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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Manuel Hernández | 3.110 | 1970-1976 | |
| 2 | Miguel Varela | 3.703 | 1993-1998 | |
| 3 | Brandon Moody | 4.071 | 1976-1981 | |
| 4 | Johnny Hudson | 4.498 | 1972-1977 | |
| 5 | Eugene Payton | 4.551 | 1973-1977 | |
| 6 | Juan Jose Colón | 4.613 | 1970-1976 | |
| 7 | Arturo Herrera | 4.635 | 1972-1977 | |
| 8 | Luis Pérez | 4.794 | 1983-1988 | |
| 9 | Andrew Norman | 4.833 | 1979-1983 | |
| 10 | Ken Burris | 5.037 | 1983-1987 | |
| 11 | Jeremy Ludwick | 5.184 | 1976-1979 | |
| 12 | James McConnell | 5.893 | 1984-1988 |
