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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Brad Gratz | 2.469 | 1972-1974 | |
| 2 | Jose DeLeon# | 2.787 | 1979-1980 | |
| 3 | John Clifton | 3.000 | 1971-1973 | |
| 4 | Erskine Thomason | 3.034 | 1972-1975 | |
| 5 | Jeff McKay | 3.095 | 1972-1977 | |
| 6 | Jerome Scarcella | 3.160 | 1978-1980 | |
| 7 | Odell Jones | 3.211 | 1975-1979 | |
| 8 | Ramon Dominguez# | 3.218 | 1978-1980 | |
| 9 | Dave Downs | 3.270 | 1977-1979 | |
| 10 | Larry Payne | 3.286 | 1972-1977 | |
| 11 | Jody Norris | 3.335 | 1970-1973 | |
| 12 | Dennis Dalton | 3.338 | 1968-1973 | |
| 13 | Jimmy Blackmon | 3.392 | 1968-1974 | |
| 14 | Steve McCatty# | 3.440 | 1973-1976 | |
| 15 | John Hobbs# | 3.517 | 1979-1981 | |
| 16 | Donnie Shields | 3.557 | 1970-1975 | |
| 17 | Bruce Courtmanch | 3.584 | 1970-1976 | |
| 18 | Claudell Anderson | 3.588 | 1971-1979 | |
| 19 | Alan Jackson | 3.620 | 1970-1973 | |
| 20 | Richard Gilman | 3.654 | 1970-1975 | |
| 21 | Glen Landesberg | 3.667 | 1970-1975 | |
| 22 | Eric Wilkins# | 3.676 | 1976-1979 | |
| 23 | Thomas Walsh | 3.733 | 1969-1973 | |
| 24 | Don Aase | 3.757 | 1976-1980 | |
| 25 | Robert Ormond | 3.942 | 1972-1975 | |
| 26 | Tony Perry | 3.991 | 1970-1974 | |
| 27 | Nick Rosado | 4.060 | 1970-1976 | |
| 28 | Mike Zepeda | 4.077 | 1975-1980 | |
| 29 | Michael Pettit | 4.082 | 1970-1975 | |
| 30 | Steve Reed# | 4.085 | 1975-1980 | |
| 31 | Robert Hussey# | 4.102 | 1979-1981 | |
| 32 | Manny Guzman | 4.331 | 1976-1980 | |
| 33 | Bruce Baker | 4.415 | 1977-1981 | |
| 34 | Francisco Nogueira | 4.490 | 1976-1979 | |
| 35 | Willie Sanchez# | 4.567 | 1979-1981 | |
| 36 | Kenneth Fuller | 4.737 | 1970-1975 | |
| 37 | Marco Rojas# | 4.814 | 1976-1981 | |
| 38 | Angel Sanchez | 5.051 | 1978-1980 | |
| 39 | Alfonso Vasquez# | 5.213 | 1979-1981 | |
| 40 | Brian Hayes# | 5.359 | 1978-1981 | |
| 41 | Dave Renderos# | 5.650 | 1977-1980 |
