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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Bret Martin | 1.255 | 1987-1994 | |
| 2 | Bubba Lynn | 1.269 | 1970-1982 | |
| 3 | Miguel Cervantes | 1.322 | 1970-1975 | |
| 4 | Eduardo Rúbio# | 1.381 | 2010-2015 | |
| 5 | Edgardo Suárez | 1.394 | 1977-1981 | |
| 6 | Roy Thomasson | 1.395 | 1970-1974 | |
| 7 | Vicente Yzquierdo | 1.402 | 1972-1976 | |
| 8 | Juan Frías | 1.411 | 1981-1985 | |
| 9 | Benjamin McNeil | 1.416 | 1980-1983 | |
| 10 | George Hull | 1.420 | 1978-1981 | |
| 11 | Jorge Aragón | 1.425 | 1972-1977 | |
| 12 | Christian Hamilton | 1.431 | 1970-1977 | |
| 13 | Denny Wood | 1.568 | 1970-1976 | |
| 14 | Juan Román | 1.623 | 1970-1976 |
