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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Eitan Löbel# | 1.04 | 1953-1959 | |
| 2 | Mounir Soulier# | 1.10 | 1952-1957 | |
| 3 | Hirose Inouye# | 1.11 | 1956-1959 | |
| 4 | Ewan Moore# | 1.24 | 1952-1959 | |
| 5 | John Hahn# | 1.28 | 1952-1958 | |
| 6 | Seon-jong Kim# | 1.29 | 1952-1959 | |
| 7 | Jessy Kok# | 1.38 | 1952-1959 | |
| 8 | Chris Walker# | 1.41 | 1952-1959 | |
| 9 | Aaron Maier# | 1.50 | 1952-1958 | |
| 10 | Alexandre Lefevre# | 1.63 | 1952-1958 | |
| 10 | Ken Roberts# | 1.63 | 1952-1958 | |
| 12 | Adam Scali# | 1.68 | 1953-1959 | |
| 13 | Jim Meagher# | 1.77 | 1954-1959 | |
| 14 | Griff Murphy# | 1.79 | 1952-1959 |
