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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Bronisad Kurylo# | .5642 | 1925 | |
| 2 | Obelix Papanicolaou# | .5422 | 1925 | |
| 3 | August Walcher# | .5232 | 1925 | |
| 4 | Bendek Staniewicz# | .5166 | 1925 | |
| 5 | Carlos Quevedo# | .4892 | 1925 | |
| 6 | Carlos Valenzuela# | .4706 | 1925 | |
| 7 | Ronald Connelly# | .4493 | 1926 | |
| 8 | Maurycy Stolarski# | .4473 | 1926 | |
| 9 | Herkko Weilin# | .4418 | 1926 | |
| 10 | Lukas Hoffman# | .4394 | 1925 | |
| 11 | Karel Dvorak# | .4374 | 1925 | |
| 12 | Jovan Bizi# | .3992 | 1926 | |
| 13 | Yermolay Ansov# | .3268 | 1926 |
