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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Júlio Caraballo | 0.771 | 2030-2034 | |
| 2 | Luis Leyva | 1.766 | 2013-2019 | |
| 3 | Will Lester | 2.113 | 2021-2023 | |
| 4 | Bubba McCall# | 2.400 | 2046-2051 | |
| 5 | Dave Boyer# | 2.551 | 2043-2051 | |
| 6 | Toby Adams | 2.686 | 2034-2047 | |
| 7 | Michael Calhoun | 2.908 | 2044-2049 | |
| 8 | Takeichi Koike | 3.079 | 2017-2020 | |
| 9 | Jarred Benson | 3.757 | 2038-2043 | |
| 10 | Bill Davis | 4.400 | 2030-2037 | |
| 11 | Rory Taverner | 4.686 | 2023-2025 |
