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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Cody Reed | 0.540 | 2016 | |
| 2 | Niall Windeler# | 1.200 | 2021 | |
| 2 | Brock Dykxhoorn | 1.200 | 2020 | |
| 4 | Lucas Giolito# | 2.348 | 2014 | |
| 5 | Carlos G. Hernandez | 2.368 | 2020 | |
| 6 | Shane Dawson | 3.057 | 2018 | |
| 7 | Diomenges Almengo# | 3.706 | 2018 | |
| 8 | Adrian Houser# | 4.500 | 2014 | |
| 9 | Chih-Wei Hu | 4.641 | 2014 | |
| 10 | Reid Morgan# | 4.673 | 2020 | |
| 11 | Lucas Giolito# | 5.492 | 2013 |
