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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Ryan van der Hoeven# | .5772 | 1925 | |
| 2 | Momsilo Unkovic# | .5626 | 1925 | |
| 3 | André Hubert# | .5467 | 1925 | |
| 4 | Ancel Martin# | .5162 | 1925 | |
| 5 | Stefan Marciniak# | .5154 | 1925 | |
| 6 | Sébastien Guillon# | .4902 | 1925 | |
| 7 | Quentin Thiele# | .4573 | 1925 | |
| 8 | Leonard Albici# | .4374 | 1925 | |
| 9 | Güngör Al-Fanari# | .4373 | 1925 | |
| 10 | Manny Rael# | .4330 | 1925 | |
| 11 | Dietrich Springer# | .4310 | 1925 | |
| 12 | Franz Feiersinger# | .3986 | 1925 |
