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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Branden Kline | 3.938 | 2014-2016 | |
| 2 | Chad Kuhl# | 4.747 | 2023-2025 | |
| 3 | Conor Harber | 4.794 | 2016-2021 | |
| 4 | Eric Hacker | 5.684 | 2017-2022 |
