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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Serge Migin# | .5625 | 1953 | |
| 2 | Carmelo Marsuppini# | .5375 | 1954 | |
| 3 | Carmelo Marsuppini# | .5307 | 1955 | |
| 4 | Carmelo Marsuppini# | .5063 | 1953 | |
| 5 | Carmelo Marsuppini# | .4828 | 1952 | |
| 6 | Serge Migin# | .4820 | 1954 | |
| 7 | Salvatorio Tartaglia# | .4792 | 1952 | |
| 8 | Vassily Elihov# | .4735 | 1954 | |
| 9 | Mashiro Oda# | .4672 | 1955 | |
| 10 | Stephen Yeo# | .4370 | 1954 | |
| 11 | Mashiro Oda# | .4312 | 1954 | |
| 12 | Vassily Elihov# | .4124 | 1953 | |
| 13 | Jon Scott# | .4016 | 1952 | |
| 14 | Dusty Cooper# | .3993 | 1952 | |
| 15 | Mashiro Oda# | .3978 | 1952 | |
| 16 | Mashiro Oda# | .3929 | 1953 | |
| 17 | Harry Cook# | .3860 | 1952 | |
| 18 | Sal Mojica# | .3858 | 1953 | |
| 19 | Dusty Cooper# | .3849 | 1953 | |
| 20 | Edwin Vargas# | .3769 | 1954 | |
| 21 | Adam Berger# | .3715 | 1953 | |
| 22 | Adam Berger# | .3664 | 1952 | |
| 23 | Sal Mojica# | .3663 | 1955 | |
| 24 | Nicholas Littmann# | .3574 | 1955 | |
| 25 | Edwin Vargas# | .3215 | 1955 | |
| 26 | Stephen Yeo# | .3185 | 1955 | |
| 27 | Craig Amery# | .3180 | 1953 | |
| 28 | Israhel Brown# | .2857 | 1952 | |
| 29 | Sal Mojica# | .2706 | 1954 |
