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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Toni Similä# | .5390 | 1932 | |
| 2 | Toni Similä# | .5283 | 1931 | |
| 3 | Trevor Horelica# | .5047 | 1933 | |
| 4 | Tommy Karlsson# | .4915 | 1931 | |
| 5 | Toni Similä# | .4861 | 1933 | |
| 6 | Sigurd Nilsson# | .4766 | 1932 | |
| 7 | Reko Häyrynen# | .4755 | 1933 | |
| 8 | Ilmo Hakanen# | .4545 | 1931 | |
| 9 | Sigurd Nilsson# | .4406 | 1933 | |
| 10 | Sigurd Nilsson# | .4353 | 1931 | |
| 11 | Ilmo Hakanen# | .4283 | 1932 | |
| 12 | Tommy Karlsson# | .4191 | 1932 | |
| 13 | Dave Vega# | .4087 | 1933 | |
| 14 | Tommy Karlsson# | .3755 | 1933 | |
| 15 | Oskari Eklund# | .3733 | 1931 | |
| 16 | Jussi Koiranen# | .3424 | 1931 | |
| 17 | Jussi Koiranen# | .3403 | 1932 | |
| 18 | Charles Agyiri# | .3392 | 1931 | |
| 19 | Terjo Kallio# | .3114 | 1932 |
