 | 0.82 | .256 | 1.23 | 6.75 |
| 17 | | J. James | 1.000 | World Series | 1 | 0 | 3 | 0 | 10.80 | 5 | 0 | 0 | 0 | 1.2 | 2 | 2 | 4 | 1 | 3 | 0 | 0 | 0 | 11 | 0 | 27.00 | 16.20 | 1.67 | 5.40 | 45.5 | 27.3 | 3.00 | .500 | 21.60 | 10.80 |
| 18 |  | S. Strasburg | 1.000 | World Series | 2 | 0 | 2 | 2 | 2.51 | 14 | 0 | 0 | 0 | 14.1 | 12 | 4 | 4 | 2 | 3 | 0 | 0 | 1 | 58 | 1 | 8.79 | 1.88 | 4.67 | 1.26 | 24.1 | 5.2 | 1.05 | .256 | 2.51 | 7.53 |
| 19 |  | W. Buehler | 1.000 | World Series | 2 | 0 | 4 | 3 | 0.47 | 24 | 0 | 0 | 1 | 19.0 | 7 | 1 | 1 | 0 | 3 | 0 | 1 | 0 | 64 | 0 | 11.37 | 1.42 | 8.00 | 0.00 | 37.5 | 4.7 | 0.53 | .189 | 0.47 | 3.32 |
| 20 | | M. Barnes | 1.000 | World Series | 1 | 0 | 3 | 0 | 0.00 | 4 | 0 | 0 | 0 | 2.1 | 2 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 10 | 1 | 15.43 | 3.86 | 4.00 | 0.00 | 40.0 | 10.0 | 1.29 | .400 | 0.00 | 7.71 |
| 21 | | A. Wood | 1.000 | World Series | 1 | 0 | 7 | 1 | 1.93 | 13 | 0 | 0 | 0 | 14.0 | 6 | 3 | 3 | 2 | 4 | 0 | 3 | 1 | 50 | 0 | 8.36 | 2.57 | 3.25 | 1.29 | 26.0 | 8.0 | 0.71 | .129 | 1.93 | 3.86 |
| 22 | | J. Musgrove | 1.000 | World Series | 1 | 0 | 4 | 0 | 6.75 | 2 | 0 | 0 | 0 | 4.0 | 3 | 3 | 3 | 2 | 1 | 0 | 2 | 1 | 16 | 0 | 4.50 | 2.25 | 2.00 | 4.50 | 12.5 | 6.3 | 1.00 | .091 | 6.75 | 6.75 |
| 23 | | T. Watson | 1.000 | World Series | 2 | 0 | 5 | 0 | 0.00 | 1 | 0 | 0 | 0 | 3.2 | 2 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 14 | 0 | 2.45 | 2.45 | 1.00 | 0.00 | 7.1 | 7.1 | 0.82 | .182 | 2.45 | 4.91 |
| 24 | | C. Devenski | 1.000 | World Series | 1 | 0 | 8 | 0 | 7.88 | 8 | 0 | 0 | 0 | 8.0 | 7 | 7 | 7 | 3 | 2 | 1 | 5 | 0 | 34 | 0 | 9.00 | 2.25 | 4.00 | 3.38 | 23.5 | 5.9 | 1.13 | .200 | 7.88 | 7.88 |
| 25 |  | J. Arrieta | 1.000 | World Series | 2 | 0 | 2 | 2 | 2.38 | 15 | 0 | 0 | 0 | 11.1 | 5 | 3 | 3 | 1 | 6 | 1 | 0 | 0 | 46 | 1 | 11.91 | 4.76 | 2.50 | 0.79 | 32.6 | 13.0 | 0.97 | .174 | 2.38 | 3.97 |
StatMuse has game-level data for pitcher win percentage going back to the 1903 playoffs.
Some of the information used here was obtained free of charge from Retrosheet.
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