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| Single-Season Losses Leaderboard | |
| * - Indicates Hall of Fame |
| Rank | Player | Losses | IP | Year | Career Leaderboard |
| 1. | Tommy Euller | 24 | 240.0 | 1979 | |
| 2. | David Meiners | 22 | 151.0 | 1980 | |
| Francis Szabo | 22 | 268.0 | 1977 | ||
| Albert Ramos | 22 | 228.7 | 1976 | ||
| Bill Lee | 22 | 214.7 | 1976 | ||
| 6. | Phil Longwell | 21 | 200.0 | 1985 | |
| Darius Widowmaker | 21 | 187.0 | 1982 | ||
| Zachary Sumner | 21 | 228.3 | 1979 | ||
| Tommy Euller | 21 | 209.7 | 1977 | ||
| 10. | Jason Jacome | 20 | 174.7 | 1994 | |
| Samuel Smith | 20 | 207.0 | 1990 | ||
| Tom Shelton | 20 | 164.3 | 1983 | ||
| Jackie Varela | 20 | 228.7 | 1981 | ||
| Mark Catron | 20 | 242.3 | 1978 | ||
| Brad Theide | 20 | 215.7 | 1978 | ||
| Burke Eschette | 20 | 287.3 | 1975 | ||
| Burbo Awaradardo | 20 | 206.7 | 1975 | ||
| Burt Grossman | 20 | 237.3 | 1974 | ||
| J.R. Riles | 20 | 207.3 | 1974 | ||
| 20. | John Flaskamper | 19 | 178.7 | 1990 | |
| Allan Bartlett | 19 | 227.3 | 1988 | ||
| Kyle Claiborne | 19 | 230.0 | 1985 | ||
| B.J. Barnaby | 19 | 188.0 | 1982 | ||
| Hector Salazar | 19 | 218.3 | 1980 | ||
| Roland Goodwyn | 19 | 175.3 | 1980 | ||
| Jesus Calabro | 19 | 267.3 | 1979 | ||
| Voo Fowler | 19 | 260.0 | 1979 | ||
| Alvin Harrison | 19 | 169.7 | 1979 | ||
| Robert Chung | 19 | 215.7 | 1978 | ||
| Micheal Cassidy | 19 | 192.3 | 1977 | ||
| Junior Gomez | 19 | 292.0 | 1976 | ||
| Alvin Harrison | 19 | 235.7 | 1976 | ||
| Joseph Porter | 19 | 205.7 | 1976 | ||
| Raz Nugent | 19 | 197.3 | 1975 | ||
| Kal Baron | 19 | 255.7 | 1974 | ||
| Tom Watson | 19 | 206.0 | 1974 | ||
| Mike Madorin | 19 | 222.7 | 1973 | ||
| 38. | Ray Fontenot | 18 | 156.3 | 1994 | |
| Chad Laughlin | 18 | 195.0 | 1992 | ||
| Braggo Franco | 18 | 192.7 | 1992 | ||
| Lee Dedeaux | 18 | 178.3 | 1992 | ||
| Les Straker | 18 | 194.0 | 1990 | ||
| Ryan Dunne * | 18 | 186.7 | 1989 | ||
| Drew Triggs | 18 | 185.0 | 1989 | ||
| Billy Winters | 18 | 220.3 | 1988 | ||
| Pedro Bilbao | 18 | 234.7 | 1987 | ||
| Darius Campbell | 18 | 176.7 | 1987 | ||
| Billy Pena | 18 | 157.3 | 1987 | ||
| Nick Machiavelli | 18 | 138.7 | 1987 | ||
| Mickey Ford | 18 | 235.7 | 1985 | ||
| Stephen Thiel | 18 | 231.0 | 1985 | ||
| Adam Dansereau | 18 | 173.7 | 1981 | ||
| Anthony Ball | 18 | 130.3 | 1981 | ||
| Haystack Duggeler | 18 | 229.3 | 1979 | ||
| Robert Chung | 18 | 160.7 | 1979 | ||
| Christopher Pump | 18 | 231.0 | 1978 | ||
| Gary Nolan | 18 | 178.0 | 1978 | ||
| Mike Madorin | 18 | 264.0 | 1977 | ||
| Jamaal Jumboni | 18 | 257.7 | 1977 | ||
| Cornelius Lattimore | 18 | 222.3 | 1977 | ||
| Eldridge Heim | 18 | 200.3 | 1976 | ||
| Tito Corbin | 18 | 300.3 | 1975 | ||
| Cornelius Clayson | 18 | 214.3 | 1975 | ||
| Tony Salvedo | 18 | 263.7 | 1974 | ||
| 65. | Shane Wookey | 17 | 232.0 | 1994 | |
| Javy Cordero | 17 | 225.7 | 1993 | ||
| Pedro Bilbao | 17 | 196.3 | 1993 | ||
| Randy Tomlin | 17 | 241.0 | 1992 | ||
| Brian Holman | 17 | 156.3 | 1992 | ||
| Guy Dall | 17 | 180.0 | 1990 | ||
| Jose Ramos | 17 | 234.0 | 1989 | ||
| Dennis Martinez | 17 | 180.3 | 1989 | ||
| Billy Pena | 17 | 226.0 | 1988 | ||
| Chuck Rainey | 17 | 187.0 | 1988 | ||
| Rich Meacham | 17 | 195.0 | 1987 | ||
| Kevin Robinson | 17 | 255.0 | 1986 | ||
| Blaine Kinman | 17 | 185.7 | 1986 | ||
| Randy Scarbery | 17 | 195.0 | 1985 | ||
| Floyd Bannister | 17 | 245.0 | 1984 | ||
| Frank Tanana | 17 | 192.3 | 1984 | ||
| John Ross Riles, Jr. | 17 | 182.7 | 1983 | ||
| Cesar Tostado | 17 | 249.0 | 1981 | ||
| Alex Lopez | 17 | 224.3 | 1981 | ||
| Alexander Everett | 17 | 231.3 | 1980 | ||
| Wayne Barney | 17 | 141.3 | 1980 | ||
| Ron Vivero | 17 | 287.3 | 1979 | ||
| Francis Szabo | 17 | 274.3 | 1979 | ||
| Jackie Varela | 17 | 271.0 | 1979 | ||
| Alexander Everett | 17 | 258.7 | 1979 | ||
| James Watkins | 17 | 254.0 | 1979 | ||
| Gustavo Aranda | 17 | 198.3 | 1979 | ||
| Arky Mooris | 17 | 191.0 | 1979 | ||
| Ralphie Wadsner | 17 | 185.3 | 1979 | ||
| Brock Rutherford | 17 | 257.0 | 1978 | ||
| Rudy Ramirez | 17 | 248.0 | 1978 | ||
| Jose Ramos | 17 | 247.0 | 1978 | ||
| Gerardo Caputo | 17 | 209.3 | 1978 | ||
| Christian Perras | 17 | 194.0 | 1978 | ||
| Harvey Vitiello | 17 | 263.7 | 1977 | ||
| Ricky Vaughn | 17 | 201.3 | 1977 |
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