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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Ewan Moore# | 3.247 | 1952-1955 | |
| 2 | Mounir Soulier# | 3.514 | 1952-1955 | |
| 3 | Adam Scali# | 3.892 | 1953-1955 | |
| 4 | Ken Roberts# | 3.946 | 1952-1955 | |
| 5 | Aaron Maier# | 4.336 | 1952-1955 | |
| 6 | Chris Walker# | 4.469 | 1952-1955 | |
| 7 | Jim Meagher# | 5.235 | 1954-1955 |
