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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | EFF | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | José Rosales | 1.022 | 1955-1960 | |
| 2 | Brian Powell | 1.017 | 1984-1989 | |
| 3 | Pablo Fernández | 1.011 | 1957-1960 | |
| 4 | Hart Phillips# | 0.996 | 1976-1980 | |
| 5 | Ramón Jiménez | 0.931 | 1961-1965 |
