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| Career Post-Season Losses Leaderboard | |
| * - Indicates Hall of Fame Bold - Indicates active player |
| Rank | Player | Losses | IP | Years | Single Season Leaderboard |
| 1. | Chad Schmidt | 13 | 224.0 | 2016-2029 | |
| 2. | David Echegaray | 11 | 213.3 | 2004-2023 | |
| Ben Lamela | 11 | 263.0 | 2009-2022 | ||
| 4. | Jonathan Alexander | 10 | 161.3 | 2021-2029 | |
| Carlos Horizon | 10 | 85.3 | 2021-2029 | ||
| Artur Sax | 10 | 116.3 | 2016-2020 | ||
| Leo Cleland * | 10 | 246.3 | 2006-2014 | ||
| Robert Garza * | 10 | 180.3 | 2006-2014 | ||
| 9. | Ramon Cordova | 9 | 168.6 | 2017-2029 | |
| Todd Neary | 9 | 131.0 | 2021-2029 | ||
| Skip Burns | 9 | 115.3 | 2010-2019 | ||
| 12. | David Bonneau | 8 | 127.3 | 2024-2029 | |
| Blitz Codd | 8 | 98.3 | 2023-2029 | ||
| Ryan Turner * | 8 | 288.0 | 2002-2021 | ||
| Abraham Grayston | 8 | 105.7 | 2009-2019 | ||
| Clarence McNatt * | 8 | 245.3 | 2003-2017 | ||
| Dennis Morelock * | 8 | 124.0 | 2003-2013 | ||
| Aaron Bacon * | 8 | 113.6 | 2000-2011 | ||
| Armando Quinonez * | 8 | 101.7 | 2001-2006 | ||
| 20. | Ralph Ives | 7 | 269.7 | 2019-2029 | |
| Charles Lewandowski | 7 | 158.3 | 2019-2029 | ||
| Richard San Juan | 7 | 73.0 | 2021-2029 | ||
| Manuel Nieves | 7 | 161.6 | 2021-2028 | ||
| Benny Suarez | 7 | 130.7 | 2017-2028 | ||
| Chale Crespa | 7 | 111.6 | 2021-2028 | ||
| Mark Trowers | 7 | 70.0 | 2017-2025 | ||
| Alex Ramirez | 7 | 89.3 | 2004-2014 | ||
| Joseph Smartt | 7 | 169.6 | 2002-2012 | ||
| Joseph Bingman | 7 | 99.0 | 2003-2012 | ||
| Alfonso Arevalo | 7 | 62.6 | 2001-2010 | ||
| 31. | Christopher Millar | 6 | 90.0 | 2017-2029 | |
| Jacob Perl | 6 | 88.0 | 2017-2029 | ||
| Manuel De La Cruz | 6 | 44.0 | 2023-2029 | ||
| Powell Hoffman | 6 | 77.3 | 2023-2028 | ||
| Humberto Deleon | 6 | 90.7 | 2014-2026 | ||
| Danny Day | 6 | 160.7 | 2016-2022 | ||
| Carmine Whittingham | 6 | 81.0 | 2016-2022 | ||
| Linwood Judy | 6 | 48.3 | 2004-2016 | ||
| Leonard Lubbers | 6 | 143.6 | 2003-2012 | ||
| James Yim * | 6 | 124.0 | 2005-2012 | ||
| Jeeves Vanhooten | 6 | 62.7 | 2000-2012 | ||
| Armand Banuelos | 6 | 139.3 | 2000-2011 | ||
| Malik Meng | 6 | 69.6 | 2000-2007 | ||
| 44. | Roderigo Pequero | 5 | 102.7 | 2023-2029 | |
| Benicio Andaverde | 5 | 96.3 | 2018-2029 | ||
| Herbert Castillo | 5 | 59.3 | 2027-2029 | ||
| Tyler Lattimore | 5 | 53.3 | 2019-2029 | ||
| Dallas Lesley | 5 | 37.6 | 2021-2029 | ||
| Ed Cook | 5 | 45.6 | 2021-2028 | ||
| Darius Wells | 5 | 52.0 | 2021-2027 |
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