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| Career ERA Leaderboard | |
| * - Indicates Hall of Fame Bold - Indicates active player |
| Rank | Player | ERA | IP | Years | Single Season Leaderboard |
| 1. | Bobby Grimes | 2.132 | 1625.3 | 2009-2014 | |
| 2. | Pedro Ramirez | 2.442 | 1481.6 | 2009-2014 | |
| 3. | James Sousa | 2.672 | 1525.7 | 2009-2014 | |
| 4. | Richard Dicks | 2.784 | 1487.0 | 2009-2014 | |
| 5. | Marcus Dinges | 2.843 | 1234.6 | 2009-2014 | |
| 6. | Walter Lopez | 2.885 | 1076.3 | 2009-2014 | |
| 7. | Robert Carson | 2.986 | 1383.6 | 2009-2014 | |
| 8. | Angel Rodriguez | 3.040 | 1015.3 | 2010-2014 | |
| 9. | James Munguia | 3.095 | 1160.3 | 2009-2014 | |
| 10. | Michael Arnett | 3.155 | 1109.6 | 2009-2014 | |
| 11. | Ryan Stacy | 3.202 | 1206.0 | 2009-2014 | |
| 12. | Joseph Allen | 3.207 | 1176.0 | 2010-2014 | |
| 13. | Bryan Kaplan | 3.331 | 1394.3 | 2009-2014 | |
| 14. | Felix Corchado | 3.338 | 1383.3 | 2009-2014 | |
| 15. | Dennis Hunt | 3.367 | 1382.0 | 2009-2014 | |
| 16. | Felix Murff | 3.396 | 1441.7 | 2009-2014 | |
| 17. | Isogorou Chomei | 3.435 | 1197.3 | 2009-2014 | |
| 18. | Nicholas Lenard | 3.563 | 1242.7 | 2009-2014 | |
| 19. | Miles Farrelly | 3.608 | 1392.0 | 2009-2014 | |
| 20. | Cedric Monasterio | 3.626 | 1099.7 | 2009-2014 | |
| 21. | Bill Hightower | 3.626 | 1402.3 | 2009-2014 | |
| 22. | Harold Garfinkel | 3.632 | 1234.0 | 2009-2014 | |
| 23. | Pedro Cobas | 3.644 | 1178.0 | 2009-2014 | |
| 24. | Andre Morales | 3.648 | 1344.7 | 2009-2014 | |
| 25. | Gerald Orduna | 3.709 | 1380.6 | 2009-2014 | |
| 26. | John McCasland | 3.828 | 1025.0 | 2009-2014 | |
| 27. | Jamie Coop | 3.846 | 1256.7 | 2009-2014 | |
| 28. | Joe Laubach | 3.886 | 1209.0 | 2009-2014 | |
| 29. | Eric Waddington | 3.954 | 1179.0 | 2009-2014 | |
| 30. | Carlos Molina | 3.978 | 1330.3 | 2009-2014 | |
| 31. | Danial Hayes | 4.061 | 1068.3 | 2009-2014 | |
| 32. | George Anderson | 4.111 | 1022.3 | 2009-2014 | |
| 33. | Ronald Koenig | 4.121 | 1124.6 | 2009-2014 | |
| 34. | Michael Munroe | 4.138 | 1089.7 | 2009-2014 | |
| 35. | Kevin Whitford | 4.228 | 1194.3 | 2009-2014 | |
| 36. | Eric Alba | 4.286 | 1031.0 | 2009-2014 | |
| 37. | Rick Varney | 4.292 | 1348.3 | 2009-2014 | |
| 38. | Ramon Medina | 4.315 | 1149.3 | 2009-2014 | |
| 39. | Mario Fung | 4.320 | 1014.7 | 2009-2013 | |
| 40. | Brian Reiter | 4.400 | 1002.3 | 2009-2013 | |
| 41. | Paul Cevallos | 4.454 | 1135.7 | 2009-2014 | |
| 42. | Casey George | 4.459 | 1094.0 | 2009-2014 | |
| 43. | Sam Glisson | 4.487 | 1029.0 | 2009-2014 |
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