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| Single-Season Losses Leaderboard | |
| * - Indicates Hall of Fame |
| Rank | Player | Losses | IP | Year | Career Leaderboard |
| 1. | Brian Ruffner | 35 | 110.7 | 2017 | |
| 2. | Larry Snow | 33 | 189.3 | 2017 | |
| Victor Martinez | 33 | 157.0 | 2017 | ||
| 4. | Larry Snow | 32 | 178.7 | 2016 | |
| Victor Martinez | 32 | 205.0 | 2010 | ||
| 6. | Bill Cohrs | 29 | 214.7 | 2010 | |
| 7. | Gary Bengtson | 28 | 181.3 | 2021 | |
| Cory Farlow | 28 | 134.7 | 2021 | ||
| Larry Snow | 28 | 173.0 | 2018 | ||
| Willie Guard | 28 | 231.0 | 2016 | ||
| 11. | Rob Huber | 27 | 171.0 | 2022 | |
| Rob Kerr | 27 | 169.7 | 2022 | ||
| Michael Wilson | 27 | 202.3 | 2017 | ||
| Luis Costa | 27 | 238.0 | 2016 | ||
| Willie Iles | 27 | 169.7 | 2015 | ||
| Luis Lees | 27 | 206.0 | 2014 | ||
| Walker King | 27 | 152.7 | 2014 | ||
| Tony Johnstone | 27 | 146.0 | 2014 | ||
| 19. | Harry Otte | 26 | 212.3 | 2014 | |
| Samuel Young | 26 | 235.3 | 2009 | ||
| 21. | Tino Santiago | 25 | 180.3 | 2023 | |
| Gregory Davis | 25 | 203.7 | 2019 | ||
| Pedro Cantu | 25 | 252.7 | 2016 | ||
| Gary Bengtson | 25 | 183.7 | 2016 | ||
| Bubba Reddy | 25 | 147.3 | 2016 | ||
| Victor Martinez | 25 | 121.7 | 2016 | ||
| Earl Mckibben | 25 | 201.0 | 2015 | ||
| Rene Dice | 25 | 153.7 | 2014 | ||
| Joshua Stitt | 25 | 169.7 | 2013 | ||
| John Elks | 25 | 180.7 | 2012 | ||
| Edgardo Moscato | 25 | 132.7 | 2012 | ||
| Danny Galeana | 25 | 201.0 | 2010 | ||
| Kevin Ben | 25 | 182.7 | 2010 | ||
| Kyle Lazo | 25 | 165.0 | 2010 | ||
| 35. | Antone Harvey | 24 | 234.3 | 2019 | |
| Omar Codobes | 24 | 190.7 | 2019 | ||
| Eusebio Viveros | 24 | 106.3 | 2017 | ||
| Jeffrey Sluder | 24 | 141.3 | 2016 | ||
| Justin Hartford | 24 | 200.7 | 2014 | ||
| Alejandro Sanders | 24 | 188.7 | 2014 | ||
| Melvin Saner | 24 | 199.3 | 2013 | ||
| Ira Miller | 24 | 177.3 | 2011 | ||
| 43. | Marlin Karn | 23 | 173.0 | 2024 | |
| Alexander Carreras | 23 | 267.0 | 2023 | ||
| Mark Crocker | 23 | 211.3 | 2022 | ||
| Xabel Sanchez | 23 | 212.3 | 2021 | ||
| Benjamin Feliciano | 23 | 110.0 | 2021 | ||
| Kelvin Caldera | 23 | 227.0 | 2019 | ||
| Mark Saulters | 23 | 183.3 | 2018 | ||
| Bobbie Applegate | 23 | 223.7 | 2016 | ||
| Richard Carnicon | 23 | 181.3 | 2015 | ||
| Michael Ferrell | 23 | 151.3 | 2015 | ||
| Julio Ortiz | 23 | 160.3 | 2014 | ||
| Carl Storch | 23 | 140.3 | 2014 | ||
| Victor Martinez | 23 | 136.0 | 2014 | ||
| Stephen Saiz | 23 | 155.3 | 2013 | ||
| Leo Tucker | 23 | 186.7 | 2012 | ||
| Rags Coulson | 23 | 171.7 | 2012 | ||
| Emmett Parry | 23 | 230.3 | 2011 | ||
| Fernando Contreras | 23 | 199.3 | 2010 | ||
| Jeremy Kellner | 23 | 183.0 | 2003 | ||
| 62. | Albert Morales | 22 | 197.0 | 2024 | |
| Jose Moncada | 22 | 189.7 | 2024 | ||
| Richard Beaudet | 22 | 158.3 | 2024 | ||
| Aaron Perham | 22 | 142.3 | 2023 | ||
| Chris Barefield | 22 | 92.7 | 2023 | ||
| Alexander Carreras | 22 | 263.3 | 2022 | ||
| Luis Barraza | 22 | 210.3 | 2022 | ||
| Geoffrey Matthijse | 22 | 134.3 | 2021 | ||
| Kasey Anderson | 22 | 222.0 | 2019 | ||
| Lewis Michaelson | 22 | 231.0 | 2018 | ||
| Stephen Zeitz | 22 | 176.3 | 2018 | ||
| Eliseo Rosa | 22 | 225.3 | 2017 | ||
| Jack Hughes | 22 | 202.7 | 2017 | ||
| Jay Woodward | 22 | 190.0 | 2017 | ||
| Michael Wilson | 22 | 158.7 | 2016 | ||
| Sergio Drain | 22 | 147.0 | 2016 | ||
| Eliseo Rosa | 22 | 233.0 | 2015 | ||
| Michael Wilson | 22 | 184.7 | 2015 | ||
| Sung Sandler | 22 | 181.3 | 2015 | ||
| Lenard Mckenzie | 22 | 239.7 | 2014 | ||
| Tony Johnstone | 22 | 201.3 | 2013 | ||
| Robert Barnes | 22 | 152.7 | 2013 | ||
| Howard Gutierres | 22 | 218.3 | 2011 | ||
| Victor Martinez | 22 | 214.7 | 2011 | ||
| Chet Brooking | 22 | 215.0 | 2010 | ||
| Douglas Chandler | 22 | 137.3 | 2010 | ||
| 88. | Manuel Ceballos | 21 | 216.0 | 2025 | |
| Richard Brimmer | 21 | 194.7 | 2025 | ||
| Daniel Buerger | 21 | 163.3 | 2025 | ||
| Robert Ferebee | 21 | 249.0 | 2022 | ||
| John Sterling | 21 | 197.3 | 2022 | ||
| Hector Navarro | 21 | 177.7 | 2022 | ||
| Felipe Paredes | 21 | 237.0 | 2020 | ||
| Benjamin Feliciano | 21 | 119.3 | 2020 | ||
| Ben Pavlik | 21 | 106.0 | 2020 | ||
| Stephen Zeitz | 21 | 166.3 | 2019 | ||
| Floyd Fuller | 21 | 124.7 | 2017 | ||
| Lenard Mckenzie | 21 | 237.7 | 2016 | ||
| Bobbie Applegate | 21 | 228.0 | 2015 |
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