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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Tommy Boggs# | 2.664 | 1973-1975 | |
| 2 | Scott Budner# | 2.731 | 1976-1979 | |
| 3 | Cliff Speck | 2.754 | 1974-1977 | |
| 4 | Gustavo Santiago# | 2.808 | 1977-1980 | |
| 5 | Woody Rich | 2.891 | 1950-1956 | |
| 6 | Daniel Solters | 2.913 | 1970-1976 | |
| 7 | John Brown# | 2.941 | 1971-1975 | |
| 8 | Frank Kenyon | 3.021 | 1973-1978 | |
| 9 | Marcelino Dominguez | 3.061 | 1966-1969 | |
| 10 | Steve Waterbury | 3.065 | 1970-1972 | |
| 11 | Tony Barrientos | 3.067 | 1970-1973 | |
| 12 | Brooks Carey# | 3.071 | 1978-1980 | |
| 13 | Glen Tackitt# | 3.087 | 1971-1975 | |
| 14 | Jeff Wehmeier | 3.107 | 1974-1979 | |
| 15 | David Selinsky | 3.133 | 1976-1979 | |
| 16 | Bill Harrington | 3.150 | 1950-1961 | |
| 17 | Danny Guevara | 3.181 | 1974-1978 | |
| 18 | Len Matarazzo | 3.214 | 1951-1953 | |
| 19 | Luis Cardenas# | 3.252 | 1977-1980 | |
| 20 | Les Straker# | 3.297 | 1977-1981 | |
| 21 | Silvio Martinez# | 3.366 | 1974-1976 | |
| 22 | Rick Kemp | 3.372 | 1970-1975 | |
| 23 | Pete Peckham | 3.419 | 1970-1975 | |
| 24 | Jim Sadowski | 3.423 | 1972-1974 | |
| 25 | Malcolm Warren | 3.470 | 1958-1967 | |
| 26 | Thomas McWilliams# | 3.475 | 1977-1981 | |
| 27 | Casey Cox | 3.485 | 1962-1964 | |
| 28 | David Harper | 3.512 | 1971-1973 | |
| 29 | Roger Hayward | 3.529 | 1965-1971 | |
| 30 | Robert Ware | 3.532 | 1968-1972 | |
| 31 | James Harris | 3.545 | 1970-1975 | |
| 32 | Brent Bush | 3.547 | 1973-1976 | |
| 33 | Craig Scramuzzo | 3.574 | 1970-1972 | |
| 34 | Wally Wolf | 3.578 | 1962-1966 | |
| 35 | Edward Szado | 3.589 | 1970-1972 | |
| 36 | Ted Abernathy | 3.600 | 1947-1949 | |
| 37 | Franklin Martinez | 3.651 | 1972-1974 | |
| 38 | Robert Moran | 3.665 | 1972-1974 | |
| 39 | Robert Love | 3.695 | 1970-1973 | |
| 40 | Dave Pagan | 3.699 | 1970-1972 | |
| 41 | Jesse Jepsen | 3.719 | 1973-1975 | |
| 42 | Brad Gratz | 3.765 | 1970-1971 | |
| 43 | Kevin Richards# | 3.817 | 1977-1981 | |
| 44 | John Travis | 3.823 | 1971-1973 | |
| 45 | William Davidson | 3.912 | 1970-1974 | |
| 46 | Bruce Olson | 3.925 | 1969-1974 | |
| 47 | Carlos Martinez# | 3.975 | 1972-1973 | |
| 48 | Don Aase | 3.976 | 1972-1975 | |
| 49 | Butch Edge | 4.042 | 1974-1977 | |
| 50 | Steven Fair | 4.051 | 1971-1976 | |
| 51 | Coley Smith | 4.080 | 1970-1976 | |
| 52 | Alex Vasquez# | 4.082 | 1973-1975 | |
| 53 | Terry Bongiovanni | 4.153 | 1970-1973 | |
| 54 | Robin Fuson# | 4.195 | 1978-1981 | |
| 55 | Wilson Rainer | 4.209 | 1970-1973 | |
| 56 | Melvin Lopez | 4.231 | 1974-1979 | |
| 57 | Gabriel Rams | 4.337 | 1973-1975 | |
| 58 | Paul Givens# | 4.419 | 1977-1981 | |
| 59 | Sam Atnip | 4.421 | 1973-1975 | |
| 60 | Federico Rapalo# | 4.451 | 1977-1981 | |
| 61 | Ricky Avelar# | 4.689 | 1977-1981 | |
| 62 | Jack Glover | 5.031 | 1971-1973 | |
| 63 | Erik Hendricks# | 5.044 | 1978-1981 | |
| 64 | Kenneth Waiss | 5.283 | 1970-1978 |
