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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Karl Gallizio# | .7917 | 1954 | |
| 2 | Ivico Bogic# | .7586 | 1954 | |
| 3 | Pielgrzym Maslanka# | .7576 | 1954 | |
| 4 | Wessel de Joode# | .6207 | 1954 | |
| 5 | Alexei Yasamanov# | .6071 | 1954 | |
| 6 | Hänsel Braun# | .5909 | 1954 | |
| 7 | Ivan Mandaric# | .5217 | 1954 | |
| 7 | Lance Looij# | .5217 | 1954 | |
| 9 | Noah McMillan# | .5000 | 1954 | |
| 10 | Ognjeslav Milkovic# | .4444 | 1954 | |
| 11 | Hervé Deschamps# | .4412 | 1954 | |
| 12 | Juho Rämö# | .4167 | 1954 | |
| 13 | Hughie Jones# | .3636 | 1954 | |
| 14 | Helge Lobaev# | .3333 | 1954 | |
| 15 | Suljo Misic# | .3077 | 1954 | |
| 16 | Lewis Bowers# | .2381 | 1954 |
