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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Kwang-hyun Kim# | 2.596 | 2023-2025 | |
| 2 | Luke Weaver# | 3.079 | 2017-2024 | |
| 3 | Brent Honeywell Jr.# | 4.829 | 2018-2020 | |
| 4 | Paolo Espino# | 5.651 | 2016-2025 |
