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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Krisi Grannas# | .6939 | 1931 | |
| 2 | Krisi Grannas# | .6126 | 1932 | |
| 3 | Alonso Nova# | .6039 | 1932 | |
| 4 | Gracjan Derda# | .5307 | 1932 | |
| 5 | Krisi Grannas# | .5216 | 1933 | |
| 6 | Sami Lankinen# | .4863 | 1931 | |
| 7 | Jussi Koiranen# | .4315 | 1933 | |
| 8 | Sami Lankinen# | .4295 | 1932 | |
| 9 | Aatu Auvinen# | .4249 | 1931 | |
| 10 | Sami Lankinen# | .4206 | 1933 | |
| 11 | Alonso Nova# | .4065 | 1931 | |
| 12 | Matias Marimekko# | .3858 | 1932 | |
| 13 | Olle Karsten# | .3377 | 1932 |
