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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Nils Korkia-aho# | .4368 | 1933 | |
| 2 | Esa Haverinen# | .4275 | 1933 | |
| 3 | William Hon# | .4238 | 1933 | |
| 4 | Håkan Suonperä# | .4226 | 1931 | |
| 5 | Nils Korkia-aho# | .4221 | 1932 | |
| 6 | Yago Figueiredo# | .3722 | 1933 | |
| 7 | Jimi Ali# | .3674 | 1931 |
