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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Héctor Aguilar | 2.54 | 2026-2028 | |
| 2 | Pat Thompson | 2.65 | 2020-2022 | |
| 3 | Nicolas Roche# | 2.70 | 2027-2030 | |
| 4 | Reynaldo Sánchez | 2.94 | 2020-2023 | |
| 5 | Lincoln Spooner# | 3.01 | 2026-2028 | |
| 6 | Octávio Ríos# | 3.24 | 2020-2022 | |
| 7 | Edmund Blackadder# | 3.27 | 2026-2030 | |
| 8 | Júlio Díaz# | 3.30 | 2032-2034 | |
| 9 | Will Hoffman# | 3.37 | 2026-2028 | |
| 10 | Bailey Achurch# | 3.39 | 2031-2035 | |
| 11 | Enea Dini | 4.07 | 2020-2024 | |
| 12 | Yoshihide Hirata# | 4.26 | 2030-2034 |
