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| Single-Season Winning Pct Leaderboard | |
| * - Indicates Hall of Fame |
| Rank | Player | Winning Pct | IP | Year | Career Leaderboard |
| 1. | Kevin Smith | .9677 | 309.0 | 2029 | |
| 2. | Carmine Whittingham | .9545 | 220.7 | 2018 | |
| Robert Garza * | .9545 | 238.7 | 2010 | ||
| 4. | Clarence McNatt * | .9375 | 195.7 | 2007 | |
| 5. | Jonathan Alexander | .9231 | 249.0 | 2023 | |
| 6. | James Alexander | .9091 | 232.0 | 2019 | |
| 7. | Richard San Juan | .9048 | 250.7 | 2024 | |
| 8. | Dennis Morelock * | .8966 | 289.3 | 2011 | |
| 9. | Thomas Showers * | .8947 | 205.7 | 2009 | |
| 10. | Adam Burton | .8824 | 164.7 | 2016 | |
| Leo Cleland * | .8824 | 220.0 | 2014 | ||
| James Yim * | .8824 | 304.0 | 2007 | ||
| 13. | Manuel Nieves | .8800 | 245.3 | 2024 | |
| 14. | Chad Schmidt | .8750 | 259.0 | 2026 | |
| Ryan Turner * | .8750 | 250.7 | 2014 | ||
| Armando Quinonez * | .8750 | 256.7 | 2003 | ||
| 17. | David Echegaray | .8710 | 280.0 | 2015 | |
| 18. | Danny Day | .8667 | 257.3 | 2018 | |
| 19. | Jeff Waldrep | .8636 | 203.3 | 2016 | |
| Robert Garza * | .8636 | 206.7 | 2012 | ||
| George Aybar | .8636 | 206.0 | 2007 | ||
| 22. | Wayne Sorely | .8621 | 247.3 | 2027 | |
| 23. | Armando Mesta | .8571 | 237.3 | 2028 | |
| 24. | Armando Mesta | .8519 | 257.0 | 2025 | |
| Andrew Albury | .8519 | 230.7 | 2006 | ||
| 26. | Jacob Perl | .8500 | 178.0 | 2018 | |
| 27. | Chale Crespa | .8462 | 239.7 | 2024 | |
| Artur Sax | .8462 | 238.7 | 2019 | ||
| David Echegaray | .8462 | 227.0 | 2017 | ||
| Andrew Albury | .8462 | 216.3 | 2008 | ||
| 31. | Ryan Turner * | .8438 | 275.7 | 2007 | |
| 32. | Brandon Coto | .8421 | 169.0 | 2013 | |
| 33. | J.J. Cobb | .8400 | 248.0 | 2011 | |
| 34. | James Yim * | .8387 | 297.7 | 2009 | |
| 35. | Chad Schmidt | .8333 | 292.3 | 2029 | |
| Carlos Horizon | .8333 | 202.3 | 2029 | ||
| Todd Neary | .8333 | 231.3 | 2028 | ||
| Ralph Ives | .8333 | 249.0 | 2024 | ||
| J.L. Carrillo | .8333 | 213.3 | 2023 | ||
| Higinio Delmonte | .8333 | 219.7 | 2018 | ||
| Art Toczek * | .8333 | 212.7 | 2018 | ||
| Ben Lamela | .8333 | 214.0 | 2013 | ||
| James Yim * | .8333 | 291.7 | 2008 | ||
| George Aybar | .8333 | 240.7 | 2008 | ||
| Leo Cleland * | .8333 | 211.0 | 2008 | ||
| Angelo Arroyo | .8333 | 219.0 | 2000 | ||
| 47. | Xalbador Laguna | .8276 | 237.0 | 2027 | |
| 48. | James Alexander | .8261 | 198.0 | 2021 | |
| Joseph Bingman | .8261 | 222.3 | 2011 | ||
| 50. | Harry Kirton | .8235 | 165.3 | 2028 | |
| Donald Pink | .8235 | 191.0 | 2026 | ||
| Geoff Stagner | .8235 | 146.7 | 2017 | ||
| 53. | Herc Columbie | .8182 | 253.3 | 2027 | |
| Chad Schmidt | .8182 | 227.7 | 2022 | ||
| J.L. Carrillo | .8182 | 193.3 | 2022 | ||
| Lowell Stang * | .8182 | 241.3 | 2015 | ||
| Clarence McNatt * | .8182 | 225.7 | 2014 | ||
| 58. | Dennis Couch | .8148 | 240.0 | 2027 | |
| 59. | Kevin Smith | .8125 | 298.0 | 2028 | |
| Gilbert Giglio | .8125 | 164.0 | 2026 | ||
| James Alexander | .8125 | 184.3 | 2020 | ||
| Luis Alou | .8125 | 128.0 | 2019 | ||
| Benicio Andaverde | .8125 | 163.7 | 2017 | ||
| David Smith | .8125 | 88.3 | 2010 | ||
| Omar Alvarado | .8125 | 97.3 | 2006 | ||
| David Scoggin | .8125 | 152.0 | 2003 | ||
| 67. | Ben Lamela | .8095 | 222.3 | 2020 | |
| Fred Washington | .8095 | 183.3 | 2017 | ||
| Armand Banuelos | .8095 | 230.0 | 2005 | ||
| 70. | Richard San Juan | .8077 | 256.3 | 2021 | |
| David Echegaray | .8077 | 256.3 | 2020 | ||
| Art Toczek * | .8077 | 245.0 | 2013 | ||
| Clarence McNatt * | .8077 | 283.3 | 2008 | ||
| Leonard Lubbers | .8077 | 257.3 | 2007 | ||
| Benjamin Alcala | .8077 | 261.3 | 2002 | ||
| 76. | Steven Williams * | .8065 | 276.0 | 2008 | |
| Ryan Turner * | .8065 | 296.7 | 2006 | ||
| Jeffrey Cargo | .8065 | 257.0 | 2006 | ||
| 79. | Humberto Deleon | .8000 | 166.0 | 2028 | |
| J.L. Carrillo | .8000 | 231.3 | 2024 | ||
| Blitz Codd | .8000 | 230.3 | 2024 | ||
| J.J. Cobb | .8000 | 225.0 | 2014 | ||
| Leo Cleland * | .8000 | 220.7 | 2013 | ||
| Leo Cleland * | .8000 | 202.0 | 2011 | ||
| Claudio Romeo | .8000 | 247.7 | 2002 | ||
| 86. | Kevin Smith | .7931 | 278.7 | 2027 | |
| Kevin Smith | .7931 | 276.7 | 2026 | ||
| Ryan Turner * | .7931 | 271.7 | 2008 | ||
| 89. | Jacob Perl | .7917 | 226.7 | 2028 | |
| J.L. Carrillo | .7917 | 234.3 | 2026 | ||
| Manuel Nieves | .7917 | 236.3 | 2025 | ||
| Ralph Ives | .7917 | 260.3 | 2022 | ||
| Benny Suarez | .7917 | 254.3 | 2022 | ||
| Kazuma Sen | .7917 | 247.7 | 2021 | ||
| David Echegaray | .7917 | 259.0 | 2014 | ||
| George Aybar | .7917 | 256.7 | 2011 | ||
| William Piccolo | .7917 | 207.3 | 2004 | ||
| 98. | Herbert Castillo | .7895 | 159.0 | 2027 | |
| Higinio Delmonte | .7895 | 190.0 | 2021 | ||
| Danny Richards | .7895 | 150.3 | 2019 |
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