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| Career Post-Season Losses Leaderboard | |
| * - Indicates Hall of Fame Bold - Indicates active player |
| Rank | Player | Losses | IP | Years | Single Season Leaderboard |
| 1. | Roger Kirwan | 3 | 62.3 | 1947-1950 | |
| Lavern Bessler | 3 | 57.3 | 1947-1950 | ||
| Chet Seiler | 3 | 46.0 | 1947-1950 | ||
| Corey Hill | 3 | 45.0 | 1947-1950 | ||
| Gerald Sarno | 3 | 49.0 | 1948-1949 | ||
| James Wells | 3 | 32.3 | 1947-1949 | ||
| 7. | James Hanselman | 2 | 85.0 | 1947-1950 | |
| Lucien Pillar | 2 | 82.0 | 1947-1950 | ||
| William Noriega | 2 | 27.7 | 1947-1950 | ||
| Robert Carreiro | 2 | 16.0 | 1948-1950 | ||
| Roland Wright | 2 | 12.7 | 1947-1950 | ||
| Jose Acosta | 2 | 11.0 | 1950-1950 | ||
| Robert Lerman | 2 | 10.7 | 1950-1950 | ||
| Stan Lugo | 2 | 48.3 | 1947-1949 | ||
| Michael Edwards | 2 | 25.7 | 1947-1949 | ||
| Stephen McMaster | 2 | 18.7 | 1948-1949 | ||
| Philip Farrell | 2 | 16.7 | 1947-1949 | ||
| Virgil Rice | 2 | 8.7 | 1948-1949 | ||
| Samuel Gabbert | 2 | 5.7 | 1948-1949 | ||
| Paul Bravo | 2 | 5.3 | 1947-1947 | ||
| 21. | Casey Stutzman | 1 | 34.7 | 1947-1950 | |
| Joshua Cook | 1 | 34.3 | 1947-1950 | ||
| Trey Bunch | 1 | 14.0 | 1947-1950 | ||
| Earle Olivier | 1 | 13.0 | 1950-1950 | ||
| Hiram Porter | 1 | 11.7 | 1950-1950 | ||
| Thomas Lemmons | 1 | 6.3 | 1947-1950 | ||
| Samuel Perera | 1 | 3.3 | 1950-1950 | ||
| Dwight Roesch | 1 | 67.0 | 1947-1949 | ||
| Edwin Dummer | 1 | 25.0 | 1947-1949 | ||
| Lamont Ayer | 1 | 19.3 | 1947-1949 | ||
| James Riordan | 1 | 16.0 | 1948-1949 | ||
| Freddy Varada | 1 | 11.7 | 1948-1949 | ||
| John Geist | 1 | 11.3 | 1947-1949 | ||
| Benny Rogers | 1 | 9.3 | 1948-1949 | ||
| David Stanley | 1 | 8.7 | 1947-1949 | ||
| John Clontz | 1 | 7.3 | 1949-1949 | ||
| Glenn Dwyer | 1 | 7.3 | 1948-1949 | ||
| Richard Cunningham | 1 | 7.0 | 1949-1949 | ||
| Norman Fitzwater | 1 | 6.0 | 1949-1949 | ||
| Edward Pires | 1 | 4.7 | 1949-1949 | ||
| Harold Timmerman | 1 | 1.7 | 1949-1949 | ||
| Eric Brown | 1 | 27.0 | 1947-1948 | ||
| David Carrero | 1 | 4.7 | 1947-1947 | ||
| Seth McWilliams | 1 | 4.3 | 1947-1947 |
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