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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Eric Hacker | 3.323 | 2017-2022 | |
| 2 | Logan Darnell | 4.771 | 2013-2024 | |
| 3 | Mark Leiter Jr.# | 5.307 | 2015-2021 | |
| 4 | Jordan Guerrero# | 5.432 | 2017-2025 |
