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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | EFF | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Sergio Sousa# | 1.074 | 1978-1989 | |
| 2 | Lawrence Jenkins# | 1.065 | 1986-1990 | |
| 3 | Rubén Ortíz | 1.051 | 1953-1957 | |
| 4 | Feitze Heijnen | 1.033 | 1934-1939 | |
| 5 | John Wright | 1.019 | 1977-1981 | |
| 6 | Pepe Ledezma | 1.017 | 1919-1923 | |
| 7 | Tim Cox | 0.997 | 1957-1961 | |
| 8 | Paco Chávez | 0.984 | 1912-1916 | |
| 9 | Romeo Brancati | 0.977 | 1960-1965 | |
| 10 | Iván Reynoso | 0.967 | 1945-1947 | |
| 11 | Héctor Mendoza | 0.966 | 1963-1970 | |
| 12 | Jeff Thomas | 0.763 | 1983-1990 |
