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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Harri-Pekka Liimatainen# | .4907 | 1931 | |
| 2 | Noel Räisänen# | .4573 | 1931 | |
| 3 | Toni Egberg# | .4506 | 1933 | |
| 4 | Juho Mallenius# | .4402 | 1931 | |
| 5 | Olafur Thor Ingólfsson# | .4375 | 1932 | |
| 6 | Juho Mallenius# | .4338 | 1932 | |
| 7 | Niki Karvonen# | .4257 | 1931 | |
| 8 | Paolo Macheda# | .4109 | 1933 | |
| 9 | Niki Karvonen# | .4030 | 1932 | |
| 10 | Olafur Thor Ingólfsson# | .3898 | 1933 | |
| 11 | Harri-Pekka Liimatainen# | .3797 | 1932 | |
| 12 | Noel Räisänen# | .3761 | 1932 | |
| 13 | Alpo Talonen# | .3747 | 1931 | |
| 14 | Petrus Kraatari# | .3662 | 1931 | |
| 15 | Harri-Pekka Liimatainen# | .3272 | 1933 |
