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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. | Dante Ruiz | 6 | 55.7 | 1952-1954 | |
| 2. | Fabian Cordova | 5 | 78.3 | 1952-1955 | |
| 3. | Michael Sturges | 4 | 54.0 | 1952-1954 | |
| Pat Ogren | 4 | 21.3 | 1953-1953 | ||
| 5. | Carl Nicosia | 3 | 84.3 | 1952-1955 | |
| Antonio Padula | 3 | 38.3 | 1952-1953 | ||
| 7. | Donald Phillips | 2 | 73.0 | 1954-1955 | |
| Eduardo Garza | 2 | 19.7 | 1955-1955 | ||
| Christian Schwandt | 2 | 9.3 | 1955-1955 | ||
| Michael Knepper | 2 | 14.0 | 1954-1954 | ||
| Kevin Lint | 2 | 8.7 | 1952-1954 | ||
| Edward Manos | 2 | 8.7 | 1953-1954 | ||
| Jason Williams | 2 | 63.7 | 1952-1953 | ||
| Cameron Hagans | 2 | 35.0 | 1953-1953 | ||
| Dennis Christian | 2 | 23.7 | 1953-1953 | ||
| Isaias Jimenez | 2 | 15.0 | 1953-1953 | ||
| Ryan Rossi | 2 | 8.0 | 1952-1953 | ||
| 18. | Michael Jackson | 1 | 19.3 | 1955-1955 | |
| Bud Pulaski | 1 | 17.0 | 1955-1955 | ||
| Enrique Martinez | 1 | 11.7 | 1954-1955 | ||
| Christopher Leatherwood | 1 | 9.0 | 1955-1955 | ||
| Robert Stadler | 1 | 8.0 | 1955-1955 | ||
| Hai Orona | 1 | 3.3 | 1955-1955 | ||
| Kenneth Lozoya | 1 | 2.0 | 1955-1955 | ||
| Harry Robin | 1 | 58.3 | 1953-1954 | ||
| David Caviness | 1 | 29.7 | 1953-1954 | ||
| Tony Delossantos | 1 | 26.7 | 1952-1954 | ||
| Winfred Converse | 1 | 23.0 | 1952-1954 | ||
| Bruce Carlson | 1 | 17.3 | 1954-1954 | ||
| Juan Coen | 1 | 9.0 | 1952-1954 | ||
| Steven Caesar | 1 | 5.3 | 1954-1954 | ||
| Jay Tyrrell | 1 | 4.0 | 1954-1954 | ||
| Mathew Nail | 1 | 2.0 | 1954-1954 | ||
| Gary Wadsworth | 1 | 5.7 | 1953-1953 | ||
| Earl Hilliard | 1 | 4.0 | 1952-1953 | ||
| Francis Wachter | 1 | 27.0 | 1952-1952 | ||
| Alexander Lenihan | 1 | 8.7 | 1952-1952 |
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