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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Toni Egberg# | .4352 | 1931 | |
| 2 | Timo Yrjänäinen# | .4277 | 1932 | |
| 3 | Toni Egberg# | .4017 | 1932 | |
| 4 | Timo Yrjänäinen# | .4000 | 1931 | |
| 5 | Håkan Suonperä# | .3846 | 1932 | |
| 6 | Timo Yrjänäinen# | .3813 | 1933 | |
| 7 | William Hon# | .3597 | 1932 | |
| 8 | Jari-Pekka Esselström# | .3528 | 1932 |
