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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Ben Crabb# | 0.88 | 2026-2032 | |
| 2 | Don Wheeler# | 1.73 | 2029-2032 | |
| 3 | Robert Osborne | 1.74 | 2014-2020 | |
| 4 | Benny Hartley# | 2.14 | 2022-2022 | |
| 5 | Willi Kehr# | 2.39 | 2026-2028 | |
| 6 | Felipe Arreola# | 2.41 | 2027-2028 | |
| 7 | Matsuyo Koda# | 3.05 | 2026-2029 | |
| 8 | Juan Martínez# | 3.35 | 2028-2029 | |
| 9 | George Clay | 3.45 | 2013-2020 | |
| 10 | Ánibal Altichioro# | 3.60 | 2024-2028 | |
| 11 | Jake Robinson | 3.86 | 2017-2024 | |
| 12 | Jeff Stephens# | 4.04 | 2028-2032 | |
| 13 | Luis Olvera | 4.20 | 2018-2020 |
