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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Thomas White# | 0.885 | 2025 | |
| 2 | Zach McCambley# | 1.350 | 2024 | |
| 3 | Greg Nappo | 1.473 | 2016 | |
| 4 | Taylor Hearn# | 1.620 | 2020 | |
| 5 | Adam Morgan | 1.761 | 2014 | |
| 6 | Andrew Albers | 1.800 | 2015 | |
| 7 | Christian Binford | 2.038 | 2015 | |
| 8 | Brandon Walter# | 2.250 | 2022 | |
| 9 | Chris Reed | 2.500 | 2014 | |
| 10 | Daniel Lynch# | 2.547 | 2021 | |
| 11 | Franklin Morales | 3.150 | 2014 | |
| 12 | Tyler Chatwood | 3.375 | 2013 | |
| 12 | Will Dion# | 3.375 | 2024 | |
| 14 | Zack Wheeler# | 3.682 | 2013 | |
| 15 | Chris Reed | 3.780 | 2015 | |
| 16 | Spencer Adams | 3.938 | 2017 | |
| 17 | Alec Kisena | 4.075 | 2023 | |
| 18 | Sean Mooney# | 4.200 | 2023 | |
| 18 | Robert Rasmussen | 4.200 | 2016 | |
| 20 | Blake Snell# | 4.500 | 2015 | |
| 21 | Martin Perez# | 4.576 | 2013 | |
| 22 | Aaron Blair | 4.790 | 2016 | |
| 23 | Cody Scarpetta | 4.821 | 2013 | |
| 24 | Chris Murphy# | 6.319 | 2023 | |
| 25 | Ben Yokley | 7.043 | 2016 | |
| 26 | Joel Linares | 7.403 | 2016 | |
| 27 | Ivan Pineyro | 7.875 | 2017 |
