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| Career Post-Season Winning Pct Leaderboard | |
| * - Indicates Hall of Fame | |
| Bold - Indicates active player |
| Rank | Player | Winning Pct | IP | Last Year | Single Season Leaderboard |
| 1. | Filiberto Guzman | 1.0000 | 32.7 | 2025 | |
| Ernest Davis | 1.0000 | 40.7 | 2013 | ||
| Robert Casanova | 1.0000 | 47.0 | 2008 | ||
| Emmett Parry | 1.0000 | 52.3 | 2007 | ||
| 5. | Henry Cansler | .9286 | 151.0 | 2007 | |
| 6. | Peter Dickey | .9000 | 70.3 | 2025 | |
| Don Satchell | .9000 | 133.0 | 2024 | ||
| 8. | Michael Duval | .8750 | 61.0 | 2015 | |
| 9. | Bob Cowman | .8333 | 47.0 | 2021 | |
| 10. | Gerald Ringler | .8000 | 46.0 | 2025 | |
| Steven Wren | .8000 | 42.0 | 2025 | ||
| Ryosei Atshushi | .8000 | 53.7 | 2022 | ||
| 13. | John Versace | .7778 | 93.6 | 2024 | |
| 14. | Arturo Vannatta | .7500 | 13.7 | 2024 | |
| Lyle Rio | .7500 | 40.3 | 2023 | ||
| Samuel Pierce | .7500 | 24.0 | 2023 | ||
| Charles Denton | .7500 | 42.7 | 2022 | ||
| Wayne Glasgow | .7500 | 38.0 | 2022 | ||
| Leopoldo Echegaray | .7500 | 23.7 | 2018 | ||
| Louis Brown | .7500 | 16.7 | 2016 | ||
| Maurice Young | .7500 | 86.3 | 2013 | ||
| Bobbie Applegate | .7500 | 98.4 | 2012 | ||
| Clarence Thompson | .7500 | 23.7 | 2005 | ||
| Pablo Nolte | .7500 | 36.7 | 2003 | ||
| Robert Teston | .7500 | 32.7 | 2003 | ||
| 26. | James Rhinehart * | .7273 | 113.3 | 2017 | |
| Peter Smitherman | .7273 | 91.3 | 2010 | ||
| 28. | Armando Diaz | .7143 | 46.3 | 2022 | |
| Wilfredo Arguelles | .7143 | 46.6 | 2020 | ||
| Eldridge Oshea | .7143 | 63.0 | 2019 | ||
| Jimmie Slemp | .7143 | 40.3 | 2019 | ||
| Donald Mays | .7143 | 63.6 | 2013 | ||
| 33. | Robert Ferebee | .6875 | 160.0 | 2020 | |
| Kenneth Schrupp | .6875 | 135.1 | 2009 | ||
| 35. | Douglas Morehead | .6667 | 208.6 | 2025 | |
| Clayton Pursel | .6667 | 84.0 | 2024 | ||
| Hansel Bibar | .6667 | 44.7 | 2023 | ||
| Santiago Dion | .6667 | 42.3 | 2016 | ||
| Byron Mauzy | .6667 | 29.3 | 2011 | ||
| Jorge Romriell * | .6667 | 129.6 | 2008 | ||
| 41. | Larry Miller | .6364 | 103.3 | 2025 | |
| 42. | Kevin Turner | .6250 | 87.0 | 2024 | |
| Christian Conley | .6250 | 82.7 | 2024 | ||
| Kelvin Caldera | .6250 | 70.7 | 2015 | ||
| 45. | Ricky Santos | .6000 | 96.7 | 2024 | |
| Christopher Prioleau | .6000 | 25.0 | 2024 | ||
| Fred Bush | .6000 | 95.0 | 2020 | ||
| John Sterling | .6000 | 44.7 | 2020 | ||
| Juan Barnes | .6000 | 45.7 | 2015 | ||
| Joseph Hearon | .6000 | 34.3 | 2014 |
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