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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Lance Carlson | 2.965 | 2046-2060 | |
| 2 | Juan López | 2.973 | 2029-2044 | |
| 3 | Ánibal Moya | 2.978 | 2007-2018 | |
| 4 | John Andrasko | 3.023 | 2061-2069 | |
| 5 | Cris Vázquez | 3.080 | 1991-1997 | |
| 6 | Mike Saunders | 3.100 | 2018-2025 | |
| 7 | George Bryant | 3.162 | 2030-2042 | |
| 8 | Carlos Vázquez | 3.236 | 2045-2055 | |
| 9 | Orlando Espinosa | 3.240 | 2025-2038 | |
| 10 | Víctor Flores | 3.247 | 2009-2014 | |
| 11 | Lúcio Olvera | 3.251 | 2018-2030 | |
| 12 | Alejandro Fuentes | 3.258 | 2040-2049 | |
| 13 | Scott Randell# | 3.298 | 2066-2075 | |
| 14 | Micah Moran | 3.313 | 2013-2019 | |
| 15 | John Banks | 3.315 | 2018-2025 | |
| 16 | John Scott | 3.332 | 2000-2009 | |
| 17 | John Cooper | 3.342 | 2038-2053 | |
| 18 | Brodie Hynes | 3.348 | 2017-2023 | |
| 19 | Ken Gunn | 3.368 | 2003-2011 | |
| 20 | Leonardo Flores | 3.376 | 1990-1995 | |
| 21 | Mike Palmer | 3.380 | 2038-2048 | |
| 22 | Christopher Wicks | 3.405 | 1997-2010 | |
| 23 | Andrew Rice | 3.441 | 1990-1995 | |
| 24 | Alex Harris | 3.454 | 2027-2044 | |
| 24 | Brad Skyrme | 3.454 | 2048-2055 | |
| 26 | John Clark | 3.460 | 1990-1999 | |
| 27 | Jesús Reyna | 3.474 | 2004-2015 | |
| 28 | Francisco Ibarra | 3.485 | 2018-2023 | |
| 29 | Dennis Flynn | 3.488 | 2014-2028 | |
| 30 | Pedro García | 3.506 | 2005-2012 | |
| 31 | Andrés Campos | 3.508 | 2003-2012 | |
| 32 | Geer Pels | 3.514 | 2049-2058 | |
| 33 | Taizo Yamashita | 3.528 | 2017-2030 | |
| 34 | Carlos Ramos | 3.533 | 2023-2034 | |
| 35 | Ronald Ball | 3.539 | 2024-2038 | |
| 36 | Jeff Miller | 3.541 | 1998-2006 | |
| 37 | Iván Ortíz | 3.542 | 2027-2034 | |
| 38 | Will Blair | 3.565 | 2005-2014 | |
| 39 | Pat Boudreau | 3.570 | 2042-2053 | |
| 40 | Millard Bolton | 3.595 | 1991-2002 | |
| 41 | Mike Witty | 3.602 | 1993-2002 | |
| 42 | David Gore | 3.616 | 2021-2027 | |
| 43 | Kyle Ropley | 3.643 | 2018-2025 | |
| 44 | Jeremy McKinley | 3.655 | 2012-2017 | |
| 45 | José Serrano | 3.661 | 2024-2031 | |
| 46 | Jonathon Roesler | 3.734 | 2030-2036 | |
| 47 | José Flores | 3.742 | 2030-2039 | |
| 48 | Robbie DeBalliol | 3.743 | 2029-2042 | |
| 49 | Matt Meyer | 3.750 | 2061-2068 | |
| 50 | Andy Seymour | 3.753 | 2005-2013 | |
| 51 | Edward Housden | 3.771 | 1990-1995 | |
| 52 | Antonin Dubé | 3.784 | 2014-2026 | |
| 53 | Chris Thomas | 3.787 | 1990-1999 | |
| 54 | Sandro Fardelhoa | 3.798 | 2023-2027 | |
| 55 | Geoffroy Paolillo | 3.826 | 2054-2060 | |
| 56 | Reginald Michael | 3.827 | 2037-2050 | |
| 57 | Michael Kramer | 3.828 | 1991-2004 | |
| 57 | Orlando Zavala | 3.828 | 2028-2045 | |
| 59 | Javier Valverde | 3.829 | 2049-2056 | |
| 60 | Juan Melendez | 3.838 | 2057-2065 | |
| 61 | Craig Meyers | 3.869 | 2041-2051 | |
| 62 | Joseph Powers | 3.925 | 2024-2038 | |
| 63 | José Reyes | 3.928 | 1994-2000 | |
| 64 | Mark Charles | 3.932 | 1994-2007 | |
| 64 | Paul Burton | 3.932 | 1997-2007 | |
| 66 | Ron Taylor | 3.938 | 1998-2005 | |
| 67 | Cristovão Janela | 3.948 | 2049-2062 | |
| 68 | Clyde Givens | 3.958 | 1997-2002 | |
| 69 | Wibren Gouloze | 3.965 | 2020-2028 | |
| 70 | Gabriel Carrillo | 3.969 | 2057-2063 | |
| 71 | Herman Vickers | 3.971 | 2022-2028 | |
| 72 | Dave Jackson | 3.981 | 2004-2011 | |
| 73 | Jesús Rodríguez | 4.002 | 2045-2056 | |
| 74 | Ron Bullard | 4.008 | 2004-2013 | |
| 75 | Ken Riley | 4.029 | 1990-1995 | |
| 76 | Burt Kuhn | 4.066 | 1990-1997 | |
| 77 | Craig Burch | 4.070 | 2039-2047 | |
| 78 | Robby George | 4.073 | 2007-2016 | |
| 79 | Tom Mays | 4.094 | 2004-2012 | |
| 80 | Juan Jose Alvarado | 4.108 | 1991-1998 | |
| 81 | Duane Bear | 4.124 | 2024-2032 | |
| 82 | José Rodríguez | 4.130 | 2045-2058 | |
| 83 | Bengt Broos | 4.156 | 2054-2063 | |
| 84 | Eduardo Pérez | 4.164 | 2012-2017 | |
| 85 | Jesús Camacho | 4.166 | 1999-2010 | |
| 86 | Scott de Weever | 4.170 | 2048-2062 | |
| 87 | Ronald Coleman | 4.209 | 1990-1995 | |
| 88 | Mark Woods | 4.229 | 1990-2001 | |
| 89 | Luis Maes | 4.259 | 2004-2015 | |
| 90 | Henry Warner | 4.268 | 2030-2040 | |
| 91 | David Avalos | 4.269 | 2065-2074 | |
| 92 | Jorge Gómez | 4.291 | 1992-2004 | |
| 93 | Naruhiko Abe | 4.299 | 2023-2032 | |
| 94 | Larry Mears | 4.341 | 2063-2071 | |
| 94 | Colton Welch | 4.341 | 1997-2007 | |
| 96 | Mike Hayward | 4.351 | 2058-2066 | |
| 97 | Ánibal Archuleta | 4.359 | 1992-2007 | |
| 98 | Joe Ferguson | 4.393 | 2062-2067 | |
| 99 | Dale Talley | 4.459 | 2027-2035 | |
| 100 | Bob Boyce | 4.494 | 2016-2024 |
