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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Jason Hursh | 2.118 | 2015 | |
| 2 | Chris Martin# | 2.348 | 2016 | |
| 3 | Brandon Birdsell# | 2.531 | 2026 | |
| 4 | Kyle Crick# | 2.872 | 2016 | |
| 5 | Reiss Knehr# | 2.935 | 2026 | |
| 6 | Reiver Sanmartin# | 3.375 | 2026 | |
| 7 | Jordan Yamamoto# | 3.500 | 2021 | |
| 8 | Blake Treinen# | 4.200 | 2015 | |
| 9 | Anthony Veneziano# | 4.408 | 2026 | |
| 10 | Luis Rodriguez# | 4.500 | 2026 | |
| 11 | Jameson Taillon# | 4.641 | 2013 | |
| 12 | Luis Ortiz# | 5.062 | 2018 | |
| 13 | Barret Loux | 5.108 | 2015 | |
| 14 | Andre Jackson# | 5.170 | 2023 | |
| 15 | Percy Garner | 5.400 | 2014 | |
| 16 | Donn Roach | 5.473 | 2014 | |
| 17 | Nathan Wiles# | 5.492 | 2023 | |
| 18 | Jean Pinto# | 6.319 | 2024 | |
| 19 | Misael Siverio | 6.600 | 2016 | |
| 20 | Tanner Burns# | 6.750 | 2024 | |
| 21 | Eric Berger | 8.345 | 2014 | |
| 22 | Sean Nolin | 9.180 | 2013 |
