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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Kirill Malyusov# | .5249 | 1925 | |
| 2 | Marko Virjonen# | .4612 | 1925 | |
| 3 | Olivier Millot# | .4608 | 1925 | |
| 4 | Witold Siebor# | .4440 | 1925 | |
| 5 | Jeigif Netrebenko# | .4399 | 1925 | |
| 6 | German Holuev# | .4388 | 1925 | |
| 7 | Jarek Kuzela# | .3958 | 1925 | |
| 8 | Igoryok Kakosian# | .3903 | 1925 | |
| 9 | Ross Stone# | .3896 | 1925 | |
| 10 | Wilpert Kroll# | .3790 | 1925 | |
| 11 | Klaus Hoover# | .3768 | 1925 | |
| 12 | Howard Robertson# | .3648 | 1925 | |
| 13 | Manuel Zayas# | .3514 | 1925 |
