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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Roy Curtin# | 1.761 | 2035 | |
| 2 | Ken Wright# | 2.328 | 2034 | |
| 3 | Curtis Steele# | 2.547 | 2033 | |
| 4 | José Pérez# | 4.765 | 2038 | |
| 5 | José Medellín# | 5.294 | 2030 |
