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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Joe Cleary | 2.162 | 1941-1948 | |
| 2 | Kenneth Kurtz | 2.577 | 1973-1977 | |
| 3 | David Fanning | 2.582 | 1975-1977 | |
| 4 | Jim Officer | 2.594 | 1974-1975 | |
| 5 | Jacinto Camacho | 2.673 | 1963-1967 | |
| 6 | Francis Panick | 2.680 | 1973-1975 | |
| 7 | Robert Ware | 2.800 | 1967-1974 | |
| 8 | Jim Dorsey# | 2.981 | 1975-1979 | |
| 9 | Richard Miller | 3.008 | 1975-1977 | |
| 10 | Marty Bystrom# | 3.043 | 1977-1980 | |
| 11 | Ricky Green | 3.052 | 1973-1978 | |
| 12 | Jim Clancy# | 3.060 | 1974-1975 | |
| 13 | Bob Grossman | 3.068 | 1972-1975 | |
| 14 | Clarence Cooper | 3.069 | 1974-1976 | |
| 15 | Don Stratton | 3.091 | 1971-1977 | |
| 16 | George Rehrer | 3.124 | 1973-1975 | |
| 17 | Ernesto Pirovano | 3.166 | 1975-1976 | |
| 18 | Gary Scavone# | 3.169 | 1975-1977 | |
| 19 | Cecil Reynolds | 3.205 | 1970-1977 | |
| 20 | Jay Howell | 3.216 | 1975-1979 | |
| 21 | Ronald White | 3.268 | 1967-1972 | |
| 22 | Timothy Jones# | 3.348 | 1971-1975 | |
| 23 | Greg Heydeman | 3.371 | 1970-1978 | |
| 24 | John Shermer | 3.376 | 1972-1975 | |
| 25 | Ozzie Esquivel | 3.412 | 1977-1979 | |
| 26 | Ed Ricks | 3.422 | 1971-1974 | |
| 27 | Jeffrey Hooper | 3.427 | 1970-1978 | |
| 28 | Tommie Sheppard | 3.439 | 1970-1973 | |
| 29 | Steve McCaleb | 3.443 | 1973-1976 | |
| 30 | John C Anderson | 3.478 | 1956-1960 | |
| 31 | Lou Bevil | 3.498 | 1940-1949 | |
| 32 | Don Leshnock | 3.515 | 1968-1972 | |
| 33 | Ken Clay | 3.524 | 1972-1975 | |
| 34 | Allen Baker | 3.574 | 1973-1976 | |
| 35 | Vicente Prieto# | 3.592 | 1978-1981 | |
| 36 | Blake Green# | 3.668 | 1970-1972 | |
| 37 | Guillermo Barranca | 3.694 | 1970-1972 | |
| 38 | Elvin Ervin | 3.722 | 1970-1973 | |
| 39 | Larry Elenes | 3.849 | 1971-1978 | |
| 40 | Adrian Mendez | 3.873 | 1976-1979 | |
| 41 | Randall Burkman# | 3.874 | 1978-1981 | |
| 42 | Dennis Miller | 3.946 | 1973-1975 | |
| 43 | Brian Gabriel | 3.992 | 1975-1977 | |
| 44 | Terry Periman | 4.041 | 1971-1972 | |
| 45 | Wade Boyett | 4.093 | 1969-1974 | |
| 46 | Bernie Beckman | 4.176 | 1970-1973 | |
| 47 | Josh Novak | 4.238 | 1973-1975 | |
| 48 | Doug Bair | 4.284 | 1970-1974 | |
| 49 | Cannuci Cuen | 4.381 | 1972-1975 | |
| 50 | John Bevil | 4.400 | 1968-1972 | |
| 51 | Jaime Cocanower# | 4.403 | 1980-1981 | |
| 52 | Luis Machado# | 4.409 | 1977-1981 | |
| 52 | Edward Joyce | 4.409 | 1972-1977 | |
| 54 | Kenneth Watkins | 4.415 | 1970-1975 | |
| 55 | Larry Buckle# | 4.484 | 1977-1981 | |
| 56 | Paul Starkovich | 4.548 | 1971-1975 | |
| 57 | Stephen Cushmore | 4.554 | 1969-1973 | |
| 58 | Steven Holman# | 4.565 | 1978-1981 | |
| 59 | John Walsh | 4.669 | 1971-1973 | |
| 60 | Alfonso Estrada | 4.803 | 1975-1976 | |
| 61 | Keith Halgerson | 4.826 | 1973-1977 | |
| 62 | Bob Kammeyer | 4.953 | 1973-1977 | |
| 63 | Robert Mazur | 5.069 | 1973-1977 | |
| 64 | Bill Kelly# | 5.595 | 1976-1981 | |
| 65 | Jared Neilson | 5.597 | 1972-1975 | |
| 66 | Willie Flores | 5.648 | 1973-1975 |
