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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Ezekiel Binda# | 0.551 | 1933 | |
| 2 | Tommi Välimäki# | 0.750 | 1932 | |
| 3 | Greger Hassinen# | 0.831 | 1932 | |
| 4 | Matias Kinnunen# | 0.890 | 1933 | |
| 5 | Mixu Petersen# | 1.091 | 1931 | |
| 6 | Mixu Petersen# | 1.770 | 1932 | |
| 7 | Nino Marina# | 1.957 | 1931 | |
| 8 | Tommi Välimäki# | 2.000 | 1931 | |
| 9 | Erik Byrne# | 2.160 | 1932 | |
| 10 | Teddy Yo# | 2.189 | 1932 | |
| 11 | Greger Hassinen# | 2.374 | 1931 | |
| 12 | Settyslas Huttunen# | 2.700 | 1933 | |
| 13 | Tommi Avellan# | 2.739 | 1931 | |
| 14 | Greger Hassinen# | 2.953 | 1933 | |
| 15 | Lauri Pohjoispää# | 3.000 | 1931 | |
| 15 | Doąn Dō# | 3.000 | 1933 | |
| 17 | Miko Iisalo# | 3.057 | 1932 | |
| 18 | Cory Veles# | 3.068 | 1933 | |
| 19 | Vinny Dominguez# | 3.130 | 1931 | |
| 20 | Zachariah Apoian# | 3.699 | 1933 | |
| 21 | Erik Byrne# | 3.938 | 1933 | |
| 22 | Kolby Verdier# | 3.989 | 1933 | |
| 23 | Lauri Pohjoispää# | 4.200 | 1932 | |
| 24 | Zachariah Apoian# | 4.950 | 1932 | |
| 25 | Zachary Torres# | 7.800 | 1933 |
