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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Ron Cey# | .5694 | 1969 | |
| 2 | Chris Fernandez# | .4877 | 1981 | |
| 3 | Kelly Gruber# | .4004 | 1981 | |
| 4 | Rod Booker# | .3562 | 1981 | |
| 5 | Pete Leppert# | .3306 | 1981 |
