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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Alin Oanta | 3.61 | 2020-2027 | |
| 2 | Augusto Ramos# | 3.83 | 2026-2033 | |
| 3 | Seong-rae Park# | 4.18 | 2026-2034 | |
| 4 | Bob Browning# | 5.52 | 2027-2034 | |
| 5 | Luis Cuero# | 5.71 | 2024-2033 |
