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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Eb Hartog# | .5767 | 1955 | |
| 2 | Motka Davletkildeev# | .4638 | 1953 | |
| 3 | Eb Hartog# | .4509 | 1954 | |
| 4 | Motka Davletkildeev# | .4400 | 1952 | |
| 5 | Otte van Baardewijk# | .4233 | 1954 | |
| 6 | Otte van Baardewijk# | .3987 | 1955 | |
| 7 | Gene Hills# | .3904 | 1952 |
