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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Jorge Chávez | 1.432 | 2009 | |
| 2 | Stephen Parker | 1.615 | 2009 | |
| 3 | Ramón Estrada | 1.785 | 2014 | |
| 4 | Paul Adams | 1.812 | 2008 | |
| 5 | Mike Skinner | 1.851 | 2015 | |
| 6 | Ramiro Jiménez | 1.931 | 2014 | |
| 7 | Lou Peterson | 2.028 | 2015 | |
| 8 | Carl Burns | 2.063 | 2008 | |
| 9 | Ramón Estrada | 2.074 | 2013 | |
| 10 | Carlos Morales | 2.083 | 2008 | |
| 11 | Steve Talley | 2.097 | 2011 | |
| 12 | Cho-yeong Cho | 2.103 | 2012 | |
| 13 | Mark Schroeder | 2.125 | 2015 | |
| 14 | Scot MacIntosh | 2.127 | 2023 | |
| 15 | Jorge Chávez | 2.166 | 2008 | |
| 16 | Armando Félix | 2.176 | 2009 | |
| 17 | Orlando Ojeda | 2.177 | 2015 | |
| 18 | Gerald Russell | 2.232 | 2011 | |
| 19 | Juan Ortíz# | 2.241 | 2038 | |
| 20 | Ghidewon Hassan | 2.246 | 2007 | |
| 21 | Tony Árias | 2.250 | 2014 | |
| 22 | Nathan Thornton | 2.291 | 2019 | |
| 22 | Zi-jun Chou | 2.291 | 2009 | |
| 24 | Ryosei Takeda | 2.299 | 2014 | |
| 25 | Pierre Dumont | 2.301 | 2015 | |
| 26 | Paul Terry# | 2.311 | 2042 | |
| 27 | António Ortíz | 2.355 | 2009 | |
| 28 | Pedro Torres | 2.367 | 2014 | |
| 29 | Ramón Marerro | 2.380 | 2027 | |
| 30 | António Galindo | 2.398 | 2017 | |
| 31 | Germán Huerta | 2.402 | 2008 | |
| 32 | José Castro | 2.435 | 2014 | |
| 33 | Sean Perry | 2.438 | 2026 | |
| 34 | Diego Delgado | 2.446 | 2008 | |
| 35 | Mario Chávez | 2.455 | 2018 | |
| 36 | Bennett O'Day | 2.491 | 2041 | |
| 37 | Porter Barrette | 2.492 | 2009 | |
| 38 | Mike Drader | 2.505 | 2014 | |
| 39 | Pedro Torres | 2.523 | 2015 | |
| 40 | Reginald Clay# | 2.526 | 2043 | |
| 41 | Pete Cook | 2.550 | 2021 | |
| 42 | Frank Davis | 2.566 | 2024 | |
| 43 | Scotty Johnson | 2.574 | 2022 | |
| 44 | Joe MacAslan# | 2.578 | 2035 | |
| 45 | Manuel Santiago | 2.591 | 2028 | |
| 46 | Júlio González | 2.607 | 2024 | |
| 47 | José Vargas | 2.620 | 2008 | |
| 47 | Armando Montalvo | 2.620 | 2009 | |
| 49 | Ramón Peña | 2.632 | 2012 | |
| 50 | José Quiñones | 2.635 | 2007 | |
| 50 | Alejandro Guzmán | 2.635 | 2028 | |
| 52 | José Cuellar | 2.651 | 2028 | |
| 53 | Ramiro Jiménez | 2.656 | 2013 | |
| 54 | Andy Gustafson | 2.662 | 2007 | |
| 55 | Ramón Méndez | 2.666 | 2009 | |
| 56 | Terry Fields | 2.668 | 2023 | |
| 57 | Pedro Santiago | 2.676 | 2027 | |
| 58 | Wilson Pérez | 2.685 | 2009 | |
| 59 | Ryosei Takeda | 2.700 | 2017 | |
| 60 | António Elías | 2.705 | 2008 | |
| 60 | Pedro Castillo | 2.705 | 2011 | |
| 62 | Doug Lee# | 2.722 | 2043 | |
| 62 | Joe Matthews | 2.722 | 2012 | |
| 64 | Carlos Rodríguez | 2.734 | 2008 | |
| 65 | David González | 2.767 | 2007 | |
| 66 | Joe Manley | 2.773 | 2037 | |
| 67 | Bill Carver | 2.775 | 2037 | |
| 68 | Javier Moreno | 2.777 | 2028 | |
| 69 | José Zamora | 2.782 | 2014 | |
| 70 | Austin McIntosh# | 2.809 | 2043 | |
| 71 | Robinson Ramírez | 2.831 | 2029 | |
| 72 | Ron Bartlett | 2.856 | 2026 | |
| 73 | José Vargas | 2.858 | 2009 | |
| 74 | Justin Edwards | 2.860 | 2037 | |
| 75 | António Galindo | 2.866 | 2015 | |
| 76 | Tomás Fajardo | 2.868 | 2014 | |
| 77 | Dave Miller | 2.872 | 2023 | |
| 78 | Manuel Parra | 2.875 | 2015 | |
| 79 | Pedro Santiago | 2.878 | 2025 | |
| 80 | José Díaz | 2.885 | 2010 | |
| 81 | Stanley Briggs | 2.896 | 2021 | |
| 82 | Matt Hoffman | 2.902 | 2027 | |
| 82 | José Cardenas | 2.902 | 2008 | |
| 84 | Salvador Campos | 2.908 | 2010 | |
| 85 | Ryosei Takeda | 2.919 | 2015 | |
| 86 | Chris Walden | 2.927 | 2008 | |
| 87 | Clint Davis | 2.928 | 2008 | |
| 88 | David Garza | 2.933 | 2008 | |
| 89 | Tony Arthur | 2.951 | 2008 | |
| 90 | Joseph Reed# | 2.968 | 2040 | |
| 91 | Kip Manning | 2.970 | 2025 | |
| 92 | Jason Dodd | 2.972 | 2019 | |
| 93 | Jaime Morín | 2.983 | 2034 | |
| 94 | Dan Wright | 2.989 | 2012 | |
| 95 | Alejandro Méndez | 3.008 | 2016 | |
| 96 | Craig Jackson | 3.012 | 2012 | |
| 97 | Iván Costa# | 3.024 | 2044 | |
| 98 | Ken Lyons | 3.031 | 2023 | |
| 99 | Francisco Ríos | 3.037 | 2024 | |
| 100 | Alfredo Montalvo | 3.044 | 2024 |
