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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Toni Similä# | .5179 | 1931-1933 | |
| 2 | Trevor Horelica# | .5106 | 1932-1933 | |
| 3 | Sigurd Nilsson# | .4508 | 1931-1933 | |
| 4 | Ilmo Hakanen# | .4428 | 1931-1933 | |
| 5 | Hiski Hänninen# | .4358 | 1931-1932 | |
| 6 | Reko Häyrynen# | .4345 | 1931-1933 | |
| 7 | Tommy Karlsson# | .4285 | 1931-1933 | |
| 8 | Dave Vega# | .4087 | 1932-1933 | |
| 9 | Daniel Veteläinen# | .4041 | 1931-1933 | |
| 10 | Oskari Eklund# | .3907 | 1931-1933 | |
| 11 | Ernie Santizo# | .3470 | 1932-1933 | |
| 12 | Jussi Koiranen# | .3414 | 1931-1933 | |
| 13 | Charles Agyiri# | .3284 | 1931-1932 | |
| 14 | Terjo Kallio# | .3283 | 1931-1933 |
