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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Larry LeJeune | 3.080 | 1970-1975 | |
| 2 | Bobby Day | 3.933 | 1973-1976 | |
| 3 | Trevor Bailey | 4.224 | 1977-1983 | |
| 4 | Joseph Rogers | 4.595 | 1982-1988 | |
| 5 | Matt Johnson | 4.815 | 1973-1979 | |
| 6 | Jesús Rodríguez | 5.432 | 1985-1991 | |
| 7 | Reginald Neal | 5.474 | 1975-1980 |
