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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Eb Hartog# | .5767 | 1955 | |
| 2 | Otte van Baardewijk# | .5258 | 1956 | |
| 3 | Finn Haarhuis# | .5131 | 1956 | |
| 4 | Haruyoshi Chikasuye# | .4912 | 1956 | |
| 5 | Zach Warren# | .4908 | 1958 | |
| 6 | Motka Davletkildeev# | .4638 | 1953 | |
| 7 | Eb Hartog# | .4509 | 1954 | |
| 8 | Motka Davletkildeev# | .4400 | 1952 | |
| 9 | Otte van Baardewijk# | .4233 | 1954 | |
| 10 | Juan Montemayor# | .4231 | 1957 | |
| 11 | Bret Haskell# | .4178 | 1957 | |
| 12 | Eb Hartog# | .4129 | 1957 | |
| 13 | Otte van Baardewijk# | .3987 | 1955 | |
| 14 | Gene Hills | .3904 | 1952 | |
| 15 | Jose Zubiate# | .3734 | 1957 | |
| 16 | Al Briones# | .3168 | 1958 |
