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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Kari Marttala# | .4684 | 1931 | |
| 2 | Kari Marttala# | .4360 | 1932 | |
| 3 | Elia Costa# | .4134 | 1933 | |
| 4 | Johannes Nikula# | .4130 | 1933 | |
| 4 | Ville Mikkola# | .4130 | 1932 | |
| 6 | Aalto Kujala# | .4116 | 1932 | |
| 7 | Henrik Granqvist# | .4037 | 1933 | |
| 8 | Ville Mikkola# | .4024 | 1933 | |
| 9 | Urho Paasikivi# | .4012 | 1931 | |
| 10 | Aalto Kujala# | .3925 | 1931 | |
| 11 | Roope Räsänen# | .3852 | 1931 | |
| 12 | Julius Hyrkäs# | .3700 | 1932 | |
| 13 | Kari Marttala# | .3634 | 1933 | |
| 14 | Jørgen Skålevik# | .3442 | 1933 | |
| 15 | Mau Maïfanya# | .2888 | 1933 |
