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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Curt Kelly | 3.159 | 1976-1981 | |
| 2 | Juan Jose Navarro | 3.236 | 1970-1975 | |
| 3 | Dale Marsh | 3.332 | 2003-2014 | |
| 4 | Juan Rivera | 3.368 | 1970-1974 | |
| 5 | Ollie Shirley | 3.397 | 1970-1976 | |
| 6 | Pete Davis | 3.403 | 1970-1976 | |
| 7 | James Goff | 3.426 | 1975-1982 | |
| 8 | Alfredo Benavides | 3.464 | 1971-1980 | |
| 9 | Pedro García | 3.535 | 1970-1976 | |
| 10 | Zach Henry | 3.585 | 2007-2019 | |
| 11 | César López | 3.589 | 1979-1983 | |
| 12 | Clarence Gross | 3.594 | 1972-1976 | |
| 13 | Mike Hood | 3.611 | 1970-1980 | |
| 14 | Trevor Roberts | 3.642 | 1970-1974 | |
| 15 | Sean Russell | 3.650 | 2007-2013 | |
| 16 | Doug Smith | 3.673 | 1992-1997 | |
| 17 | Dan Tate | 3.689 | 1973-1979 | |
| 18 | Augusto Rodríguez | 3.747 | 1977-1983 | |
| 19 | Darby Knox | 3.755 | 1971-1981 | |
| 20 | Felipe Brito | 3.803 | 2001-2012 | |
| 21 | José Vásquez | 3.810 | 1996-2003 | |
| 22 | Aaron Lyon | 3.818 | 2007-2015 | |
| 23 | Alonso Barrera | 3.822 | 1970-1979 | |
| 24 | Ed Brunskill | 3.845 | 2014-2020 | |
| 25 | David Angle | 3.854 | 1970-1973 | |
| 26 | Wilson Fernández | 3.922 | 1970-1978 | |
| 27 | Edwin Wills | 3.929 | 1970-1976 | |
| 28 | Toshinobu Ohayashi | 3.932 | 2001-2015 | |
| 29 | William Parsons | 3.944 | 1973-1980 | |
| 30 | William Hickman | 3.950 | 1996-2003 | |
| 31 | Buddy Morgan | 3.957 | 2001-2009 | |
| 32 | Tom Hammond | 4.014 | 1972-1977 | |
| 33 | Louie Miner | 4.034 | 2010-2018 | |
| 34 | Brendan Farris | 4.051 | 1972-1976 | |
| 35 | Luis Marín | 4.053 | 1998-2003 | |
| 36 | Ramón Gutiérrez | 4.058 | 2000-2009 | |
| 37 | Juan Montés | 4.059 | 1986-1992 | |
| 38 | Aaron Nelson | 4.061 | 1995-2001 | |
| 39 | Ben Cunningham# | 4.069 | 2012-2022 | |
| 40 | Jorge Morales | 4.093 | 1991-1999 | |
| 41 | Jeffrey Frank | 4.098 | 1971-1976 | |
| 42 | Jacob Gross | 4.108 | 1973-1978 | |
| 43 | Adam Fowler | 4.109 | 1995-2000 | |
| 43 | Armando Limón | 4.109 | 1991-1995 | |
| 45 | Juan Gonzáles | 4.110 | 2010-2016 | |
| 46 | Bill Norton | 4.115 | 1984-1989 | |
| 47 | Alfredo Rodríguez | 4.121 | 1977-1993 | |
| 48 | Craig Mullen | 4.132 | 1997-2003 | |
| 49 | Bobby Morrison | 4.134 | 2005-2014 | |
| 50 | David Oglethorpe | 4.154 | 1980-1990 | |
| 51 | Jesús Esparza | 4.168 | 2007-2013 | |
| 52 | Tim Moore | 4.177 | 1994-1999 | |
| 53 | Sal Harding# | 4.188 | 2017-2022 | |
| 54 | John Hodge | 4.195 | 2006-2014 | |
| 55 | Cristián Castillo | 4.198 | 1971-1982 | |
| 56 | Ramón Reyes | 4.208 | 1978-1985 | |
| 57 | Virgil Tucker | 4.219 | 2011-2017 | |
| 58 | James Wilson | 4.241 | 1996-2002 | |
| 59 | Justin Thomas | 4.259 | 2016-2021 | |
| 60 | Mark Brandon | 4.267 | 1987-1998 | |
| 60 | George Glendenning | 4.267 | 1991-1996 | |
| 62 | Mauro Rodríguez | 4.271 | 1992-2004 | |
| 63 | Kevin Thomas | 4.285 | 1970-1979 | |
| 64 | Luis Villegas | 4.292 | 2011-2021 | |
| 65 | Nathan Clark | 4.297 | 1991-1998 | |
| 66 | Lindsay Armstrong | 4.300 | 2001-2009 | |
| 67 | Josh Valentine | 4.318 | 1983-1988 | |
| 68 | Alejandro González | 4.319 | 2002-2010 | |
| 69 | Félix Pineda | 4.324 | 2004-2014 | |
| 70 | Dave Richter | 4.325 | 1978-1984 | |
| 71 | Randy Wright | 4.336 | 1995-2003 | |
| 72 | Eric Callwood | 4.342 | 2005-2019 | |
| 73 | Silas Phipps | 4.343 | 1981-1990 | |
| 74 | Jimmy Robertson | 4.367 | 1978-1987 | |
| 75 | William Parker | 4.374 | 2002-2012 | |
| 76 | Wilson Fernández | 4.376 | 1977-1983 | |
| 77 | Frank Gordon | 4.388 | 1985-1998 | |
| 77 | Jim Martin | 4.388 | 1995-1999 | |
| 77 | Gonzalo Águila | 4.388 | 1970-1976 | |
| 80 | David Witt | 4.399 | 1970-1976 | |
| 81 | Bill Connor | 4.412 | 1999-2008 | |
| 82 | Miguel Germán# | 4.419 | 2006-2022 | |
| 83 | Jorge Torres | 4.432 | 2002-2016 | |
| 84 | Ángel Amaya# | 4.436 | 2016-2023 | |
| 85 | Jesús Reyes | 4.452 | 2005-2015 | |
| 86 | John Davidson | 4.454 | 2008-2016 | |
| 87 | Jeff Cook | 4.491 | 2009-2015 | |
| 88 | Forest Ricks | 4.511 | 2000-2006 | |
| 89 | Chris Edwards | 4.515 | 2009-2014 | |
| 90 | Steve Black | 4.529 | 1971-1977 | |
| 90 | Luke Wallace | 4.529 | 2012-2018 | |
| 92 | Jayson Lord | 4.534 | 1980-1987 | |
| 93 | Chris Flanagan | 4.547 | 2015-2020 | |
| 94 | Curt Moore | 4.548 | 1987-1993 | |
| 95 | Kyle Monroe | 4.574 | 1973-1979 | |
| 96 | Stephen Dannatt | 4.578 | 1998-2006 | |
| 96 | Curt Jones | 4.578 | 1984-1991 | |
| 96 | Enrique Díaz | 4.578 | 2011-2017 | |
| 99 | Alan Holley | 4.580 | 2012-2020 | |
| 99 | Fernando Nieves | 4.580 | 1979-1985 |
