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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Andre Frye | 1.352 | 1982-1987 | |
| 2 | Ken May | 1.400 | 1983-1988 | |
| 3 | José Encarnación | 1.415 | 1984-1991 | |
| 4 | Jon Brown | 1.433 | 1976-1980 | |
| 5 | Carlos Cervantes | 1.436 | 1977-1982 | |
| 6 | John Allen | 1.539 | 1980-1985 | |
| 7 | Daniel Jefferson | 1.552 | 1977-1983 | |
| 8 | Alfonso De Jesús | 1.581 | 1990-1995 |
