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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Tommi Välimäki# | 0.67 | 1932 | |
| 2 | Mixu Petersen# | 0.82 | 1931 | |
| 3 | Tommi Avellan# | 0.83 | 1931 | |
| 4 | Matias Kinnunen# | 0.86 | 1933 | |
| 5 | Tommi Välimäki# | 0.89 | 1931 | |
| 6 | Teddy Yo# | 0.92 | 1932 | |
| 7 | Ezekiel Binda# | 0.98 | 1933 | |
| 8 | Lauri Pohjoispää# | 1.00 | 1931 | |
| 8 | Lauri Pohjoispää# | 1.00 | 1932 | |
| 10 | Nino Marina# | 1.04 | 1931 | |
| 11 | Greger Hassinen# | 1.05 | 1931 | |
| 12 | Greger Hassinen# | 1.06 | 1932 | |
| 13 | Miko Iisalo# | 1.10 | 1932 | |
| 14 | Doąn Dō# | 1.13 | 1933 | |
| 15 | Erik Byrne# | 1.14 | 1932 | |
| 16 | Greger Hassinen# | 1.17 | 1933 | |
| 17 | Kolby Verdier# | 1.23 | 1933 | |
| 18 | Cory Veles# | 1.26 | 1933 | |
| 19 | Settyslas Huttunen# | 1.27 | 1933 | |
| 20 | Mixu Petersen# | 1.33 | 1932 | |
| 21 | Vinny Dominguez# | 1.35 | 1931 | |
| 22 | Zachariah Apoian# | 1.44 | 1933 | |
| 23 | Zachariah Apoian# | 1.55 | 1932 | |
| 24 | Erik Byrne# | 1.56 | 1933 | |
| 25 | Zachary Torres# | 2.07 | 1933 |
