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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Ranger Suarez# | 1.328 | 2018 | |
| 2 | Jacob Nix# | 1.653 | 2016 | |
| 3 | Seamus Barrett# | 2.298 | 2025 | |
| 4 | Konner Wade# | 2.935 | 2023 | |
| 5 | Scott Snodgress | 3.203 | 2014 | |
| 6 | Mitchell Traver | 3.566 | 2019 | |
| 7 | Bobby Wahl | 3.661 | 2015 | |
| 8 | Lincoln Henzman# | 3.938 | 2019 | |
| 9 | Taijuan Walker# | 3.960 | 2013 | |
| 10 | Cameron Gann | 4.021 | 2016 | |
| 11 | Nick Travieso | 4.696 | 2014 | |
| 12 | Matt Swynenberg | 4.714 | 2013 | |
| 13 | Santiago Suarez# | 6.000 | 2025 | |
| 14 | Evan Steele | 8.438 | 2021 |
