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| Career Losses Leaderboard | |
| * - Indicates Hall of Fame Bold - Indicates active player |
| Rank | Player | Losses | IP | Years | Single Season Leaderboard |
| 1. | Ryan Dunne * | 191 | 3726.6 | 1973-1989 | |
| 2. | Fernando Huertas | 183 | 3950.3 | 1976-1993 | |
| 3. | Michael Mangual * | 172 | 3711.6 | 1975-1991 | |
| 4. | Gerardo Caputo | 166 | 3121.9 | 1974-1990 | |
| 5. | Jose Ramos | 163 | 3214.3 | 1978-1993 | |
| Chuck Schaller | 163 | 3137.9 | 1973-1988 | ||
| 7. | Tenchi Masaki | 161 | 2690.9 | 1977-1993 | |
| Mike Madorin | 161 | 3037.3 | 1973-1985 | ||
| 9. | Lorenzo Diaz | 160 | 3266.6 | 1974-1989 | |
| 10. | Darius Campbell | 157 | 2688.3 | 1977-1991 | |
| 11. | Braggo Franco | 154 | 3375.6 | 1978-1994 | |
| 12. | Olen Eoff | 153 | 2836.3 | 1978-1992 | |
| Ron Vivero | 153 | 2697.0 | 1973-1983 | ||
| 14. | Kevin Robinson | 152 | 2871.0 | 1973-1990 | |
| Ed Ostrosser | 152 | 2400.3 | 1979-1990 | ||
| 16. | Lincoln Hoots | 145 | 2677.6 | 1976-1992 | |
| Bill Max * | 145 | 3376.3 | 1975-1989 | ||
| 18. | Paul Khalil | 143 | 2825.6 | 1977-1992 | |
| 19. | Alex Lopez | 142 | 2767.0 | 1978-1991 | |
| 20. | Zachary Sumner | 141 | 2398.9 | 1973-1983 | |
| 21. | Jackie Varela | 139 | 2448.6 | 1975-1985 | |
| 22. | Darius Widowmaker | 137 | 2188.6 | 1981-1994 | |
| Mark Fidrych | 137 | 2746.3 | 1978-1991 | ||
| 24. | Isidro Guiterrez | 136 | 2714.6 | 1982-1994 | |
| 25. | Bill Walters | 132 | 2567.6 | 1983-1994 | |
| Justin Alexander * | 132 | 3124.3 | 1976-1992 | ||
| 27. | Phil Longwell | 129 | 2163.6 | 1982-1994 | |
| 28. | Bill Microsoft | 128 | 1786.3 | 1983-1994 | |
| Mickey Ford | 128 | 2288.0 | 1976-1986 | ||
| 30. | Pedro Bilbao | 127 | 2112.3 | 1983-1994 | |
| James Watkins | 127 | 2420.3 | 1976-1988 | ||
| 32. | Al Bowsfield | 126 | 2135.0 | 1982-1994 | |
| Claver Olmeda | 126 | 2892.3 | 1982-1993 | ||
| Rodney Lumpkin | 126 | 1807.3 | 1979-1990 | ||
| Frank Rogers | 126 | 2506.3 | 1974-1988 | ||
| 36. | Marcel Reyes | 124 | 2479.3 | 1979-1992 | |
| Francis Szabo | 124 | 2298.3 | 1976-1986 | ||
| Jim McGraw | 124 | 2062.0 | 1973-1984 | ||
| 39. | Denny Wegman | 121 | 2269.0 | 1980-1994 | |
| Rich Meacham | 121 | 1704.6 | 1983-1993 | ||
| 41. | Jerry Syed * | 120 | 3129.3 | 1976-1990 | |
| Larry Trinkle | 120 | 2189.0 | 1976-1989 | ||
| David Lillis | 120 | 2337.9 | 1976-1987 | ||
| 44. | Albert Ramos | 119 | 1782.3 | 1975-1985 | |
| Pete Bucher | 119 | 2229.6 | 1973-1984 | ||
| 46. | Cesar Tostado | 118 | 2043.3 | 1975-1985 | |
| Chuck Delong | 118 | 2391.6 | 1973-1984 | ||
| 48. | Julio Guillerma | 117 | 2613.0 | 1973-1983 | |
| 49. | Blaine Kinman | 116 | 1480.3 | 1983-1992 | |
| Steve Nebraska * | 116 | 4774.3 | 1973-1991 | ||
| Sol Hernandez | 116 | 1914.3 | 1975-1987 | ||
| Larry Gorton | 116 | 1995.3 | 1973-1982 | ||
| 53. | Albert Camarena | 115 | 2009.6 | 1984-1994 | |
| Vernon Meyer | 115 | 2410.6 | 1978-1989 | ||
| Roy Hobbs, Jr. * | 115 | 2738.9 | 1973-1982 | ||
| 56. | Jerry Neal | 113 | 1891.9 | 1980-1993 | |
| Drew Triggs | 113 | 1826.0 | 1980-1991 | ||
| 58. | Hector Salazar | 112 | 2099.6 | 1979-1989 | |
| 59. | Henry Ellis | 111 | 2374.3 | 1983-1994 | |
| Junior Gomez | 111 | 2057.0 | 1973-1982 | ||
| 61. | Washington Jones | 110 | 1761.0 | 1985-1994 | |
| Micheal Cassidy | 110 | 2316.6 | 1977-1988 | ||
| Jacinto Merino | 110 | 1653.6 | 1976-1987 | ||
| Kurt Stallwith * | 110 | 2594.6 | 1973-1984 | ||
| 65. | Floyd Bannister | 109 | 2530.3 | 1983-1994 | |
| Guy Corngood | 109 | 2141.0 | 1984-1994 | ||
| Ray Fontenot | 109 | 2093.6 | 1983-1994 | ||
| Don Gullett | 109 | 1875.6 | 1979-1990 | ||
| Roland Goodwyn | 109 | 1823.0 | 1974-1986 | ||
| 70. | Randy Scarbery | 108 | 1607.6 | 1981-1991 | |
| 71. | John Ross Riles, Jr. | 107 | 3041.3 | 1981-1994 | |
| 72. | Lewis Bauder | 106 | 2298.6 | 1980-1993 | |
| Stephen Thiel | 106 | 1663.6 | 1981-1991 | ||
| Corey Aubrey | 106 | 2613.9 | 1974-1988 | ||
| Gustavo Aranda | 106 | 1605.3 | 1974-1983 | ||
| Anthony Ball | 106 | 1815.3 | 1973-1981 | ||
| 77. | Sam Kirkpatrick | 105 | 2760.6 | 1982-1994 | |
| Hayden Finch | 105 | 2281.6 | 1983-1994 | ||
| Floyd Futon | 105 | 2181.9 | 1982-1994 | ||
| Tommy Euller | 105 | 1368.0 | 1973-1982 | ||
| 81. | Eric Beckmeyer | 104 | 2111.3 | 1979-1992 | |
| Raymond Woodruff | 104 | 1943.3 | 1981-1992 | ||
| Harvey Vitiello | 104 | 1830.0 | 1974-1984 | ||
| 84. | Tex Avery | 103 | 2488.6 | 1981-1993 | |
| 85. | Robert Grove | 102 | 2018.3 | 1984-1994 | |
| 86. | Tim Bombardier | 101 | 2057.3 | 1982-1994 | |
| Dennis Eckersley | 101 | 1767.6 | 1985-1993 | ||
| Mark Catron | 101 | 1487.3 | 1975-1983 | ||
| Marcellus Conley | 101 | 2180.0 | 1973-1981 | ||
| Arky Mooris | 101 | 1829.0 | 1973-1981 | ||
| 91. | Mark Bobovnik * | 100 | 2916.9 | 1979-1992 | |
| Todd Adams | 100 | 2268.0 | 1975-1988 | ||
| 93. | Gunga Oogolagunga | 99 | 1027.6 | 1981-1994 | |
| Adam Dansereau | 99 | 1643.3 | 1979-1992 | ||
| Ace Holder | 99 | 2293.6 | 1973-1982 | ||
| 96. | Avagadro Pompeii | 98 | 1798.3 | 1984-1994 | |
| Eric Van Leemer | 98 | 1794.3 | 1983-1994 | ||
| Matt Ryan | 98 | 2679.3 | 1981-1993 | ||
| 99. | Evander Kilkenny | 97 | 2523.0 | 1983-1994 | |
| Hoyt Perea | 97 | 1568.0 | 1987-1994 |
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