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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Parker Markel | 1.227 | 2014 | |
| 2 | Kevin McAvoy | 1.653 | 2018 | |
| 3 | Luis Rijo# | 2.700 | 2026 | |
| 4 | Yefry Ramirez | 2.872 | 2017 | |
| 5 | Tanner Peters | 3.048 | 2014 | |
| 6 | Matt Brazis | 3.600 | 2013 | |
| 7 | Miguel Celestino | 4.154 | 2013 | |
| 8 | Andrew Church | 4.596 | 2015 | |
| 9 | Jake Stinnett | 5.283 | 2018 | |
| 10 | Connor Thomas# | 5.304 | 2021 | |
| 11 | Tanner Peters | 5.400 | 2013 | |
| 12 | Jesse Biddle | 5.478 | 2013 |
