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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Masu Wakabayashi | 1.223 | 2013 | |
| 2 | Enrique Reyes | 1.363 | 2008 | |
| 3 | Harry Mytton | 1.429 | 2011 | |
| 4 | Max Lang | 1.457 | 2011 | |
| 4 | Carlos Berru | 1.457 | 2013 | |
| 6 | Rich Townsley | 1.492 | 2023 | |
| 7 | Peter Austin | 1.611 | 2008 | |
| 8 | Gennarino Lucchetti | 1.627 | 2015 | |
| 9 | Davey Huckaby | 1.645 | 2012 | |
| 10 | Bartolo González | 1.653 | 2014 | |
| 11 | Raúl Durán | 1.664 | 2007 | |
| 12 | Jason Dodd | 1.666 | 2012 | |
| 13 | Matt Davenport | 1.755 | 2011 | |
| 14 | Jeff Sandusky# | 1.760 | 2027 | |
| 15 | Francisco Moreno | 1.811 | 2013 | |
| 16 | Miguel Torres | 1.814 | 2013 | |
| 17 | Ted Spears | 1.838 | 2008 | |
| 18 | Jason Dodd | 1.849 | 2011 | |
| 19 | Ramón Silva | 1.862 | 2013 | |
| 20 | Mark Newman | 1.895 | 2014 | |
| 21 | Luke Lewis | 1.898 | 2008 | |
| 22 | Ron Durkin# | 1.932 | 2033 | |
| 23 | Javier Romero | 1.943 | 2013 | |
| 24 | Stephen Parker | 1.957 | 2010 | |
| 25 | Joseph Prévost | 2.006 | 2007 | |
| 26 | Ramón Silva | 2.011 | 2015 | |
| 27 | Tomás Chávez | 2.054 | 2008 | |
| 28 | Chris Bullock | 2.066 | 2012 | |
| 29 | Chad Field | 2.069 | 2019 | |
| 30 | Ángel Rodríguez | 2.077 | 2011 | |
| 30 | Ricardo García | 2.077 | 2008 | |
| 32 | Gennarino Lucchetti | 2.093 | 2013 | |
| 33 | Jesús Escobedo# | 2.118 | 2033 | |
| 34 | Mathew Miller | 2.127 | 2011 | |
| 35 | John Martin | 2.144 | 2008 | |
| 36 | Rich Townsley | 2.153 | 2022 | |
| 37 | Pedro Oliveira | 2.171 | 2008 | |
| 38 | Teruo Sato | 2.177 | 2013 | |
| 39 | Manuel Medrano | 2.205 | 2011 | |
| 40 | Alphonse Chiaudani | 2.225 | 2011 | |
| 40 | Luis Valentín | 2.225 | 2013 | |
| 42 | Alfred Carty | 2.237 | 2009 | |
| 43 | Paco Rodríguez | 2.254 | 2008 | |
| 43 | Lorenzo López | 2.254 | 2014 | |
| 45 | Travis O'Rourke | 2.262 | 2007 | |
| 46 | Vinícius Itaquy | 2.295 | 2013 | |
| 47 | Walter Bamber* | 2.299 | 2009 | |
| 48 | Miguel Meneces# | 2.303 | 2029 | |
| 49 | Carl Henry | 2.321 | 2025 | |
| 50 | Akihisa Nishimura | 2.334 | 2015 | |
| 51 | Matthew Scott | 2.370 | 2024 | |
| 52 | Juan Salazar# | 2.379 | 2031 | |
| 53 | Osvaldo Cruz* | 2.386 | 2013 | |
| 54 | Marcos Flores | 2.393 | 2027 | |
| 55 | Brody James | 2.411 | 2013 | |
| 56 | Warren Piniella | 2.413 | 2009 | |
| 56 | Mike Kerr | 2.413 | 2008 | |
| 58 | Mike Kerr | 2.415 | 2009 | |
| 59 | Luis De Los Ángeles | 2.417 | 2023 | |
| 60 | Chris Young | 2.450 | 2008 | |
| 61 | Jeff Keys | 2.459 | 2010 | |
| 62 | Steve Emerson | 2.466 | 2007 | |
| 63 | Ricardo Gómes | 2.476 | 2009 | |
| 64 | Manny Gonzáles | 2.481 | 2007 | |
| 65 | Vinícius Itaquy | 2.491 | 2015 | |
| 66 | Ricardo Marino | 2.494 | 2024 | |
| 67 | Justin Short | 2.497 | 2026 | |
| 68 | Nolan Baker | 2.509 | 2019 | |
| 69 | Max Lang | 2.571 | 2017 | |
| 70 | Rob King | 2.590 | 2011 | |
| 71 | Dan Rogers | 2.631 | 2021 | |
| 71 | Chris King | 2.631 | 2010 | |
| 73 | Rodrigo Torres# | 2.650 | 2034 | |
| 74 | Neil Richardson | 2.670 | 2012 | |
| 75 | Pepe Rodríguez | 2.671 | 2007 | |
| 76 | Chris Bullock | 2.672 | 2011 | |
| 77 | Ricardo Marino | 2.700 | 2023 | |
| 78 | Charles Walters# | 2.708 | 2036 | |
| 79 | Jim Kennedy | 2.711 | 2011 | |
| 80 | Orlando Maldonado | 2.717 | 2011 | |
| 81 | Julián Veláquez | 2.727 | 2007 | |
| 82 | Akihisa Nishimura | 2.738 | 2016 | |
| 83 | Ramón Marerro | 2.744 | 2026 | |
| 84 | Juan Contreras | 2.745 | 2027 | |
| 85 | Randy Ellison | 2.759 | 2008 | |
| 86 | Pepe Fernández | 2.772 | 2015 | |
| 87 | Vinícius Itaquy | 2.801 | 2016 | |
| 88 | Ricardo Montero# | 2.804 | 2029 | |
| 89 | Flint Gray# | 2.842 | 2023 | |
| 90 | Denny Green | 2.854 | 2024 | |
| 91 | Roberto Matoza | 2.858 | 2018 | |
| 92 | Desi Horton | 2.859 | 2007 | |
| 93 | Rodrigo Torres# | 2.871 | 2035 | |
| 94 | Jesús Andrade | 2.879 | 2025 | |
| 95 | Li-xue Si-ma | 2.897 | 2015 | |
| 96 | Jorge Oliva | 2.901 | 2014 | |
| 97 | Davis Morgan# | 2.906 | 2033 | |
| 98 | Javier Encarnación | 2.918 | 2011 | |
| 99 | António Ruíz# | 2.920 | 2028 | |
| 100 | Iván Maldonado | 2.933 | 2028 |
