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| Career Post-Season ERA Leaderboard | |
| * - Indicates Hall of Fame | |
| Bold - Indicates active player |
| Rank | Player | ERA | IP | Last Year | Single Season Leaderboard |
| 1. | Jorge Davila | 0.638 | 42.3 | 2024 | |
| 2. | Michael Toone | 0.687 | 39.3 | 2010 | |
| 3. | Billie Hornung | 0.965 | 28.0 | 2023 | |
| 4. | Michael Duval | 1.033 | 61.0 | 2015 | |
| 5. | Ernest Davis | 1.107 | 40.7 | 2013 | |
| 6. | Paul Osborne | 1.110 | 48.7 | 2011 | |
| 7. | Jason Scott | 1.141 | 23.7 | 2018 | |
| 8. | Lyle Colquitt | 1.385 | 26.0 | 2010 | |
| 9. | Peter Dickey | 1.536 | 70.3 | 2025 | |
| 10. | Edward James | 1.627 | 27.7 | 2025 | |
| 11. | Julio Gillon | 1.659 | 38.0 | 2017 | |
| 12. | Randy Ruiz | 1.669 | 27.0 | 2019 | |
| 13. | Michael Higgins | 1.850 | 48.7 | 2016 | |
| 14. | Samuel Pierce | 1.877 | 24.0 | 2023 | |
| 15. | Henry Cansler | 1.907 | 151.0 | 2007 | |
| 16. | Robert Casanova | 1.915 | 47.0 | 2008 | |
| 17. | Filiberto Guzman | 1.929 | 32.7 | 2025 | |
| 18. | Steven Wren | 1.929 | 42.0 | 2025 | |
| 19. | Justin Nero | 1.943 | 46.3 | 2017 | |
| 20. | Jimmie Slemp | 2.009 | 40.3 | 2019 | |
| 21. | Rey Anderson | 2.047 | 22.0 | 2025 | |
| 22. | Eugene Wrobel | 2.185 | 33.0 | 2012 | |
| 23. | Martin Gainey | 2.253 | 28.0 | 2015 | |
| 24. | Mark Smolen * | 2.265 | 59.6 | 2009 | |
| 25. | Peter Smitherman | 2.267 | 91.3 | 2010 | |
| 26. | Douglas Morehead | 2.286 | 208.6 | 2025 | |
| 27. | James Rhinehart * | 2.303 | 113.3 | 2017 | |
| 28. | Robert Ferebee | 2.307 | 160.0 | 2020 | |
| 29. | Wilfredo Arguelles | 2.316 | 46.6 | 2020 | |
| 30. | Donnie Vanover | 2.334 | 27.0 | 2024 | |
| 31. | James Crose | 2.353 | 30.6 | 2007 | |
| 32. | Lucius Johnston | 2.360 | 68.7 | 2021 | |
| 33. | Don Satchell | 2.369 | 133.0 | 2024 | |
| 34. | Ben Pavlik | 2.397 | 56.3 | 2016 | |
| 35. | Eric Alm | 2.411 | 37.3 | 2024 | |
| 36. | Daniel Pegues | 2.428 | 33.4 | 2012 | |
| 37. | Bob Cowman | 2.490 | 47.0 | 2021 | |
| 38. | Fabian Dipietro | 2.501 | 36.0 | 2013 | |
| 39. | Harold Smith | 2.546 | 99.0 | 2013 | |
| 40. | Richard Papadopoulos | 2.576 | 41.9 | 2012 | |
| 41. | Keith Kaster | 2.671 | 30.3 | 2009 | |
| 42. | Donald Mays | 2.687 | 63.6 | 2013 | |
| 43. | Charles States * | 2.736 | 52.6 | 2020 | |
| 44. | Pete Vanderford | 2.740 | 46.0 | 2012 | |
| 45. | Dustin Birdsall | 2.742 | 68.9 | 2008 | |
| 46. | Alberto Ibarra | 2.760 | 45.7 | 2025 | |
| 47. | Juan Barnes | 2.760 | 45.7 | 2015 | |
| 48. | Danny Featherstone | 2.788 | 61.3 | 2010 | |
| 49. | Marlin Karn | 2.805 | 51.3 | 2015 | |
| 50. | Joel Perrotta | 2.843 | 152.0 | 2022 |
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