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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Reino Orava# | .5925 | 1932 | |
| 2 | Urpo Setälä# | .5411 | 1932 | |
| 3 | Juuso Wickström# | .5391 | 1932 | |
| 4 | Juuso Wickström# | .5335 | 1931 | |
| 5 | Reino Orava# | .5066 | 1933 | |
| 6 | Marcus Kirstinä# | .4845 | 1931 | |
| 7 | Reino Orava# | .4829 | 1931 | |
| 8 | Aapo Setälä# | .4753 | 1932 | |
| 9 | Aati Wiberg# | .4489 | 1931 | |
| 10 | Dani Karjalainen# | .4465 | 1931 | |
| 11 | Juuso Wickström# | .4402 | 1933 | |
| 12 | Urpo Setälä# | .4387 | 1931 | |
| 13 | Mohamed Zadi# | .3856 | 1933 | |
| 14 | Kapani Habibi# | .3825 | 1933 | |
| 15 | Thomas Prince# | .3455 | 1933 |
