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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Cal Quantrill# | 0.931 | 2018 | |
| 2 | Matt Sauer# | 0.947 | 2022 | |
| 3 | Bryce Hubbart# | 1.653 | 2026 | |
| 4 | Casey Bloomquist | 1.688 | 2016 | |
| 5 | Ricky DeVito# | 2.118 | 2022 | |
| 6 | Jesse Beal | 2.328 | 2016 | |
| 6 | Matt Crouse | 2.328 | 2015 | |
| 8 | Josh Prevost | 2.348 | 2017 | |
| 9 | John Stilson | 2.368 | 2013 | |
| 10 | Donn Roach | 2.531 | 2015 | |
| 11 | Charlie Shirek | 2.656 | 2014 | |
| 12 | Shane Watson | 2.945 | 2016 | |
| 13 | Rhett Kouba# | 3.000 | 2026 | |
| 14 | Bryan Hudson# | 3.057 | 2019 | |
| 15 | Griff McGarry# | 3.115 | 2023 | |
| 16 | Paul Demny | 3.259 | 2016 | |
| 17 | Trey Ball | 3.316 | 2016 | |
| 18 | Eury Perez# | 4.154 | 2023 | |
| 19 | Mike Clevinger# | 4.596 | 2015 | |
| 19 | Joe Ross# | 4.596 | 2014 | |
| 21 | Sean Harney# | 4.821 | 2024 | |
| 22 | Luis Ysla | 4.869 | 2015 | |
| 23 | Bryce Bandilla | 5.000 | 2014 | |
| 24 | Anthony Solometo# | 5.294 | 2024 | |
| 25 | Nicholas Tepesch | 5.400 | 2013 | |
| 26 | Dan Reynolds | 5.625 | 2015 | |
| 27 | Zach McCambley# | 6.457 | 2023 | |
| 27 | Jake Wong# | 6.457 | 2021 |
