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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Joseph Heywood | 1.247 | 1999 | |
| 2 | Pat Hughes | 1.263 | 2000 | |
| 3 | Jerry Jones | 1.435 | 1996 | |
| 4 | Enrique Escues | 1.471 | 2001 | |
| 5 | Tom Schmidt | 1.496 | 2001 | |
| 6 | Jeff Matthews | 1.539 | 1998 | |
| 7 | David Wise | 1.544 | 2004 | |
| 8 | José Féliz | 1.597 | 2024 | |
| 9 | Denny Gonzales | 1.612 | 2000 | |
| 10 | Pedro Sánchez | 1.617 | 1998 | |
| 11 | Jake Ens | 1.619 | 2001 | |
| 12 | Lawrence Ryman | 1.621 | 1996 | |
| 13 | Bob Wood | 1.632 | 1999 | |
| 14 | Josh Oliver | 1.643 | 2000 | |
| 15 | Carl MacNeill | 1.659 | 2004 | |
| 16 | Satoshi Shirai# | 1.719 | 2054 | |
| 17 | Sabir Askeri | 1.755 | 2049 | |
| 18 | Elvin Willard | 1.766 | 2008 | |
| 19 | Buford Kessinger | 1.775 | 1999 | |
| 20 | Jason Hurt | 1.779 | 2052 | |
| 21 | Jeremy Taylor | 1.788 | 1996 | |
| 22 | Herman Mitchell | 1.800 | 1996 | |
| 23 | Matèa Dosti | 1.808 | 2056 | |
| 24 | José Rivera# | 1.812 | 2058 | |
| 25 | Sinclair Kooijman | 1.840 | 2014 | |
| 25 | Jack Sellers | 1.840 | 2006 | |
| 27 | Harry Walker# | 1.841 | 2062 | |
| 28 | Rafael Vázquez | 1.842 | 1999 | |
| 29 | Juan Vado | 1.850 | 2049 | |
| 30 | Mack Milholm | 1.852 | 2000 | |
| 31 | José Cervantes | 1.864 | 2013 | |
| 32 | Dave Hebert | 1.866 | 2054 | |
| 33 | Rafael Vázquez | 1.870 | 1997 | |
| 34 | Hernando Pérez | 1.873 | 2000 | |
| 35 | Motuha Kalinda# | 1.885 | 2051 | |
| 36 | Jed Flores | 1.891 | 2053 | |
| 37 | Gonzalo Ruíz# | 1.895 | 2053 | |
| 38 | Pete Ervin | 1.914 | 2017 | |
| 39 | José Acuña# | 1.936 | 2059 | |
| 40 | Kevin Nelson | 1.938 | 2011 | |
| 40 | John Robinson | 1.938 | 2001 | |
| 42 | Domenic Blondell | 1.941 | 2041 | |
| 43 | Freddie McCormick | 1.957 | 2009 | |
| 44 | Bob Chambers | 1.963 | 2012 | |
| 45 | Richard Cleveland | 1.966 | 2001 | |
| 46 | Leroy Warner | 1.970 | 1999 | |
| 47 | Curtis Bhatia | 1.978 | 1997 | |
| 48 | Tony Bernard | 1.986 | 2054 | |
| 49 | José Santiago# | 1.989 | 2062 | |
| 50 | Matt Desmarais | 1.991 | 2002 | |
| 51 | Juan Gonzalez | 2.005 | 2000 | |
| 52 | Bill Littrell | 2.011 | 1999 | |
| 53 | Lawrence Forest# | 2.013 | 2060 | |
| 54 | José Martínez | 2.014 | 2007 | |
| 55 | Iván Deleón | 2.016 | 2025 | |
| 56 | Juan Luna | 2.018 | 2002 | |
| 56 | Curtis Bhatia | 2.018 | 1998 | |
| 58 | Oscar Whitehead | 2.019 | 2003 | |
| 59 | Marty Greene | 2.025 | 2000 | |
| 59 | Sinclair Kooijman | 2.025 | 2015 | |
| 61 | Juan Lucero | 2.027 | 2016 | |
| 61 | Julián Ayala | 2.027 | 2025 | |
| 63 | Jani Forsbacka | 2.033 | 2037 | |
| 64 | Alonso Chávez | 2.036 | 2049 | |
| 65 | Carlos Granados | 2.040 | 2047 | |
| 66 | Ignacio Lewis# | 2.042 | 2060 | |
| 67 | Rodrigo Gallegos | 2.043 | 2038 | |
| 68 | Ralph Leslie | 2.047 | 2000 | |
| 69 | Joe D'antonio | 2.050 | 2049 | |
| 70 | Pat Welshman | 2.060 | 2002 | |
| 71 | Gabriel Cabrera | 2.062 | 2035 | |
| 72 | Carl Wright | 2.065 | 2005 | |
| 73 | Will Cameron | 2.066 | 2003 | |
| 74 | Kelton Juneau | 2.068 | 2000 | |
| 75 | Guy Ayotte | 2.073 | 2001 | |
| 75 | Bill Beals# | 2.073 | 2058 | |
| 77 | Will Higgins | 2.086 | 2010 | |
| 78 | Diego García | 2.088 | 2025 | |
| 79 | Leonardo Ramos | 2.090 | 2054 | |
| 80 | Belen Sardzetakis# | 2.094 | 2061 | |
| 81 | Ramón Farías | 2.095 | 2015 | |
| 82 | Fletcher Brown | 2.102 | 2056 | |
| 83 | Duane Russell | 2.104 | 2014 | |
| 84 | Norman Stewart | 2.115 | 2000 | |
| 85 | Miguel González | 2.125 | 2001 | |
| 86 | Luis Téllez | 2.132 | 2022 | |
| 87 | Nelson Barras | 2.135 | 1996 | |
| 88 | Richard Dallaire | 2.136 | 2018 | |
| 88 | Steven Nelson | 2.136 | 2001 | |
| 90 | Robert Shaffer | 2.140 | 2004 | |
| 90 | Cameron Bennett | 2.140 | 2004 | |
| 92 | Bob Snider | 2.142 | 2057 | |
| 93 | Royce Maris# | 2.143 | 2059 | |
| 94 | Vernon Fredette | 2.150 | 1998 | |
| 95 | Alvin Anstey# | 2.158 | 2053 | |
| 96 | Bertolameu Bolota | 2.162 | 2015 | |
| 97 | Terry Dumont | 2.164 | 2001 | |
| 98 | Adrian Alvarez | 2.166 | 1998 | |
| 98 | Tadahisa Tanaka# | 2.166 | 2059 | |
| 98 | Moises Rentas | 2.166 | 1998 |
