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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | EFF | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Víctor Navarro | 1.070 | 1959-1969 | |
| 2 | Leo Worley# | 1.052 | 1985-1988 | |
| 3 | Myung-bak Kim | 1.041 | 1916-1920 | |
| 4 | Rafael Ruíz | 1.038 | 1969-1972 |
