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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Bryan Banks | 2.491 | 1998-2002 | |
| 2 | Larry Daig | 2.626 | 2065-2076 | |
| 3 | Craig Walker | 2.762 | 1991-1999 | |
| 4 | Kenny Bradley | 2.829 | 1998-2011 | |
| 5 | Ricardo Díaz | 2.925 | 2000-2010 | |
| 6 | Boyd Burnett | 2.932 | 1997-2001 | |
| 7 | Henry Bader | 2.952 | 1999-2012 | |
| 8 | Chris Hanson | 2.986 | 2003-2011 | |
| 9 | Ernie Christian | 3.002 | 1990-2004 | |
| 10 | Alberto García | 3.041 | 2034-2048 | |
| 11 | Juan Valdéz | 3.073 | 1996-2003 | |
| 12 | James Barry | 3.077 | 2000-2006 | |
| 13 | Micheal Schmidt | 3.078 | 1990-1995 | |
| 14 | Aaron Lawson | 3.086 | 1993-1999 | |
| 15 | Shao-zu An# | 3.092 | 2071-2084 | |
| 16 | Shane Minick | 3.115 | 2066-2079 | |
| 17 | Teodor Reyes | 3.121 | 1999-2008 | |
| 18 | Mushanokoji Kubo | 3.129 | 2049-2064 | |
| 19 | Josh Gesler | 3.135 | 2044-2057 | |
| 20 | Marco Nieves | 3.137 | 2067-2076 | |
| 21 | José Chávez | 3.141 | 1994-2001 | |
| 22 | Ángel Ramírez | 3.142 | 1993-2000 | |
| 23 | Jorge Herrera | 3.157 | 1995-2002 | |
| 24 | Roberto Martinez | 3.168 | 2067-2075 | |
| 25 | Matt Roberts | 3.184 | 2004-2016 | |
| 26 | Dan Burford | 3.203 | 2030-2037 | |
| 27 | Juan Núñez | 3.209 | 1990-1996 | |
| 28 | Vidal Martínez | 3.230 | 2003-2014 | |
| 29 | Jared Small | 3.237 | 2040-2050 | |
| 30 | Sterling Lee | 3.246 | 2003-2011 | |
| 31 | Joel Altamira | 3.263 | 2070-2083 | |
| 32 | Danny Ottamendi | 3.269 | 2053-2061 | |
| 33 | Juan Pérez | 3.284 | 1997-2005 | |
| 34 | Jake Mika | 3.288 | 2065-2078 | |
| 35 | Félix Rodríguez | 3.293 | 1992-2008 | |
| 36 | Fujio Yamashita | 3.309 | 2070-2078 | |
| 37 | Joe Coffman | 3.324 | 2000-2017 | |
| 38 | Victor Pire | 3.326 | 2059-2072 | |
| 39 | Neville Roosemont | 3.339 | 2053-2067 | |
| 40 | Juan Cardenas | 3.355 | 2000-2010 | |
| 41 | Joel Curtis | 3.358 | 1993-2004 | |
| 42 | Vaughn Gibson | 3.360 | 1997-2007 | |
| 42 | Luis Delgado | 3.360 | 2020-2034 | |
| 44 | José De Los Santos | 3.365 | 1990-1995 | |
| 45 | Miguel Vásquez | 3.368 | 2005-2018 | |
| 46 | Hiroshige Uchida | 3.386 | 2000-2018 | |
| 47 | Joe Larson | 3.390 | 2039-2051 | |
| 48 | Fred Lee | 3.392 | 1998-2002 | |
| 49 | Ricardo Tobías | 3.403 | 1997-2002 | |
| 50 | Jason Rogers | 3.412 | 2038-2047 | |
| 51 | John Dixon | 3.430 | 1991-1998 | |
| 52 | Les Saunders | 3.447 | 1990-1998 | |
| 53 | Francisco Marés | 3.453 | 1994-2004 | |
| 54 | Luis Marulnda | 3.454 | 1990-2000 | |
| 55 | Brian Jackson | 3.459 | 2058-2067 | |
| 56 | Santiago Contreras | 3.475 | 1990-1995 | |
| 57 | Mike Freeman | 3.481 | 2056-2071 | |
| 58 | Jared Kozlowski | 3.483 | 2055-2068 | |
| 59 | Sam McFarland | 3.492 | 1991-1999 | |
| 60 | Travis Morris | 3.499 | 2068-2083 | |
| 61 | Andrew Cramer | 3.504 | 2033-2040 | |
| 62 | Duncan Knudson | 3.505 | 2004-2009 | |
| 63 | Pablo Medina# | 3.507 | 2068-2084 | |
| 64 | Seth Slade | 3.515 | 2029-2044 | |
| 65 | Martin Black | 3.518 | 2067-2080 | |
| 66 | Gabriel González | 3.526 | 2007-2018 | |
| 67 | Francisco Martínez | 3.529 | 2045-2054 | |
| 68 | Mike Ashley | 3.530 | 2005-2012 | |
| 69 | Dave Thomas | 3.541 | 2000-2004 | |
| 70 | Gerardo Caraballo | 3.556 | 2035-2051 | |
| 71 | Ernesto Alvarez# | 3.559 | 2071-2082 | |
| 72 | Warner Cavanagh | 3.562 | 2044-2062 | |
| 73 | Ramón Ramírez | 3.564 | 1995-2007 | |
| 73 | Fernando Gomez | 3.564 | 2070-2083 | |
| 75 | Alrigo Occhena | 3.566 | 2046-2056 | |
| 76 | Alberto Ballesteros | 3.568 | 2068-2078 | |
| 77 | Ted Barnett | 3.572 | 1990-1997 | |
| 78 | Claudio Lópes | 3.583 | 1991-2002 | |
| 78 | Carlos Torres# | 3.583 | 2071-2083 | |
| 78 | Aaron Carter | 3.583 | 2011-2021 | |
| 81 | António Alvarado | 3.599 | 1990-1996 | |
| 82 | Dennis Hartman | 3.608 | 2050-2064 | |
| 83 | George Schroeder | 3.615 | 1990-1995 | |
| 84 | Dave Callahan | 3.619 | 2039-2050 | |
| 85 | Arthur Day | 3.631 | 2000-2013 | |
| 86 | Lou Whitehead | 3.632 | 2002-2016 | |
| 87 | Mitsuhiro Nishimura | 3.649 | 2059-2068 | |
| 88 | Rudens Delrosario | 3.659 | 2053-2069 | |
| 89 | Marcos Rodríguez | 3.668 | 2015-2024 | |
| 90 | D'Artagnan Raspberry | 3.669 | 2064-2075 | |
| 91 | Dan Minich | 3.670 | 2067-2078 | |
| 92 | Howard Draper | 3.671 | 1993-1999 | |
| 93 | Yoshinobu Chikafuji | 3.672 | 2047-2057 | |
| 94 | Jose Peguero | 3.681 | 2069-2082 | |
| 95 | Gabriel Arambula | 3.685 | 2056-2065 | |
| 96 | Ossie Lopez | 3.690 | 2068-2080 | |
| 97 | Todd Harper | 3.691 | 1993-2006 | |
| 98 | Franky Santegoeds | 3.695 | 2053-2065 | |
| 99 | Nolan Park | 3.706 | 2029-2038 | |
| 100 | Masaaki Araki | 3.713 | 2058-2068 |
