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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Aaron Slegers | 3.831 | 2016-2027 | |
| 2 | Jed Bradley | 4.200 | 2016-2024 | |
| 3 | Jose Urena | 4.417 | 2015-2026 | |
| 4 | Barret Loux | 4.521 | 2015-2021 | |
| 5 | Francis Martes | 4.613 | 2019-2027 | |
| 6 | Pete Kelich | 4.627 | 2016-2024 | |
| 7 | Radovan Santrac | 4.664 | 2018-2024 | |
| 8 | Raúl Carrión | 4.708 | 2025-2033 | |
| 9 | Christian Friedrich | 4.904 | 2015-2020 | |
| 10 | Cory Jones | 5.010 | 2015-2025 | |
| 11 | Joe Wieland | 5.032 | 2015-2024 | |
| 12 | Ryan Warner | 5.079 | 2016-2023 |
