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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Raul Ortiz# | 2.391 | 1979-1980 | |
| 2 | Ken McBride | 2.529 | 1954-1954 | |
| 3 | Jim Parke# | 2.953 | 1978-1981 | |
| 4 | Jim Brosnan | 3.039 | 1947-1947 | |
| 5 | Bob J Bowman | 3.040 | 1946-1950 | |
| 6 | Ken Kirchner | 3.063 | 1971-1979 | |
| 7 | James Owen | 3.161 | 1973-1975 | |
| 8 | Thomas DeJak | 3.202 | 1977-1979 | |
| 9 | Red Marion | 3.368 | 1940-1941 | |
| 10 | Allan Ramirez# | 3.397 | 1978-1979 | |
| 11 | Bob Borkowski | 3.462 | 1946-1946 | |
| 12 | Scott Anderson | 3.473 | 1976-1980 | |
| 13 | Miguel Morales# | 3.516 | 1978-1979 | |
| 14 | Gary Blaylock | 3.537 | 1950-1951 | |
| 15 | Howie Nunn | 3.581 | 1954-1955 | |
| 16 | Gerald Stutzriem# | 3.603 | 1977-1981 | |
| 17 | Perry Cliburn# | 3.649 | 1980-1981 | |
| 18 | Timothy Waclawczyk | 3.664 | 1974-1980 | |
| 18 | Paul LaPalme | 3.664 | 1941-1946 | |
| 20 | Javier Cruc# | 3.685 | 1978-1980 | |
| 21 | Ricky Mayo | 3.769 | 1976-1979 | |
| 22 | Danny Dalonzo | 3.921 | 1969-1972 | |
| 23 | Israel Monroy | 4.058 | 1972-1976 | |
| 24 | Jimmy Briggs | 4.124 | 1972-1975 | |
| 25 | Armando Roche | 4.143 | 1944-1946 | |
| 26 | James Nickerson | 4.154 | 1975-1979 | |
| 27 | Bobby Solis | 4.223 | 1973-1976 | |
| 28 | Ray Semproch | 4.245 | 1951-1951 | |
| 29 | Mike Kume | 4.369 | 1948-1949 | |
| 30 | Ivan Vasquez# | 4.423 | 1979-1981 | |
| 31 | Woody Wheaton | 4.469 | 1948-1950 | |
| 32 | Jeff Wehmeier | 4.491 | 1970-1976 | |
| 33 | Hal Woodeshick | 4.542 | 1952-1952 | |
| 34 | Justin Davidson | 4.560 | 1970-1975 | |
| 35 | Brian Gabriel | 4.605 | 1971-1976 | |
| 36 | Danny Umana | 4.881 | 1977-1979 | |
| 37 | Danny Hinchman | 4.989 | 1971-1976 | |
| 38 | Greg Waldron | 5.400 | 1971-1974 | |
| 39 | Tim Lane | 5.530 | 1970-1975 | |
| 40 | Luis Cuadrado# | 5.571 | 1977-1980 | |
| 41 | Scott Rains | 5.666 | 1972-1975 | |
| 42 | Marco Sarabia# | 6.017 | 1971-1974 | |
| 43 | Michael Gustave | 8.961 | 1975-1977 |
