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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Tommi Välimäki# | 0.76 | 1931-1933 | |
| 2 | Matias Kinnunen# | 0.86 | 1931-1933 | |
| 3 | Teddy Yo# | 0.92 | 1932-1933 | |
| 4 | Lauri Pohjoispää# | 1.00 | 1931-1933 | |
| 5 | Greger Hassinen# | 1.09 | 1931-1933 | |
| 6 | Doąn Dō# | 1.13 | 1932-1933 | |
| 7 | Mixu Petersen# | 1.15 | 1931-1933 | |
| 8 | Miko Iisalo# | 1.25 | 1931-1933 | |
| 9 | Erik Byrne# | 1.28 | 1932-1933 | |
| 10 | Settyslas Huttunen# | 1.44 | 1931-1933 | |
| 11 | Zachariah Apoian# | 1.49 | 1932-1933 |
