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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Lucas Giolito# | 3.576 | 2013-2015 | |
| 2 | Diomenges Almengo# | 5.283 | 2016-2020 | |
| 3 | Chih-Wei Hu | 6.291 | 2014-2015 |
