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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Joan Guerrero | 3.016 | 2016-2021 | |
| 2 | Josh Smith | 3.036 | 2016-2022 | |
| 3 | Edward Small# | 3.131 | 2018-2023 | |
| 4 | Colten Brewer | 3.447 | 2016-2021 | |
| 5 | Tim Cates# | 3.512 | 2021-2023 | |
| 5 | Matt Johnson# | 3.512 | 2019-2024 | |
| 7 | Alonso Sánchez# | 3.516 | 2017-2024 | |
| 8 | Scott Alexander# | 3.594 | 2016-2024 | |
| 9 | Jean Carlos Gil | 3.617 | 2014-2019 | |
| 10 | Yohan Flande | 3.746 | 2012-2020 | |
| 11 | Chase Anderson | 3.803 | 2015-2019 | |
| 12 | Konnor Pilkington# | 3.828 | 2019-2023 | |
| 13 | Victor Jones# | 3.855 | 2018-2022 | |
| 14 | Daniel Corcino | 3.921 | 2012-2018 | |
| 15 | Jose Campos# | 3.958 | 2014-2020 | |
| 16 | Bartolo Medina | 3.974 | 2017-2021 | |
| 17 | Daniel Tenholder | 4.069 | 2015-2019 | |
| 18 | Adam Wilk | 4.078 | 2012-2019 | |
| 19 | Brandon Dixon# | 4.152 | 2019-2022 | |
| 20 | Brandon Gomes | 4.167 | 2012-2020 | |
| 21 | Will Smith | 4.264 | 2013-2021 | |
| 22 | Perci Garner | 4.307 | 2012-2021 | |
| 23 | Scott Shuman | 4.336 | 2013-2018 | |
| 24 | Brett Oberholtzer | 4.354 | 2012-2021 | |
| 25 | Wes Martin# | 4.366 | 2018-2023 | |
| 26 | Rafael Morales | 4.381 | 2017-2022 | |
| 27 | Junichi Tazawa | 4.386 | 2012-2019 | |
| 28 | Lino Martinez | 4.395 | 2014-2018 | |
| 29 | Bernalldo Borreco# | 4.438 | 2018-2023 | |
| 30 | Juan Jaime | 4.451 | 2013-2016 | |
| 31 | Jeanmar Gomez | 4.491 | 2012-2021 | |
| 32 | William Cuevas | 4.737 | 2015-2019 | |
| 33 | Anthony Fernandez | 4.846 | 2012-2021 | |
| 34 | Alex Torres | 5.276 | 2012-2017 |
