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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | John Keller | 1.253 | 1970-1975 | |
| 2 | Paul Bentall | 1.353 | 1970-1976 | |
| 3 | Artie Walls | 1.368 | 1971-1975 | |
| 4 | Alfredo Velasco | 1.463 | 1970-1976 | |
| 5 | Warren Walker | 1.525 | 1980-1986 | |
| 6 | Mac Edmondstone | 1.526 | 1972-1976 | |
| 7 | Javier Lópes | 1.624 | 1983-1988 | |
| 8 | Dave Smith | 1.629 | 1974-1980 |
