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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Ralph Small | 2.841 | 1970-1975 | |
| 2 | Juan Ortega | 2.851 | 1970-1974 | |
| 3 | En-guo Shuang | 3.090 | 1970-1976 | |
| 4 | Pat Martin | 3.111 | 1973-1978 | |
| 5 | Ramón Pérez | 3.207 | 1972-1978 | |
| 6 | Jed Hairston | 3.218 | 2005-2014 | |
| 7 | Matt White | 3.359 | 1972-1977 | |
| 8 | Reggie Dunbar | 3.436 | 1975-1981 | |
| 9 | John Larson | 3.461 | 2007-2014 | |
| 10 | John Morrison | 3.498 | 1975-1980 | |
| 11 | Todd Fowler | 3.506 | 2010-2015 | |
| 12 | Luis Villarreal | 3.569 | 1999-2010 | |
| 13 | Joe Huff | 3.580 | 1985-1993 | |
| 14 | Patrick Thompson | 3.608 | 1970-1974 | |
| 15 | José Gallardo | 3.627 | 1983-1990 | |
| 16 | Tokaji Sato | 3.648 | 2012-2021 | |
| 17 | Lee Bentley | 3.678 | 2004-2015 | |
| 18 | Okura Agano | 3.684 | 1970-1982 | |
| 19 | Andrew Beck | 3.692 | 1970-1974 | |
| 20 | Luis Crespo | 3.697 | 1976-1983 | |
| 21 | Jon Robinson | 3.698 | 1971-1978 | |
| 22 | Reese Maxwell | 3.700 | 1994-2001 | |
| 22 | Albert Parker | 3.700 | 1974-1981 | |
| 24 | William Hyde# | 3.703 | 2015-2023 | |
| 25 | Marcos Meléndez | 3.711 | 1989-1993 | |
| 26 | Manny Castillo | 3.717 | 1970-1974 | |
| 27 | Orlando Miranda | 3.767 | 1970-1975 | |
| 28 | Joseph Joicey | 3.783 | 1971-1978 | |
| 29 | Terry Wiley | 3.792 | 1970-1974 | |
| 29 | Sandor Derksen | 3.792 | 1998-2008 | |
| 31 | Bob Brandt | 3.797 | 1995-2001 | |
| 32 | Darren Brown# | 3.799 | 2015-2022 | |
| 33 | Harrison Batt | 3.808 | 2007-2013 | |
| 34 | Mauro Herrera | 3.818 | 1970-1975 | |
| 35 | Miguel Vela | 3.821 | 1975-1980 | |
| 36 | Héctor García# | 3.833 | 2012-2022 | |
| 37 | Sergio Torres | 3.837 | 1981-1989 | |
| 38 | Dirk Gibson | 3.840 | 1981-1986 | |
| 39 | Sergio Candelária | 3.843 | 1970-1973 | |
| 40 | Todd Daniel | 3.859 | 1984-1995 | |
| 41 | Jeff DeWalt | 3.861 | 1984-1997 | |
| 42 | Chris Brown | 3.873 | 2004-2016 | |
| 43 | António Hernández | 3.879 | 2003-2014 | |
| 44 | Ernest French | 3.882 | 1975-1983 | |
| 45 | Robert Phillips | 3.896 | 2008-2017 | |
| 46 | Jason Anderson | 3.904 | 2008-2015 | |
| 46 | Juan García | 3.904 | 1970-1974 | |
| 48 | Larry George | 3.907 | 1991-1998 | |
| 49 | Carlos García | 3.908 | 1990-1996 | |
| 50 | Tony Feliciano | 3.910 | 1996-2008 | |
| 51 | Tony Fernández | 3.922 | 2008-2013 | |
| 52 | Hubert Hogan | 3.934 | 1985-1994 | |
| 53 | Matt Oliver | 3.938 | 1997-2003 | |
| 54 | Jesús Solís | 3.962 | 1981-1989 | |
| 55 | Paul Steele | 3.965 | 1994-2001 | |
| 56 | Donovan Baker | 3.976 | 1984-1990 | |
| 57 | Jesús Gómez | 3.985 | 1979-1987 | |
| 58 | Harrison Holland | 3.999 | 2013-2020 | |
| 59 | Pedro López | 4.001 | 2004-2015 | |
| 60 | Seth Williams | 4.014 | 1990-1997 | |
| 60 | Bob Young | 4.014 | 1999-2005 | |
| 62 | Dave Wicks | 4.019 | 1970-1976 | |
| 63 | Donald Birchfield# | 4.026 | 2010-2020 | |
| 64 | George Simpson | 4.028 | 2009-2016 | |
| 65 | Jack Davenport | 4.031 | 2008-2015 | |
| 66 | Ed Pride | 4.032 | 1997-2007 | |
| 67 | Neil Hopkins | 4.035 | 2005-2011 | |
| 68 | Dan Holliday | 4.106 | 2013-2020 | |
| 69 | Scot Moodie | 4.114 | 1977-1982 | |
| 70 | Dino Messuti | 4.115 | 1995-2000 | |
| 71 | Thomas Graham | 4.151 | 1986-1991 | |
| 72 | Conner Sanford | 4.152 | 1975-1984 | |
| 73 | Rod Howe | 4.156 | 1971-1974 | |
| 74 | Anthony Tolbert | 4.177 | 1989-1994 | |
| 75 | Nate Spencer | 4.178 | 1970-1982 | |
| 76 | Shawn Scott | 4.186 | 1973-1979 | |
| 76 | Robinson Sánchez | 4.186 | 2003-2010 | |
| 78 | Marc Cox# | 4.195 | 2014-2023 | |
| 79 | Evan Crowder | 4.196 | 1979-1989 | |
| 80 | Jon Cook | 4.208 | 2004-2011 | |
| 80 | Bernie Martin | 4.208 | 1979-1988 | |
| 82 | Pete Partlow | 4.212 | 1974-1981 | |
| 83 | Gregorio Hernández | 4.217 | 2001-2015 | |
| 84 | Gabriel González | 4.222 | 2013-2018 | |
| 85 | Javier Gabriel | 4.224 | 2013-2018 | |
| 86 | Félix Becerra | 4.230 | 1986-1992 | |
| 87 | Joe Perkins | 4.232 | 2003-2008 | |
| 88 | Alfredo Rodríguez | 4.239 | 1973-1977 | |
| 89 | Walt Hamm | 4.247 | 1970-1976 | |
| 90 | Ronnie Jackson | 4.253 | 1970-1974 | |
| 91 | Vincente Álvarez | 4.259 | 1994-2002 | |
| 92 | Willie Green | 4.268 | 1997-2012 | |
| 93 | Ben Fuller | 4.281 | 1985-1992 | |
| 94 | Jerry Cahill | 4.287 | 2005-2012 | |
| 95 | Reggie Wolf | 4.293 | 1996-2003 | |
| 96 | Eugene White | 4.298 | 1971-1976 | |
| 97 | Frank Hart | 4.311 | 1971-1985 | |
| 98 | Dave Catron | 4.312 | 2001-2009 | |
| 99 | José Rivera | 4.321 | 1997-2006 | |
| 100 | Joe Stewart | 4.323 | 2000-2009 |
