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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Eitan Löbel# | 1.137 | 1953-1959 | |
| 2 | Hirose Inouye# | 2.007 | 1956-1959 | |
| 3 | Ewan Moore# | 2.716 | 1952-1959 | |
| 4 | Mounir Soulier# | 3.393 | 1952-1957 | |
| 5 | Jessy Kok# | 3.468 | 1952-1959 | |
| 6 | Adam Scali# | 3.825 | 1953-1959 | |
| 7 | Ken Roberts# | 4.204 | 1952-1958 | |
| 8 | Seon-jong Kim# | 4.422 | 1952-1959 | |
| 9 | John Hahn# | 4.500 | 1952-1958 | |
| 10 | Aaron Maier# | 4.754 | 1952-1958 | |
| 11 | Chris Walker# | 4.774 | 1952-1959 | |
| 12 | Alexandre Lefevre# | 5.211 | 1952-1958 | |
| 13 | Jim Meagher# | 5.308 | 1954-1959 | |
| 14 | Griff Murphy# | 5.804 | 1952-1959 |
