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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Manuel Hernández | 1.188 | 1970-1976 | |
| 2 | Miguel Varela | 1.323 | 1993-1998 | |
| 3 | Luis Pérez | 1.403 | 1983-1988 | |
| 4 | Brandon Moody | 1.439 | 1976-1981 | |
| 5 | Johnny Hudson | 1.455 | 1972-1977 | |
| 6 | Arturo Herrera | 1.470 | 1972-1977 | |
| 7 | Eugene Payton | 1.488 | 1973-1977 | |
| 8 | Juan Jose Colón | 1.519 | 1970-1976 | |
| 9 | Ken Burris | 1.537 | 1983-1987 | |
| 10 | Andrew Norman | 1.572 | 1979-1983 | |
| 11 | Jeremy Ludwick | 1.612 | 1976-1979 | |
| 12 | James McConnell | 1.695 | 1984-1988 |
