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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Mike Foltynewicz# | 3.77 | 2026-2028 | |
| 2 | Pat Hunt | 3.78 | 2017-2029 | |
| 3 | Juan Pérez | 3.84 | 2017-2023 | |
| 4 | César González | 3.97 | 2020-2029 | |
| 5 | Carlos Hernández | 4.39 | 2021-2028 | |
| 6 | Lance de Valk# | 4.57 | 2025-2030 | |
| 7 | Ben Logan# | 4.74 | 2019-2023 | |
| 8 | Paco Hernández | 4.94 | 2021-2027 |
