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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Matt Purke | 0.964 | 2015 | |
| 2 | Jose Urena# | 1.612 | 2014 | |
| 3 | Sam Bachman# | 2.298 | 2023 | |
| 4 | Chris Dwyer | 2.328 | 2014 | |
| 5 | Dillon Peters# | 2.348 | 2023 | |
| 6 | Jimmy Gillheeney | 3.098 | 2013 | |
| 7 | James Marvel | 3.375 | 2021 | |
| 8 | Matt Canterino# | 3.436 | 2021 | |
| 9 | Eric Hacker | 3.541 | 2021 | |
| 10 | Branden Kline | 3.600 | 2016 | |
| 11 | Chad Kuhl# | 3.857 | 2024 | |
| 12 | Tyler Rogers# | 4.109 | 2016 | |
| 13 | Conor Harber | 4.200 | 2021 | |
| 14 | Jackson Stephens# | 4.641 | 2015 | |
| 15 | Colin Rodgers | 5.283 | 2015 | |
| 16 | Giovanni Soto | 6.319 | 2014 |
