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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Brad Havens# | 2.741 | 1978-1981 | |
| 2 | Dan Schatzeder# | 2.768 | 1976-1979 | |
| 3 | Rick Kreuger | 2.808 | 1970-1975 | |
| 4 | Bucky Jacobs | 2.949 | 1940-1942 | |
| 5 | Lorin Grow | 3.126 | 1974-1979 | |
| 6 | Ramon Mendoza# | 3.143 | 1975-1980 | |
| 7 | Sonny Dixon | 3.183 | 1941-1960 | |
| 8 | Dan Larson# | 3.190 | 1975-1978 | |
| 9 | Nelson Ortiz# | 3.327 | 1973-1979 | |
| 10 | Ted Sadowski | 3.385 | 1956-1966 | |
| 11 | Victor Cruz# | 3.421 | 1976-1981 | |
| 12 | Buddy Schultz | 3.423 | 1972-1977 | |
| 13 | Chuck Nieson | 3.457 | 1963-1969 | |
| 14 | Mark Young# | 3.465 | 1973-1980 | |
| 15 | Warren Bogle | 3.472 | 1968-1974 | |
| 16 | Greg Jaycox | 3.474 | 1970-1974 | |
| 17 | Edward Mims | 3.513 | 1970-1977 | |
| 18 | John Noriega | 3.531 | 1966-1971 | |
| 19 | Dizzy Sutherland | 3.568 | 1949-1951 | |
| 20 | Cisco Carlos | 3.581 | 1964-1966 | |
| 21 | James Brown | 3.589 | 1964-1968 | |
| 22 | Terry Enyart | 3.637 | 1971-1975 | |
| 23 | Moe Burtschy | 3.691 | 1947-1949 | |
| 24 | Tom Hausman# | 3.697 | 1972-1981 | |
| 25 | Frank DeJiulio# | 3.711 | 1977-1981 | |
| 26 | Bill Caudill# | 3.782 | 1975-1980 | |
| 27 | Tyler Barnes | 3.798 | 1975-1978 | |
| 28 | Hal Griggs | 3.822 | 1952-1960 | |
| 29 | Bob Falcon# | 3.902 | 1973-1979 | |
| 30 | Dean Olson | 3.909 | 1978-1979 | |
| 31 | Jim B Manning | 3.920 | 1962-1965 | |
| 32 | Steve Hardin | 3.932 | 1970-1975 | |
| 33 | Tom Johnson | 3.934 | 1971-1975 | |
| 34 | David Harper | 3.941 | 1973-1976 | |
| 35 | Bob L Ferguson | 3.946 | 1941-1948 | |
| 36 | John D'Acquisto | 3.947 | 1972-1976 | |
| 37 | Norm McRae | 4.003 | 1968-1972 | |
| 38 | Dennis Myers | 4.095 | 1970-1975 | |
| 39 | Frank Reyes | 4.162 | 1972-1979 | |
| 40 | Michael Ruddell | 4.194 | 1970-1977 | |
| 41 | Mike LaCoss | 4.261 | 1974-1979 | |
| 42 | Greg Pavlick | 4.290 | 1970-1980 | |
| 43 | Ozzie Osborn | 4.303 | 1972-1974 | |
| 44 | William Bellomo# | 4.363 | 1978-1980 | |
| 45 | Harry Byrd | 4.365 | 1947-1951 | |
| 46 | John Moncier | 4.368 | 1970-1978 | |
| 47 | Joe Nunn | 4.398 | 1971-1973 | |
| 48 | Dennis Lane | 4.400 | 1971-1976 | |
| 49 | Arthur Grassing | 4.412 | 1970-1975 | |
| 50 | Jack Propst | 4.503 | 1970-1974 | |
| 51 | Don Stratton | 4.587 | 1970-1977 | |
| 52 | Jimmy Whisman | 4.718 | 1970-1975 | |
| 53 | Aaron Pina | 4.721 | 1972-1977 | |
| 54 | John Anderson | 4.736 | 1971-1979 | |
| 55 | Jeffrey Hooper | 4.743 | 1971-1978 | |
| 56 | Steve Lawson | 4.880 | 1970-1975 | |
| 57 | Joe W Price# | 4.903 | 1977-1981 | |
| 58 | Tony Cavazos | 5.022 | 1977-1980 | |
| 59 | Elliott Jones | 5.244 | 1970-1975 | |
| 60 | Gregory Kastner# | 5.263 | 1978-1981 |
