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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Andre Frye | 3.899 | 1982-1987 | |
| 2 | Carlos Cervantes | 3.956 | 1977-1982 | |
| 3 | José Encarnación | 4.006 | 1984-1991 | |
| 4 | Ken May | 4.225 | 1983-1988 | |
| 5 | Jon Brown | 4.388 | 1976-1980 | |
| 6 | John Allen | 4.667 | 1980-1985 | |
| 7 | Daniel Jefferson | 4.740 | 1977-1983 | |
| 8 | Alfonso De Jesús | 4.956 | 1990-1995 |
