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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Matt Walker | 2.971 | 1970-1973 | |
| 2 | Roberto Medina | 3.785 | 1970-1974 | |
| 3 | Javier Soto | 4.185 | 1970-1976 | |
| 4 | Carlos Pérez | 4.255 | 1980-1986 | |
| 5 | Jorge García | 4.426 | 1970-1974 | |
| 6 | Luis Rodríguez | 4.482 | 1996-2005 | |
| 7 | Juan Garza | 4.871 | 2003-2009 | |
| 8 | Rich Walters | 5.041 | 1986-1989 |
