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| Career Losses Leaderboard | |
| * - Indicates Hall of Fame Bold - Indicates active player |
| Rank | Player | Losses | IP | Years | Single Season Leaderboard |
| 1. | James Leggett | 64 | 917.7 | 1952-1955 | |
| 2. | Juan Daggett | 63 | 896.6 | 1952-1955 | |
| 3. | Joshua Stephens | 61 | 1043.7 | 1952-1955 | |
| 4. | Matt Freeborn | 59 | 877.0 | 1952-1955 | |
| Steven Caesar | 59 | 862.3 | 1952-1955 | ||
| 6. | Fabian Cordova | 57 | 1094.7 | 1952-1955 | |
| Cameron Hagans | 57 | 1086.0 | 1952-1955 | ||
| 8. | Billy Delucia | 55 | 1004.7 | 1952-1955 | |
| Antonio Padula | 55 | 967.3 | 1952-1955 | ||
| Bill Pelfrey | 55 | 934.7 | 1952-1955 | ||
| 11. | Ruben Ibarra | 52 | 960.0 | 1952-1955 | |
| 12. | Alexander Lenihan | 51 | 975.3 | 1952-1955 | |
| Osvaldo Valtierra | 51 | 970.6 | 1952-1955 | ||
| Winfred Converse | 51 | 922.7 | 1952-1955 | ||
| 15. | Bruce Carlson | 50 | 1133.3 | 1952-1955 | |
| Gary Wadsworth | 50 | 934.7 | 1952-1955 | ||
| 17. | Michael Knepper | 49 | 1246.3 | 1952-1955 | |
| Robert Stadler | 49 | 1086.3 | 1952-1955 | ||
| Eduardo Garza | 49 | 865.7 | 1953-1955 | ||
| 20. | Francis Wachter | 48 | 1087.6 | 1952-1955 | |
| 21. | Jack Hitchcock | 47 | 1015.0 | 1952-1955 | |
| 22. | Walter Meas | 46 | 976.3 | 1952-1955 | |
| Richard Bush | 46 | 965.7 | 1952-1955 | ||
| 24. | Gerald Adkisson | 45 | 1051.0 | 1952-1955 | |
| Harry Frink | 45 | 1004.3 | 1952-1955 | ||
| Michael Donnelly | 45 | 706.0 | 1952-1955 | ||
| 27. | Carl Nicosia | 44 | 1061.3 | 1952-1955 | |
| John Alton | 44 | 1040.0 | 1952-1955 | ||
| 29. | Tracy Dodson | 43 | 788.3 | 1952-1955 | |
| Christopher Leatherwood | 43 | 764.7 | 1952-1955 | ||
| 31. | Donald Phillips | 42 | 1139.6 | 1952-1955 | |
| Kasey Cook | 42 | 866.7 | 1952-1955 | ||
| 33. | Harry Robin | 41 | 1082.3 | 1952-1955 | |
| Michael Jackson | 41 | 865.0 | 1952-1955 | ||
| David Stilwell | 41 | 793.0 | 1952-1955 | ||
| Michael Sturges | 41 | 915.3 | 1952-1954 | ||
| 37. | Dante Ruiz | 39 | 1195.3 | 1952-1955 | |
| Jason Williams | 39 | 1006.7 | 1952-1955 | ||
| Guillermo Rios | 39 | 696.6 | 1952-1955 | ||
| Everett Colletti | 39 | 652.7 | 1952-1955 | ||
| Richard Sanders | 39 | 601.3 | 1952-1955 | ||
| 42. | William Holley | 38 | 826.3 | 1952-1955 | |
| John Kelley | 38 | 749.7 | 1952-1955 | ||
| 44. | Nathaniel McInerney | 37 | 661.0 | 1952-1955 | |
| 45. | George Bash | 36 | 639.0 | 1952-1955 | |
| Michael Naron | 36 | 636.7 | 1952-1955 | ||
| Vincent Vivian | 36 | 623.3 | 1952-1955 | ||
| James Kimbrough | 36 | 566.3 | 1952-1955 | ||
| Jermaine Jensen | 36 | 368.3 | 1952-1955 | ||
| Brain Emmer | 36 | 494.7 | 1953-1954 | ||
| 51. | Clyde Pearson | 35 | 1053.0 | 1952-1955 | |
| George Gumm | 35 | 690.0 | 1952-1955 | ||
| Alejo Torralbo | 35 | 621.0 | 1952-1955 | ||
| Larry Bagby | 35 | 555.0 | 1952-1955 | ||
| 55. | Alexis Aguiar | 34 | 734.7 | 1953-1955 | |
| Pat Ogren | 34 | 708.3 | 1952-1955 | ||
| Melvin Antonio | 34 | 604.3 | 1952-1955 | ||
| 58. | Justin Paige | 33 | 836.6 | 1952-1955 | |
| Isaias Jimenez | 33 | 750.7 | 1953-1955 | ||
| George Ogren | 33 | 647.0 | 1952-1955 | ||
| Roy Waites | 33 | 455.3 | 1952-1954 | ||
| Wilber Gullett | 33 | 401.0 | 1952-1954 | ||
| Frank Haws | 33 | 365.7 | 1952-1953 | ||
| 64. | Gordon Nuttall | 32 | 547.3 | 1952-1955 | |
| Earle Roberts | 32 | 542.7 | 1952-1955 | ||
| Adrian Latta | 32 | 512.0 | 1952-1955 | ||
| Danny Simmons | 32 | 483.3 | 1952-1955 | ||
| Earl Griffin | 32 | 369.3 | 1953-1954 | ||
| 69. | Victor Bell | 31 | 637.3 | 1952-1955 | |
| Kevin Clingerman | 31 | 561.0 | 1953-1955 | ||
| Harry Pettitt | 31 | 524.7 | 1952-1955 | ||
| Bryan Crossett | 31 | 464.7 | 1952-1955 | ||
| Theo Pettry | 31 | 592.7 | 1952-1954 | ||
| 74. | John Toomer | 30 | 427.3 | 1952-1955 | |
| Rodney Bond | 30 | 538.0 | 1952-1954 | ||
| Todd Barlowe | 30 | 350.3 | 1952-1954 | ||
| 77. | Austin Deel | 29 | 609.7 | 1953-1955 | |
| 78. | Tony Delossantos | 28 | 667.3 | 1952-1955 | |
| Frank Delmonte | 28 | 489.7 | 1952-1955 | ||
| Alex Sainz | 28 | 403.0 | 1952-1955 | ||
| Andrew Muller | 28 | 528.0 | 1952-1953 | ||
| 82. | Raymond Curry | 27 | 487.0 | 1952-1955 | |
| 83. | David Caviness | 26 | 535.6 | 1952-1955 | |
| Thomas Crystal | 26 | 485.0 | 1952-1955 | ||
| Stephen Gilbert | 26 | 386.3 | 1952-1954 | ||
| 86. | Timothy Silk | 25 | 445.0 | 1952-1955 | |
| Salomon Mejorado | 25 | 404.3 | 1954-1955 | ||
| Micheal Albaugh | 25 | 354.3 | 1952-1955 | ||
| Nathaniel Richardson | 25 | 359.3 | 1952-1954 | ||
| 90. | Christian Schwandt | 24 | 489.3 | 1953-1955 | |
| Charles Royston | 24 | 419.3 | 1953-1955 | ||
| James Johnson | 24 | 406.0 | 1953-1955 | ||
| 93. | Donald Matte | 23 | 300.3 | 1952-1954 | |
| 94. | Leo Perez | 22 | 454.3 | 1952-1955 | |
| Rene Muņoz | 22 | 432.3 | 1953-1955 | ||
| Christopher Funke | 22 | 400.3 | 1952-1955 | ||
| Clemente Vilas | 22 | 391.0 | 1953-1955 | ||
| Abraham Costillo | 22 | 368.6 | 1952-1955 | ||
| Clyde Kangas | 22 | 368.0 | 1952-1955 | ||
| Donald Grant | 22 | 348.7 | 1952-1955 |
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