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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Bobby Bonds# | .5837 | 1965 | |
| 2 | Ramiro Gutierrez# | .5086 | 1981 | |
| 3 | Pat Dumouchelle# | .4390 | 1981 | |
| 4 | Robert Duran# | .4344 | 1981 |
