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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Robert Osborne | 1.742 | 2014-2020 | |
| 2 | Neil Millirons | 2.077 | 2038-2040 | |
| 3 | Scott Banker# | 2.250 | 2054-2057 | |
| 4 | Willi Kehr | 2.389 | 2026-2028 | |
| 5 | Felipe Arreola | 2.411 | 2027-2028 | |
| 6 | Juan Martínez | 3.349 | 2028-2029 | |
| 7 | Blake Mastromarino | 3.545 | 2045-2048 | |
| 8 | Ánibal Altichioro | 3.600 | 2024-2028 | |
| 9 | Jim Shaffner | 3.695 | 2039-2042 | |
| 10 | Jake Robinson | 3.857 | 2017-2024 | |
| 11 | Clay Tedesco# | 4.886 | 2056-2058 | |
| 11 | Victor Vicente# | 4.886 | 2048-2053 |
