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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Matt Walker | 1.191 | 1970-1973 | |
| 2 | Roberto Medina | 1.325 | 1970-1974 | |
| 3 | Carlos Pérez | 1.415 | 1980-1986 | |
| 4 | Juan Garza | 1.428 | 2003-2009 | |
| 5 | Javier Soto | 1.456 | 1970-1976 | |
| 6 | Jorge García | 1.470 | 1970-1974 | |
| 7 | Rich Walters | 1.473 | 1986-1989 | |
| 8 | Luis Rodríguez | 1.527 | 1996-2005 |
