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| Career Post-Season Losses Leaderboard | |
| * - Indicates Hall of Fame | |
| Bold - Indicates active player |
| Rank | Player | Losses | IP | Last Year | Single Season Leaderboard |
| 1. | Bryce Fiqueroa | 11 | 167.6 | 2019 | |
| 2. | Phillip Thompson | 10 | 102.6 | 2025 | |
| Joel Perrotta | 10 | 152.0 | 2022 | ||
| 4. | Andrew Mclellan | 9 | 153.6 | 2019 | |
| Roderick Pickens * | 9 | 90.3 | 2016 | ||
| 6. | Mario Valdez | 8 | 74.3 | 2022 | |
| Lester Olson * | 8 | 80.6 | 2014 | ||
| Ruben Vasquez | 8 | 56.9 | 2009 | ||
| 9. | Alan Lasater | 7 | 120.0 | 2025 | |
| Antony Roseberry | 7 | 89.3 | 2023 | ||
| Angel Martinez | 7 | 94.0 | 2016 | ||
| Augustus Gerace | 7 | 113.4 | 2012 | ||
| Paul Pastore | 7 | 117.2 | 2011 | ||
| Thomas Read | 7 | 85.4 | 2006 | ||
| 15. | Douglas Morehead | 6 | 208.6 | 2025 | |
| Omar Codobes | 6 | 79.7 | 2025 | ||
| Mike Hessdoerfer | 6 | 78.7 | 2025 | ||
| Giuseppe Gonzalez | 6 | 65.0 | 2025 | ||
| Domingo Caudillo | 6 | 51.3 | 2025 | ||
| William Cull Jr. | 6 | 57.3 | 2024 | ||
| Dennis Aragon | 6 | 45.0 | 2023 | ||
| Albert Morales | 6 | 67.3 | 2022 | ||
| Jose Salinas | 6 | 117.0 | 2021 | ||
| Gregory Arevalo | 6 | 131.6 | 2019 | ||
| Billy Thornton | 6 | 98.0 | 2015 | ||
| Harold Smith | 6 | 99.0 | 2013 | ||
| Keith Kelley | 6 | 88.0 | 2010 | ||
| Mark Flakes | 6 | 93.3 | 2008 | ||
| 29. | Travis Keys | 5 | 86.0 | 2025 | |
| Richard Burford | 5 | 74.3 | 2023 | ||
| Irwin Tan | 5 | 57.3 | 2023 | ||
| Sammie Vansickle | 5 | 75.3 | 2021 | ||
| Tim Dedeaux | 5 | 63.0 | 2021 | ||
| Robert Ferebee | 5 | 160.0 | 2020 | ||
| Isiah Cooper | 5 | 45.0 | 2019 | ||
| Fidel Fierros | 5 | 40.0 | 2019 | ||
| Douglass Edwards | 5 | 75.3 | 2018 | ||
| William Tieman | 5 | 73.6 | 2018 | ||
| Bennie Lopez | 5 | 123.0 | 2016 | ||
| Ben Pavlik | 5 | 56.3 | 2016 | ||
| Brian Fasano | 5 | 47.0 | 2015 | ||
| Jerry Gabaldon | 5 | 77.7 | 2010 | ||
| Kenneth Schrupp | 5 | 135.1 | 2009 | ||
| Mark Smolen * | 5 | 59.6 | 2009 | ||
| Jacob Tomita | 5 | 85.0 | 2007 | ||
| Arden Krueger | 5 | 33.7 | 2006 | ||
| 47. | Larry Miller | 4 | 103.3 | 2025 | |
| Hugh Switzer | 4 | 73.3 | 2025 | ||
| Xabel Sanchez | 4 | 51.0 | 2025 | ||
| Dallas Feingold | 4 | 46.3 | 2025 |
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