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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Javier Pérez | 0.429 | 2033 | |
| 2 | Orlando Peña | 0.600 | 2029 | |
| 3 | Reginald Clay# | 0.794 | 2042 | |
| 4 | Walt McCarthy# | 0.931 | 2038 | |
| 5 | Lance O'Donel# | 1.125 | 2048 | |
| 6 | José Hernández# | 1.328 | 2042 | |
| 7 | Walter Lambert# | 1.558 | 2047 | |
| 8 | Clint Beck# | 1.620 | 2043 | |
| 9 | Sergio Rivera | 1.653 | 2035 | |
| 10 | Paul Weber# | 1.929 | 2043 | |
| 11 | Paulino Guerrero | 2.077 | 2033 | |
| 12 | Tyler Hanna# | 2.143 | 2042 | |
| 13 | José Ríos# | 2.348 | 2047 | |
| 14 | Carlton Collins# | 2.400 | 2042 | |
| 14 | Javier Rodríguez# | 2.400 | 2042 | |
| 16 | Ken Clark# | 2.411 | 2041 | |
| 17 | Wilbur Fullerton# | 2.647 | 2046 | |
| 18 | Iván Lerma | 2.700 | 2030 | |
| 18 | Robin Owens | 2.700 | 2030 | |
| 20 | Terry Hoffman | 2.739 | 2031 | |
| 21 | Jesús Velásquez# | 3.000 | 2042 | |
| 22 | Robby Page# | 3.130 | 2041 | |
| 23 | Edmund Richardson | 3.500 | 2037 | |
| 24 | Luis López# | 3.712 | 2041 | |
| 25 | Dave Lee# | 3.789 | 2042 | |
| 26 | Drew Payne# | 3.904 | 2041 | |
| 27 | Tim Howitt# | 3.938 | 2041 | |
| 28 | Kevin Jenkins | 4.000 | 2040 | |
| 29 | Stephen Warner# | 4.109 | 2042 | |
| 29 | George King# | 4.109 | 2047 | |
| 31 | Bill Cunningham# | 4.154 | 2047 | |
| 32 | Joe Manley | 4.263 | 2036 | |
| 33 | Armando Pérez# | 4.667 | 2043 | |
| 34 | Henry Davis# | 4.696 | 2044 | |
| 35 | Shannon McClerey | 4.800 | 2033 | |
| 36 | William Garza# | 4.860 | 2044 | |
| 37 | Jeff Dwyer# | 4.909 | 2041 | |
| 38 | Iván Costa# | 5.192 | 2043 | |
| 39 | Arturo Castillo# | 5.400 | 2044 | |
| 40 | Skip Márquez# | 5.604 | 2044 | |
| 41 | Dan Ness# | 6.319 | 2043 | |
| 42 | José Marte# | 8.237 | 2043 | |
| 43 | John Howard# | 9.000 | 2044 | |
| 44 | Merlin Peterson# | 10.340 | 2044 |
