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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Chad Durbin | 3.096 | 1999-2008 | |
| 2 | Eric Budo# | 3.483 | 2022-2028 | |
| 3 | Glenn Brown | 3.582 | 2008-2015 | |
| 4 | Todd Manning | 3.587 | 2006-2015 | |
| 5 | António Alonzo | 3.700 | 2010-2023 | |
| 6 | Trevor Foster | 3.728 | 2016-2023 | |
| 7 | Nick Davis | 3.758 | 2006-2015 | |
| 8 | Aurelio Morales# | 3.966 | 2025-2031 | |
| 9 | Lee Ollis# | 3.974 | 2023-2028 | |
| 10 | José Gutiérrez# | 3.979 | 2025-2031 | |
| 11 | Rupert Hunt# | 4.327 | 2026-2031 | |
| 12 | Jong-bum Hong# | 4.788 | 2026-2031 | |
| 13 | Orlando Herrera# | 5.006 | 2025-2030 |
