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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Ewan Moore# | 2.368 | 1952 | |
| 2 | Mounir Soulier# | 3.375 | 1953 | |
| 3 | Aaron Maier# | 3.706 | 1952 | |
| 4 | Mounir Soulier# | 3.780 | 1952 | |
| 5 | Omar Cespedes# | 3.971 | 1953 | |
| 6 | Danny Arellano# | 4.091 | 1953 | |
| 7 | Aaron Maier# | 4.154 | 1953 |
