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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | John Keller | 3.560 | 1970-1975 | |
| 2 | Paul Bentall | 3.607 | 1970-1976 | |
| 3 | Artie Walls | 3.869 | 1971-1975 | |
| 4 | Alfredo Velasco | 4.374 | 1970-1976 | |
| 5 | Mac Edmondstone | 4.571 | 1972-1976 | |
| 6 | Warren Walker | 5.145 | 1980-1986 | |
| 7 | Javier Lópes | 5.274 | 1983-1988 | |
| 8 | Dave Smith | 5.384 | 1974-1980 |
