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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Chris Thompson | 3.248 | 2010-2016 | |
| 2 | Arthur Wiggins | 3.300 | 1998-2010 | |
| 3 | Lanny MacFadden | 3.456 | 2009-2021 | |
| 4 | Raúl Silva | 3.492 | 2040-2054 | |
| 5 | Pete Decker | 3.516 | 1999-2005 | |
| 6 | Todd Demko | 3.519 | 1995-2005 | |
| 7 | Cary Bogen | 3.524 | 1995-2005 | |
| 8 | José Fernández | 3.530 | 2018-2026 | |
| 9 | Jonathan Hewes | 3.548 | 1995-2008 | |
| 10 | Freddie Montano | 3.572 | 1995-2002 | |
| 11 | Marvin Smith | 3.596 | 1997-2012 | |
| 12 | George Esparza | 3.684 | 1996-2005 | |
| 13 | Cristián Martínez | 3.691 | 2018-2030 | |
| 14 | Aaron Boyce# | 3.721 | 2052-2057 | |
| 15 | Vicente Ramírez | 3.723 | 2002-2012 | |
| 16 | Juan Gonzáles | 3.771 | 2003-2013 | |
| 17 | Dave Hendrickson | 3.790 | 2010-2016 | |
| 18 | Tomás Romero | 3.794 | 2018-2031 | |
| 19 | Tim Mobley | 3.835 | 2023-2032 | |
| 20 | Hud Bannon# | 3.872 | 2045-2053 | |
| 21 | Alfonso Guillén# | 3.893 | 2046-2055 | |
| 22 | Carl Renaud | 3.926 | 1997-2009 | |
| 23 | Juan Reyes | 3.946 | 2036-2048 | |
| 24 | José López | 3.998 | 2036-2046 | |
| 25 | Armando Garza# | 3.999 | 2046-2052 | |
| 26 | Terry Boutilier | 4.010 | 2034-2043 | |
| 27 | Ferdy Ruano | 4.039 | 1995-2000 | |
| 28 | Tadamichi Yoshida | 4.061 | 2035-2051 | |
| 29 | José Núñez# | 4.064 | 2046-2054 | |
| 30 | Len Harris | 4.068 | 2000-2011 | |
| 31 | Clarence Mitchell | 4.088 | 1997-2008 | |
| 32 | Rudolph Garnica | 4.123 | 1997-2002 | |
| 33 | Carlos Martinez | 4.168 | 1995-2001 | |
| 34 | Sun-wei Yao | 4.344 | 1996-2001 | |
| 35 | Javier Bautista | 4.351 | 2019-2032 | |
| 36 | Félix Jiménez | 4.392 | 2041-2045 | |
| 37 | António López | 4.396 | 2044-2049 | |
| 38 | Nelson Hernández | 4.402 | 2036-2040 | |
| 39 | Hungary Denk | 4.413 | 2033-2039 | |
| 40 | Raúl Calderón | 4.447 | 2039-2045 | |
| 41 | Pedro Cerni | 4.454 | 2032-2036 | |
| 42 | Ray Moore | 4.462 | 2002-2009 | |
| 43 | Dayasagara Suryanarayan | 4.468 | 2046-2052 | |
| 44 | John Campbell Jr. | 4.498 | 2028-2036 | |
| 45 | Geoff Henry | 4.519 | 2004-2015 | |
| 46 | Robert Bernard | 4.548 | 2004-2009 | |
| 47 | Manny Alfonso | 4.627 | 1996-2007 | |
| 48 | Ramón Villarreal | 4.709 | 2019-2025 | |
| 49 | Ernest Wells | 4.736 | 2005-2015 | |
| 50 | Edwin Barbieri | 4.818 | 1995-2005 | |
| 51 | António Barrios | 4.825 | 2037-2045 | |
| 52 | Jorge Nava | 4.900 | 2032-2038 | |
| 53 | Luuk van den Hoek | 4.912 | 2033-2043 | |
| 54 | José Bonilla | 5.285 | 2037-2043 | |
| 55 | Carlos Jones | 5.378 | 2036-2042 | |
| 56 | Quincy Hill | 5.705 | 2043-2049 |
