| Home | Players | Teams | Leagues | Managers | Leaderboards | Win Shares | Awards | Help | |
| Single-Season Winning Pct Leaderboard | |
| * - Indicates Hall of Fame |
| Rank | Player | Winning Pct | IP | Year | Career Leaderboard |
| 1. | Lewis Washburn | .9643 | 257.7 | 2019 | |
| 2. | Silvio Santacruz | .9545 | 255.0 | 2019 | |
| J.D. Martin | .9545 | 231.0 | 2018 | ||
| 4. | Larry Strope | .9286 | 261.0 | 2009 | |
| 5. | Dennis Baley | .9231 | 253.7 | 2022 | |
| 6. | Amadeo Samaniego | .8947 | 188.3 | 2016 | |
| 7. | Augustine Stearn | .8929 | 242.0 | 2022 | |
| 8. | Mark Prior * | .8889 | 206.3 | 2014 | |
| 9. | Daniel Scott | .8846 | 243.0 | 2015 | |
| Roy Halladay | .8846 | 240.7 | 2008 | ||
| 11. | Felipe Granados | .8800 | 241.3 | 2020 | |
| Condel Ortiz | .8800 | 257.3 | 2017 | ||
| 13. | Thomas Gries | .8750 | 222.3 | 2018 | |
| Freddie Cooley | .8750 | 257.3 | 2016 | ||
| Mark Prior * | .8750 | 260.7 | 2005 | ||
| 16. | Lewis Washburn | .8696 | 239.0 | 2021 | |
| Joseph Delagarza | .8696 | 224.7 | 2021 | ||
| 18. | J.D. Martin | .8636 | 245.0 | 2010 | |
| 19. | Augustine Stearn | .8621 | 248.3 | 2021 | |
| Roger Heitman | .8621 | 249.0 | 2013 | ||
| 21. | Roger Heitman | .8571 | 235.3 | 2018 | |
| Bennie Hamblin | .8571 | 224.0 | 2017 | ||
| Jason Schmidt | .8571 | 261.3 | 2005 | ||
| 24. | Steven Hildebrant | .8519 | 226.0 | 2022 | |
| Roy Halladay | .8519 | 275.0 | 2009 | ||
| 26. | Silvio Santacruz | .8462 | 232.7 | 2020 | |
| Dontrelle Willis | .8462 | 220.0 | 2006 | ||
| Roy Oswalt | .8462 | 235.0 | 2005 | ||
| 29. | J.D. Martin | .8333 | 234.3 | 2019 | |
| J.D. Martin | .8333 | 224.3 | 2017 | ||
| Carlos Zambrano | .8333 | 212.7 | 2016 | ||
| J.D. Martin | .8333 | 209.7 | 2016 | ||
| Freddie Cooley | .8333 | 263.3 | 2013 | ||
| 34. | Mark Prior * | .8276 | 244.3 | 2011 | |
| 35. | Paul Hageman | .8261 | 212.7 | 2020 | |
| 36. | Joseph Delagarza | .8235 | 169.0 | 2019 | |
| Willie Leon | .8235 | 160.0 | 2018 | ||
| Matt Clement | .8235 | 163.7 | 2004 | ||
| 39. | Zachery Hickman | .8214 | 245.0 | 2022 | |
| Willie Leon | .8214 | 250.7 | 2020 | ||
| Silvio Santacruz | .8214 | 253.3 | 2017 | ||
| 42. | Anthony Lezama | .8182 | 246.7 | 2017 | |
| Hosea Buendia | .8182 | 228.3 | 2015 | ||
| Stanley Middaugh | .8182 | 204.7 | 2015 | ||
| Rick Ankiel | .8182 | 205.7 | 2013 | ||
| Josh Beckett | .8182 | 221.0 | 2006 | ||
| Josh Beckett | .8182 | 228.3 | 2004 | ||
| 48. | Mark Prior * | .8148 | 252.3 | 2013 | |
| Roy Halladay | .8148 | 268.7 | 2010 | ||
| Mark Buehrle | .8148 | 259.0 | 2005 | ||
| 51. | Korey Mathison | .8125 | 261.7 | 2019 | |
| Mark Prior * | .8125 | 185.7 | 2015 | ||
| 53. | J.D. Martin | .8095 | 216.0 | 2020 | |
| Tony Armas | .8095 | 167.0 | 2011 | ||
| 55. | Brian Anderson | .8077 | 263.7 | 2020 | |
| Jeremy Bonderman | .8077 | 238.7 | 2012 | ||
| 57. | Nick Younker | .8000 | 240.3 | 2019 | |
| Steven Maney | .8000 | 215.7 | 2016 | ||
| 59. | Mark Prior * | .7931 | 279.3 | 2009 | |
| 60. | Eric Losey | .7917 | 245.7 | 2021 | |
| Amadis Rodriguez | .7917 | 227.0 | 2021 | ||
| Randy Wolf | .7917 | 220.0 | 2009 | ||
| 63. | Brian Anderson | .7857 | 239.0 | 2022 | |
| Glen Rakestraw | .7857 | 239.7 | 2010 | ||
| 65. | Anthony Lezama | .7826 | 244.3 | 2018 | |
| J.D. Martin | .7826 | 257.7 | 2009 | ||
| Mark Prior * | .7826 | 264.0 | 2006 | ||
| Kazuhisa Ishii | .7826 | 184.3 | 2006 | ||
| 69. | Korey Mathison | .7813 | 290.7 | 2021 | |
| 70. | Lewis Washburn | .7778 | 238.0 | 2022 | |
| Jonathan Nabors | .7778 | 113.3 | 2020 | ||
| Roger Heitman | .7778 | 266.3 | 2012 | ||
| Mark Prior * | .7778 | 238.7 | 2008 | ||
| Larry Strope | .7778 | 237.3 | 2008 | ||
| Matt Morris | .7778 | 235.7 | 2007 | ||
| Jay Witasick | .7778 | 171.7 | 2005 | ||
| Roy Oswalt | .7778 | 268.7 | 2004 | ||
| 78. | David Martinez | .7742 | 265.0 | 2019 | |
| Javier Vazquez | .7742 | 280.7 | 2009 | ||
| 80. | Josef Soliz | .7727 | 207.7 | 2020 | |
| Roy Halladay | .7727 | 243.0 | 2012 | ||
| Felix Hernandez | .7727 | 186.0 | 2012 | ||
| Toshikazu Yoshiaki | .7727 | 182.7 | 2009 | ||
| 84. | Brian Anderson | .7692 | 285.3 | 2019 | |
| Roger Heitman | .7692 | 224.0 | 2019 | ||
| Augustine Stearn | .7692 | 236.7 | 2018 | ||
| Richard Menzies | .7692 | 210.7 | 2015 | ||
| Roger Heitman | .7692 | 210.7 | 2015 | ||
| Willian Larson | .7692 | 213.3 | 2014 | ||
| Josh Beckett | .7692 | 222.7 | 2008 | ||
| 91. | William Gibson | .7647 | 142.0 | 2019 | |
| Paul Hageman | .7647 | 186.3 | 2018 | ||
| Ryan Jameson | .7647 | 149.7 | 2017 | ||
| Rick Ankiel | .7647 | 200.7 | 2012 | ||
| Rich Harden | .7647 | 120.0 | 2005 | ||
| 96. | Kevin Rockey | .7619 | 216.3 | 2019 | |
| Mark Prior * | .7619 | 227.7 | 2018 | ||
| Roger Heitman | .7619 | 170.7 | 2017 | ||
| Mark Prior * | .7619 | 210.3 | 2016 | ||
| Ronald Bay | .7619 | 174.3 | 2013 |
| For questions or to report errors, please send us a note. |