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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Shaban Lazami# | .4908 | 1954 | |
| 2 | Miko Soimakallio# | .4785 | 1955 | |
| 3 | Halil Topalli# | .4581 | 1955 | |
| 4 | Vladimir Zupljanin# | .4558 | 1954 | |
| 5 | Dragutin Ckrebic# | .4505 | 1953 | |
| 6 | Milo Bushati# | .4475 | 1955 | |
| 7 | Seth Negen | .4439 | 1952 | |
| 8 | Dragutin Ckrebic# | .4429 | 1954 | |
| 9 | Miko Soimakallio# | .4420 | 1953 | |
| 10 | Jeronym Kubanek# | .4394 | 1953 | |
| 11 | Dragutin Ckrebic# | .4390 | 1955 | |
| 12 | Petar Plavsic# | .4365 | 1953 | |
| 13 | Vladimir Zupljanin# | .4253 | 1955 | |
| 14 | Dragutin Ognenovic# | .4156 | 1952 | |
| 15 | Vinzenz Young | .4149 | 1953 | |
| 16 | Miko Soimakallio# | .4138 | 1954 | |
| 17 | Dragutin Ognenovic# | .3856 | 1955 | |
| 18 | Ed Webster# | .3801 | 1952 | |
| 19 | Izak Necas# | .3778 | 1952 | |
| 20 | Stevan Sainovic# | .3702 | 1954 | |
| 21 | Dragutin Ckrebic# | .3654 | 1952 | |
| 22 | Boris Andjelic# | .3647 | 1953 | |
| 23 | Ognjeslav Popovic# | .3609 | 1954 | |
| 24 | Stevan Sainovic# | .3536 | 1955 | |
| 25 | Miko Soimakallio# | .3498 | 1952 | |
| 26 | Thomas Stevens | .3448 | 1952 | |
| 27 | Vladimir Zupljanin# | .3382 | 1953 |
