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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Jesús Muñóz# | 1.245 | 2037 | |
| 2 | Álex Martínez | 1.265 | 2013 | |
| 3 | Pedro Barrón | 1.609 | 2009 | |
| 4 | Eduardo Romano | 1.626 | 2021 | |
| 5 | António Lima# | 1.656 | 2037 | |
| 6 | Valentim Ornelas | 1.676 | 2021 | |
| 7 | Jesús Muñóz# | 1.736 | 2031 | |
| 8 | Alfredo Gonzáles# | 1.809 | 2031 | |
| 9 | Roberto Rivera# | 1.860 | 2031 | |
| 10 | Norm Hawk | 1.880 | 2013 | |
| 11 | Carlos Camacho | 1.899 | 2021 | |
| 12 | Carlos Moreno | 1.909 | 2011 | |
| 13 | Gerardo Díaz# | 1.937 | 2036 | |
| 14 | José Campos# | 1.941 | 2036 | |
| 15 | Norris Moncreiff | 1.946 | 2012 | |
| 16 | Edgar Moreno# | 1.969 | 2036 | |
| 17 | Ramón Villalobos# | 1.972 | 2037 | |
| 18 | Arthur Graham | 1.976 | 2013 | |
| 19 | Cristián De Jesús | 1.983 | 2010 | |
| 20 | Manuel Muñóz# | 1.996 | 2036 | |
| 21 | Fernando Hernández | 2.026 | 2011 | |
| 22 | Mario Mendoza | 2.092 | 2010 | |
| 23 | Sergio Pinzón# | 2.096 | 2034 | |
| 24 | Alejandro Soto# | 2.104 | 2037 | |
| 25 | Júlio Torres | 2.109 | 2024 | |
| 26 | Dan Bradford | 2.143 | 2011 | |
| 27 | Félix Villalobas# | 2.145 | 2036 | |
| 28 | Pedro Barrón | 2.146 | 2010 | |
| 29 | Blaine Cutright | 2.151 | 2021 | |
| 30 | Roberto Alonaso# | 2.181 | 2037 | |
| 31 | Ricardo Encarnación# | 2.189 | 2039 | |
| 32 | Julián Alaniz# | 2.194 | 2036 | |
| 33 | Jorge Amézaga# | 2.206 | 2039 | |
| 34 | Manuel Muñóz# | 2.210 | 2039 | |
| 35 | Luis Mendoza# | 2.219 | 2038 | |
| 36 | Arturo Luna# | 2.229 | 2037 | |
| 37 | Lou Cunningham | 2.237 | 2011 | |
| 38 | Jesús Muñóz# | 2.246 | 2036 | |
| 39 | Carlos Flores# | 2.255 | 2039 | |
| 40 | Cristián Contreras | 2.256 | 2036 | |
| 41 | Manuel Muñóz# | 2.263 | 2038 | |
| 42 | Eduardo Romano | 2.272 | 2018 | |
| 43 | Arturo Luna# | 2.274 | 2038 | |
| 43 | Francisco Aguilar# | 2.274 | 2036 | |
| 43 | Pedro Salas | 2.274 | 2026 | |
| 46 | Arturo Luna# | 2.276 | 2036 | |
| 47 | Ricardo Martínez | 2.280 | 2028 | |
| 47 | José Pérez# | 2.280 | 2039 | |
| 49 | Javier Aguilar | 2.282 | 2010 | |
| 50 | Félix Villalobas# | 2.288 | 2037 | |
| 51 | Valentim Ornelas | 2.289 | 2018 | |
| 52 | Eduardo Romano | 2.292 | 2016 | |
| 53 | Héctor Pérez | 2.297 | 2024 | |
| 54 | Harry Sullivan | 2.299 | 2011 | |
| 55 | Manuel Ramírez | 2.302 | 2011 | |
| 56 | Alberto Guerra# | 2.308 | 2038 | |
| 57 | Edgardo Flores# | 2.311 | 2038 | |
| 58 | Pedro Barrón | 2.313 | 2007 | |
| 59 | Alfredo Gonzáles# | 2.325 | 2030 | |
| 60 | Jorge Ruíz | 2.334 | 2017 | |
| 61 | David Hernández | 2.337 | 2011 | |
| 62 | Héctor Rivera# | 2.365 | 2038 | |
| 62 | Toshiki Harada | 2.365 | 2010 | |
| 64 | Rafael Ramírez | 2.367 | 2022 | |
| 65 | Manuel Sánchez# | 2.369 | 2037 | |
| 66 | Manuel Ramírez | 2.372 | 2013 | |
| 67 | Carlos Domínguez# | 2.375 | 2033 | |
| 67 | Santiago Benítez# | 2.375 | 2036 | |
| 69 | António Flores# | 2.392 | 2038 | |
| 70 | Santiago Benítez# | 2.397 | 2037 | |
| 71 | Edgardo Flores# | 2.407 | 2036 | |
| 72 | Rubén Mejía# | 2.408 | 2036 | |
| 73 | Israel Villarreal | 2.410 | 2011 | |
| 73 | Jorge Ruíz | 2.410 | 2025 | |
| 75 | Armando Valdéz# | 2.418 | 2038 | |
| 75 | Carlos Flores# | 2.418 | 2037 | |
| 77 | Gerardo Díaz# | 2.423 | 2037 | |
| 78 | Jorge Amézaga# | 2.428 | 2038 | |
| 79 | António Flores# | 2.429 | 2030 | |
| 80 | Fernando Ríos | 2.433 | 2021 | |
| 81 | Lúcio Saldaña# | 2.449 | 2028 | |
| 82 | José Bernal# | 2.450 | 2039 | |
| 83 | Ralph Dean | 2.455 | 2010 | |
| 84 | Félix Villalobas# | 2.460 | 2034 | |
| 84 | Preston Bell | 2.460 | 2021 | |
| 86 | António Soto# | 2.469 | 2038 | |
| 87 | Santiago Benítez# | 2.473 | 2039 | |
| 88 | Pedro Chávez | 2.479 | 2016 | |
| 89 | Alberto Guerra# | 2.481 | 2031 | |
| 90 | Pedro Ramírez# | 2.484 | 2033 | |
| 91 | Jorge Ruíz | 2.486 | 2021 | |
| 92 | Alberto Guerra# | 2.493 | 2039 | |
| 93 | Luis Mendoza# | 2.497 | 2037 | |
| 93 | Kantaro Sakei | 2.497 | 2011 | |
| 95 | Ramón Villalobos# | 2.499 | 2031 | |
| 96 | Jorge Ruíz | 2.513 | 2023 | |
| 97 | Álex Martínez | 2.515 | 2012 | |
| 98 | Gary Fisher | 2.521 | 2010 | |
| 98 | Diego Quiñones# | 2.521 | 2038 | |
| 100 | Manny Flores# | 2.524 | 2036 |
