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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Casey Kelly# | 1.174 | 2021 | |
| 2 | David Buchanan# | 1.191 | 2021 | |
| 3 | Luis Perdomo# | 1.761 | 2017 | |
| 4 | Julio Teheran | 2.250 | 2013 | |
| 5 | Josh James# | 2.328 | 2020 | |
| 6 | Danny Salazar | 2.746 | 2014 | |
| 7 | Roberto Perez | 3.000 | 2017 | |
| 7 | Carlos Rodon# | 3.000 | 2017 | |
| 9 | Jeremy Hefner | 3.253 | 2013 | |
| 10 | Carlos Rodon# | 3.316 | 2016 | |
| 11 | Jhony Brito# | 3.661 | 2024 | |
| 12 | Alex Meyer | 3.857 | 2014 | |
| 13 | Grayson Long | 4.154 | 2018 | |
| 14 | Ryne Nelson# | 4.500 | 2023 | |
| 15 | Madison Bumgarner | 4.596 | 2013 | |
| 16 | Robbie Erlin# | 4.875 | 2014 | |
| 17 | Anthony DeSclafani# | 5.484 | 2016 | |
| 18 | Austin Pruitt# | 5.500 | 2021 | |
| 19 | Jake Thompson | 5.712 | 2020 | |
| 20 | Miguel A. Gonzalez | 5.786 | 2016 | |
| 21 | Clay Buchholz | 6.557 | 2013 | |
| 22 | Miguel A. Gonzalez | 7.232 | 2014 |
