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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Matias Kinnunen# | 0.890 | 1931-1933 | |
| 2 | Tommi Välimäki# | 1.286 | 1931-1933 | |
| 3 | Greger Hassinen# | 2.086 | 1931-1933 | |
| 4 | Teddy Yo# | 2.189 | 1932-1933 | |
| 5 | Mixu Petersen# | 2.382 | 1931-1933 | |
| 6 | Erik Byrne# | 2.736 | 1932-1933 | |
| 7 | Doąn Dō# | 3.000 | 1932-1933 | |
| 8 | Lauri Pohjoispää# | 3.500 | 1931-1933 | |
| 9 | Settyslas Huttunen# | 3.767 | 1931-1933 | |
| 10 | Zachariah Apoian# | 4.263 | 1932-1933 | |
| 11 | Miko Iisalo# | 4.468 | 1931-1933 |
