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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Joseph Pérez | 0.412 | 1998-2010 | |
| 2 | Jorge Flores | 0.513 | 1979-1990 | |
| 3 | José Luna | 0.936 | 1970-1983 | |
| 4 | Jesús López | 1.306 | 1992-2003 | |
| 5 | Kevin Roop | 1.410 | 1970-1981 | |
| 6 | Richard Bryant | 1.475 | 1981-1993 | |
| 7 | Juan Rodríguez# | 1.558 | 2000-2014 | |
| 8 | Gustavo Mena | 1.588 | 1961-1974 | |
| 9 | Roberto Carera | 1.662 | 1987-2002 | |
| 10 | Jeff MacGregor | 1.846 | 1971-1982 | |
| 11 | John Huntingford# | 1.858 | 2001-2014 | |
| 12 | Garrett Olson | 1.979 | 1982-1992 | |
| 13 | Loren Herman | 2.025 | 1966-1982 | |
| 14 | Andy Gilmore | 2.032 | 1993-2009 | |
| 15 | Carlos Campos | 2.043 | 1979-1992 | |
| 16 | John Billings | 2.057 | 1977-1987 | |
| 17 | Bill Rankin | 2.062 | 2000-2012 | |
| 18 | Andre Parks# | 2.126 | 2005-2014 | |
| 19 | Tom Holz | 2.134 | 1980-1993 | |
| 20 | Martín Díaz | 2.140 | 1973-1983 | |
| 21 | Raymond Sylvestre | 2.143 | 1957-1970 | |
| 22 | Jorge Romero | 2.154 | 1963-1981 | |
| 23 | Paul Sizemore | 2.182 | 1981-2000 | |
| 24 | Andrew Dixon | 2.209 | 1976-1984 | |
| 25 | Leonard Bader* | 2.213 | 1978-1999 | |
| 26 | Kevin Banks# | 2.250 | 2007-2014 | |
| 26 | Carlos Westacott | 2.250 | 1981-1996 | |
| 28 | Rafael Randín | 2.269 | 1986-2000 | |
| 29 | Javier Estrada# | 2.282 | 2000-2014 | |
| 30 | Ben Taylor | 2.288 | 1996-2003 | |
| 31 | Ron Jackson | 2.317 | 1988-2001 | |
| 32 | Gonzalo Mesa | 2.318 | 1992-2004 | |
| 33 | José Rodríguez# | 2.323 | 1998-2008 | |
| 34 | Kevin Benton | 2.333 | 1987-2005 | |
| 35 | Ricardo Gutérrez | 2.337 | 2002-2012 | |
| 36 | José Crespo | 2.348 | 1980-1991 | |
| 37 | Felipe Garza* | 2.359 | 1979-1998 | |
| 38 | Eric Speers | 2.374 | 2005-2011 | |
| 39 | Darby Funk# | 2.377 | 1999-2012 | |
| 40 | Dan Soto* | 2.387 | 1984-2000 | |
| 41 | Walt Yates | 2.395 | 1992-2006 | |
| 42 | Russ Scott | 2.396 | 1976-1992 | |
| 43 | David Allen# | 2.406 | 2007-2014 | |
| 44 | Alfredo García# | 2.411 | 2002-2014 | |
| 45 | Mark Parker | 2.415 | 1965-1976 | |
| 46 | Jorge Cabrera | 2.423 | 1978-1992 | |
| 47 | Christopher Davis | 2.430 | 1974-1988 | |
| 48 | Orlando García# | 2.431 | 2004-2014 | |
| 49 | Robert Stadler* | 2.455 | 1952-1963 | |
| 50 | David Villarreal | 2.466 | 1989-2006 | |
| 51 | Bill Greene* | 2.471 | 1988-2004 | |
| 52 | Arturo Avilés# | 2.472 | 1998-2014 | |
| 53 | Larry McMunn | 2.475 | 1973-1984 | |
| 54 | Jackson Mendoza# | 2.477 | 2008-2014 | |
| 55 | Paco Padilla | 2.483 | 1999-2011 | |
| 56 | Wilbur Smith | 2.488 | 1964-1979 | |
| 57 | William Butler | 2.492 | 1978-1994 | |
| 58 | David Griffin | 2.496 | 1964-1972 | |
| 59 | Pablo Contreras* | 2.504 | 1970-1985 | |
| 60 | Mario Pérez# | 2.518 | 2002-2014 | |
| 61 | Curtis Graves* | 2.549 | 1978-1991 | |
| 62 | Eric Bell | 2.551 | 1992-2001 | |
| 62 | Jamie Key | 2.551 | 1964-1976 | |
| 64 | Pedro Gabriel# | 2.558 | 2004-2014 | |
| 65 | Edward Whatley | 2.562 | 1997-2011 | |
| 66 | Alberto Barajas# | 2.567 | 2004-2014 | |
| 67 | Brenton Bevins | 2.579 | 1958-1973 | |
| 68 | León Vega | 2.581 | 1976-1993 | |
| 69 | David Bright# | 2.589 | 2001-2014 | |
| 70 | Michael Callahan | 2.600 | 1975-1994 | |
| 71 | Santiago Gómez | 2.607 | 1968-1975 | |
| 72 | Carlos Torres | 2.618 | 1981-1990 | |
| 73 | Danny Cook | 2.638 | 1982-1998 | |
| 74 | Dan-zu Sen# | 2.668 | 2003-2014 | |
| 75 | Bill Henderson* | 2.672 | 1978-1993 | |
| 76 | Chris Thomas | 2.673 | 1970-1989 | |
| 77 | Pedro Rivera | 2.675 | 1999-2010 | |
| 78 | Dustin Hines | 2.677 | 1995-2011 | |
| 79 | Cameron Miller | 2.683 | 1993-2003 | |
| 80 | Rafael Pérez | 2.700 | 1992-2005 | |
| 80 | Chris Thompson# | 2.700 | 2001-2009 | |
| 82 | José Ortíz | 2.716 | 1995-2009 | |
| 83 | Román Manuel | 2.717 | 1996-2009 | |
| 84 | Domingo Morán* | 2.742 | 1975-1989 | |
| 85 | Fernando Blanco | 2.752 | 1968-1982 | |
| 86 | James Thomas# | 2.766 | 2002-2014 | |
| 87 | Dan Cooke | 2.790 | 1976-1991 | |
| 88 | Gregory Davis | 2.797 | 1976-1987 | |
| 88 | Cody Watson | 2.797 | 1981-1994 | |
| 90 | William Harris | 2.801 | 1980-1993 | |
| 91 | Ramón Cruz* | 2.823 | 1980-2001 | |
| 92 | John Cordero | 2.829 | 1989-2003 | |
| 92 | Dallas Farmer | 2.829 | 1998-2014 | |
| 94 | César Hidalgo | 2.834 | 1972-1983 | |
| 95 | Manuel Cline | 2.842 | 1991-2005 | |
| 96 | Alejandro Quintero | 2.850 | 1996-2012 | |
| 97 | John McNeil | 2.851 | 1970-1987 | |
| 98 | Julian Wood* | 2.865 | 1962-1977 | |
| 99 | Cristóbal Moreno# | 2.867 | 2004-2014 | |
| 100 | Harry Pettitt | 2.872 | 1952-1969 |
