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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | EFF | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Dylan Parret | 1.081 | 1914-1918 | |
| 2 | Kyle Blackburn# | 1.030 | 1983-1989 | |
| 3 | Tatsuzo Fujii | 1.010 | 1968-1973 | |
| 4 | Aloísio Villoldo | 0.974 | 1956-1960 | |
| 5 | Brendan Reinhold | 0.906 | 1934-1938 | |
| 6 | Arturo Carrillo | 0.867 | 1981-1990 | |
| 7 | Joe Lester | 0.859 | 1975-1981 |
