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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Bret Martin | 3.643 | 1987-1994 | |
| 2 | Miguel Cervantes | 3.662 | 1970-1975 | |
| 3 | Bubba Lynn | 3.755 | 1970-1982 | |
| 4 | Jorge Aragón | 3.839 | 1972-1977 | |
| 5 | Vicente Yzquierdo | 4.034 | 1972-1976 | |
| 6 | Edgardo Suárez | 4.228 | 1977-1981 | |
| 7 | Juan Frías | 4.345 | 1981-1985 | |
| 8 | Roy Thomasson | 4.473 | 1970-1974 | |
| 9 | George Hull | 4.574 | 1978-1981 | |
| 10 | Eduardo Rúbio# | 4.608 | 2010-2015 | |
| 11 | Christian Hamilton | 4.664 | 1970-1977 | |
| 12 | Benjamin McNeil | 4.724 | 1980-1983 | |
| 13 | Denny Wood | 4.938 | 1970-1976 | |
| 14 | Juan Román | 5.068 | 1970-1976 |
