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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Walt Porter# | 0.973 | 2027-2041 | |
| 2 | Junior Castillo | 1.107 | 2014-2032 | |
| 3 | Pedro Chávez | 1.200 | 2013-2013 | |
| 4 | Alberto Caballero# | 1.452 | 2036-2041 | |
| 4 | Koto Sekiguchi | 1.452 | 2019-2020 | |
| 6 | Juan Flores | 1.575 | 2012-2021 | |
| 7 | Gabriel Gutiérrez | 1.736 | 2011-2020 | |
| 8 | Manuel Piñal# | 1.737 | 2032-2041 | |
| 9 | Jesús Salazar# | 1.816 | 2036-2041 | |
| 10 | Joe Rivera | 2.020 | 2029-2038 | |
| 11 | Mal Benton | 2.031 | 2017-2029 | |
| 12 | Martín Martínez# | 2.107 | 2028-2041 | |
| 13 | Héctor Pinto | 2.113 | 2012-2013 | |
| 14 | Emílio García# | 2.152 | 2040-2041 | |
| 15 | Jesús Cantú | 2.275 | 2019-2040 | |
| 16 | Javier Gómez | 2.311 | 2014-2025 | |
| 17 | Ángel Valdéz | 2.354 | 2017-2026 | |
| 18 | Alonso Flores# | 2.380 | 2030-2041 | |
| 19 | Eduardo Camacho# | 2.430 | 2027-2041 | |
| 20 | Miguel Cordero# | 2.461 | 2027-2041 | |
| 21 | Humberto Hernández# | 2.557 | 2035-2041 | |
| 22 | Rafael Salas# | 2.560 | 2023-2041 | |
| 23 | Carlton Minor# | 2.562 | 2027-2041 | |
| 24 | Ron Gómez# | 2.576 | 2024-2041 | |
| 25 | Xavier González | 2.591 | 2014-2036 | |
| 26 | Gary Edwards | 2.684 | 2009-2018 | |
| 27 | Tony Salazar# | 2.718 | 2029-2041 | |
| 28 | José Flores | 2.725 | 2027-2029 | |
| 29 | Nathan Barton | 2.755 | 2015-2020 | |
| 30 | Jason Meléndez# | 2.793 | 2037-2041 | |
| 31 | José Santos | 2.802 | 2012-2026 | |
| 32 | Luis Cantú | 2.817 | 2022-2027 | |
| 33 | Martin Rodríguez# | 2.864 | 2034-2041 | |
| 34 | José Méndez | 2.899 | 2012-2025 | |
| 35 | Clark Vallés# | 2.931 | 2029-2041 | |
| 36 | Fred Negrón | 2.938 | 2013-2015 | |
| 37 | Jorge Alou | 2.993 | 2021-2039 | |
| 38 | George Haines | 3.000 | 2019-2020 | |
| 39 | Juan Martínez | 3.019 | 2012-2025 | |
| 40 | Tomás Esparza | 3.090 | 2012-2039 | |
| 41 | Ken Martínez# | 3.140 | 2031-2041 | |
| 42 | Juan Alvarado | 3.273 | 2019-2038 | |
| 43 | Jerry Collins | 3.384 | 2007-2024 | |
| 44 | Jorge Valentín | 3.423 | 2030-2040 | |
| 45 | Gustavo Luján# | 3.434 | 2029-2040 | |
| 46 | José Gonzáles# | 3.480 | 2027-2041 | |
| 47 | Arturo Ramírez | 3.493 | 2013-2029 | |
| 48 | Manuel Ávila# | 3.518 | 2021-2041 | |
| 49 | Pedro Concepción | 3.522 | 2018-2020 | |
| 50 | António Rodríguez# | 3.570 | 2028-2041 | |
| 51 | Eiichi Nakao | 3.584 | 2010-2020 | |
| 52 | Domingo Pérez# | 3.590 | 2036-2041 | |
| 53 | Diego Perales | 3.780 | 2011-2012 | |
| 54 | Alfredo García | 3.813 | 2015-2028 | |
| 55 | Johnny MacKinney | 3.857 | 2017-2020 | |
| 56 | Juan Gonzáles | 3.886 | 2023-2040 | |
| 57 | Juan Olivares | 4.084 | 2007-2010 | |
| 58 | César Rodríguez | 4.219 | 2007-2011 | |
| 59 | Ángel López# | 4.274 | 2031-2041 | |
| 60 | Fernando Vásquez# | 4.370 | 2030-2041 | |
| 61 | Jorge Escamilla# | 4.531 | 2025-2041 | |
| 62 | José López | 4.696 | 2009-2018 | |
| 63 | José Rodríguez | 4.891 | 2028-2037 | |
| 64 | Juan Romo# | 5.143 | 2034-2041 | |
| 65 | Jay Black# | 5.175 | 2021-2041 | |
| 66 | Emílio Alvarado | 5.192 | 2007-2012 | |
| 66 | Cristián Básquez | 5.192 | 2007-2009 | |
| 68 | David López | 5.202 | 2014-2037 | |
| 69 | Jerome Beaton | 5.333 | 2007-2013 | |
| 70 | Kevin Orozco# | 5.447 | 2028-2041 | |
| 71 | Rafael Quintero | 5.505 | 2027-2035 | |
| 72 | Dave Smith | 5.651 | 2009-2012 | |
| 73 | Tomás Baldomado# | 5.712 | 2031-2041 | |
| 74 | Juan Román | 6.300 | 2014-2024 | |
| 75 | Armando Rodríguez# | 6.688 | 2030-2041 |
