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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Willie Stargell# | .5166 | 1961 | |
| 2 | Tom Romano# | .4658 | 1981 | |
| 3 | Amos Otis# | .4500 | 1968 | |
| 4 | Ronald Little# | .4191 | 1981 | |
| 5 | Talmadge Tanks# | .3589 | 1981 | |
| 6 | David Hoyt# | .3075 | 1981 |
