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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Al Oliver# | .5053 | 1968 | |
| 2 | Jordan Ayala# | .4087 | 1981 | |
| 3 | German Rivera# | .3879 | 1981 | |
| 4 | George Kaage# | .3483 | 1981 | |
| 5 | Steven Mobberley# | .3140 | 1981 |
