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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Steve Nebraska* | 2.040 | 1973-1991 | |
| 2 | Shawn Huber* | 2.452 | 2031-2050 | |
| 3 | Skip Glendenning* | 2.567 | 2016-2033 | |
| 4 | Heath Rockefeller* | 2.584 | 1985-1996 | |
| 5 | Mark Bobovnik* | 2.697 | 1979-1992 | |
| 6 | Johan Schmatzhagen* | 2.703 | 1973-1984 | |
| 7 | Tiernan O'Macken | 2.772 | 2040-2058 | |
| 7 | Pedro Espín | 2.772 | 2010-2025 | |
| 9 | Todd Stone# | 2.788 | 2047-2058 | |
| 10 | Vernon Simpson* | 2.810 | 1973-1978 | |
| 11 | Lionel Sanguinacco | 2.856 | 2010-2025 | |
| 12 | Mike Swanson* | 2.877 | 2014-2026 | |
| 13 | Ángel Hernández | 2.891 | 2039-2055 | |
| 14 | Jay Lee* | 2.904 | 1994-2009 | |
| 15 | Paul Hogan | 2.909 | 2002-2017 | |
| 16 | Jonathan Sorensen | 2.914 | 2006-2024 | |
| 17 | Jason Egan* | 2.915 | 1997-2017 | |
| 18 | Jerry Syed* | 2.916 | 1976-1990 | |
| 19 | Roberto Ramírez | 2.935 | 2041-2056 | |
| 20 | Corey Aubrey | 2.937 | 1974-1988 | |
| 21 | Evander Kilkenny | 2.941 | 1985-1997 | |
| 22 | Lorenzo de' Medici | 2.953 | 2037-2056 | |
| 23 | Roy Hobbs, Jr.* | 2.954 | 1973-1982 | |
| 24 | Kurt Stallwith* | 2.969 | 1973-1984 | |
| 25 | Ken Howell* | 2.976 | 1984-2005 | |
| 26 | Marcellus Conley | 3.043 | 1973-1981 | |
| 27 | McKinley Washington | 3.052 | 1992-2008 | |
| 28 | Al Colbert | 3.066 | 2042-2054 | |
| 29 | Reynaldo Garza | 3.078 | 2020-2036 | |
| 30 | Gil Daniels | 3.099 | 1983-1996 | |
| 31 | Sam Kirkpatrick | 3.110 | 1982-1994 | |
| 32 | Carl MacNeill | 3.127 | 2005-2015 | |
| 33 | Ivan Aguilera | 3.140 | 1977-1988 | |
| 34 | Luis Manuel Rodríguez | 3.143 | 2043-2057 | |
| 35 | Martin Román# | 3.145 | 2043-2058 | |
| 36 | John Ross Riles, Jr.* | 3.166 | 1981-2002 | |
| 37 | Ricardo Díaz* | 3.180 | 2019-2038 | |
| 38 | Bryan Canniff | 3.190 | 1973-1983 | |
| 39 | Richard Wasson | 3.197 | 1992-2011 | |
| 40 | Jonathan Bowen | 3.211 | 2021-2035 | |
| 41 | Bill Constable# | 3.213 | 2044-2057 | |
| 42 | Chris Malone | 3.215 | 2000-2017 | |
| 43 | Bob Sanderson | 3.219 | 2022-2037 | |
| 44 | Andy Messersmith | 3.225 | 1976-1983 | |
| 45 | Manuel Cruz | 3.226 | 2040-2054 | |
| 46 | James Browning | 3.230 | 2041-2053 | |
| 47 | Bill Max* | 3.231 | 1975-1989 | |
| 48 | Christopher Stoller* | 3.244 | 1996-2011 | |
| 49 | James Raya | 3.253 | 1975-1986 | |
| 50 | Julio Guillerma | 3.255 | 1973-1983 | |
| 51 | Miguel Datiz | 3.258 | 2023-2034 | |
| 52 | Enrique Gómez* | 3.261 | 2022-2038 | |
| 53 | Timothy Regina | 3.262 | 1982-1997 | |
| 54 | Manny Bautista* | 3.269 | 2017-2031 | |
| 55 | Marco Vitalle | 3.274 | 2039-2049 | |
| 56 | Barney Lindsay# | 3.281 | 2045-2058 | |
| 57 | Gary Wilson | 3.290 | 2001-2019 | |
| 57 | Manuel Ramírez* | 3.290 | 2018-2035 | |
| 59 | Michael Shellenbarger | 3.300 | 1992-2006 | |
| 60 | Luis Ortega | 3.302 | 2032-2047 | |
| 61 | Brian Smith | 3.305 | 2040-2056 | |
| 62 | Cristián García | 3.308 | 2041-2053 | |
| 63 | Gilberto Sosa | 3.310 | 2041-2055 | |
| 63 | David Crocker | 3.310 | 2000-2014 | |
| 65 | Justin Alexander* | 3.313 | 1976-1992 | |
| 66 | Allen Izatt* | 3.315 | 1992-2010 | |
| 66 | Eduardo López | 3.315 | 2021-2035 | |
| 68 | Floyd Bannister | 3.320 | 1983-1996 | |
| 69 | Allan Atkins | 3.330 | 1984-1998 | |
| 70 | George Thrilkil | 3.334 | 1976-1993 | |
| 71 | Robbie Sargent* | 3.338 | 1998-2016 | |
| 72 | Dave Corfield# | 3.340 | 2046-2058 | |
| 73 | Bernie Stuart# | 3.346 | 2045-2058 | |
| 74 | Voo Fowler | 3.348 | 1973-1983 | |
| 75 | Brock Rutherford | 3.349 | 1973-1979 | |
| 76 | Luis Freitas | 3.352 | 2017-2027 | |
| 77 | Renato Lacerda# | 3.357 | 2039-2058 | |
| 78 | Shane Wookey | 3.359 | 1994-2009 | |
| 79 | Carlos Flores# | 3.373 | 2043-2058 | |
| 80 | Luis Tiant IV | 3.380 | 2013-2026 | |
| 81 | Gabriel Campos* | 3.381 | 2012-2026 | |
| 82 | Juan Quintero | 3.384 | 1998-2016 | |
| 83 | Ron Burgundy | 3.393 | 1992-2005 | |
| 84 | Rubén Vázquez# | 3.395 | 2043-2058 | |
| 85 | Nick Sixx | 3.396 | 1973-1978 | |
| 86 | Larry Lasalle* | 3.397 | 1994-2007 | |
| 86 | Nelson Ramírez* | 3.397 | 2020-2034 | |
| 86 | Billy Chapel | 3.397 | 1973-1980 | |
| 89 | José Olivarez | 3.399 | 2022-2029 | |
| 90 | Jorge Stanza | 3.400 | 2018-2035 | |
| 90 | Michael Strathallan* | 3.400 | 2005-2018 | |
| 92 | Javier Alomar | 3.402 | 2006-2020 | |
| 93 | Narciso Jarilla | 3.403 | 1973-1982 | |
| 94 | Ricardo Valera | 3.406 | 2018-2037 | |
| 95 | Frank Rogers | 3.408 | 1974-1988 | |
| 96 | Ebby Calvin LaLoosh | 3.411 | 1973-1980 | |
| 97 | Claver Olmeda | 3.414 | 1982-1993 | |
| 98 | Amen Mitrani* | 3.417 | 1995-2009 | |
| 99 | Félix Alvarado | 3.420 | 2026-2040 | |
| 100 | Carlos Valle* | 3.422 | 2035-2053 |
