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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 | Alexei Yasamanov# | .6857 | 1957 | |
| 5 | Lance Looij# | .6486 | 1957 | |
| 6 | Jonathan Gautier# | .6296 | 1957 | |
| 7 | Grisha Galenkovsky# | .6207 | 1957 | |
| 7 | Wessel de Joode# | .6207 | 1954 | |
| 9 | Alexei Yasamanov# | .6071 | 1954 | |
| 10 | Hänsel Braun | .5909 | 1954 | |
| 11 | Pielgrzym Maslanka# | .5556 | 1957 | |
| 12 | Ivan Mandaric# | .5217 | 1954 | |
| 12 | Lance Looij# | .5217 | 1954 | |
| 14 | Ivan Mandaric# | .5200 | 1957 | |
| 15 | Roger Walter# | .5000 | 1957 | |
| 15 | Noah McMillan# | .5000 | 1954 | |
| 17 | Lewis Bowers# | .4483 | 1957 | |
| 18 | Ognjeslav Milkovic | .4444 | 1954 | |
| 18 | Milo Bushati# | .4444 | 1957 | |
| 20 | Hervé Deschamps# | .4412 | 1954 | |
| 21 | Juho Rämö# | .4167 | 1954 | |
| 22 | Paul Morin# | .4000 | 1957 | |
| 23 | Juho Rämö# | .3750 | 1957 | |
| 24 | Hughie Jones# | .3636 | 1954 | |
| 25 | Helge Lobaev# | .3333 | 1954 | |
| 26 | Suljo Misic# | .3182 | 1957 | |
| 27 | Suljo Misic# | .3077 | 1954 | |
| 28 | Lewis Bowers# | .2381 | 1954 | |
| 29 | Noah McMillan# | .2222 | 1957 | |
| 30 | Sreten Djorovic# | .2000 | 1957 | |
| 31 | Karl Gallizio# | .1818 | 1957 |
