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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Jim Wynn# | .4450 | 1962 | |
| 2 | Gene Roof# | .4155 | 1981 | |
| 3 | Cliff Pastornicky# | .3854 | 1981 | |
| 4 | Brad Wellman# | .3491 | 1981 | |
| 5 | Miguel Dominguez# | .3217 | 1981 | |
| 6 | Steve McAllister# | .3106 | 1981 | |
| 7 | Takashi Upshur# | .2900 | 1981 | |
| 8 | Melvin Freeman# | .2824 | 1981 |
