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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Javier Rodríguez | 0.293 | 2007 | |
| 2 | Josh Ewing | 0.377 | 2028 | |
| 3 | James Horton# | 0.560 | 2045 | |
| 4 | Ramiro Piña | 0.637 | 2020 | |
| 5 | Augusto Salazar# | 0.684 | 2043 | |
| 6 | Elmer Bolick# | 0.692 | 2046 | |
| 7 | Eric Sullivan# | 0.758 | 2045 | |
| 8 | Matt Parker | 0.798 | 2022 | |
| 9 | Ray Reyes | 0.835 | 2028 | |
| 10 | P.J. Miller# | 0.839 | 2047 | |
| 11 | Luis Cortéz | 0.840 | 2018 | |
| 12 | Armand Calazzo | 0.848 | 2020 | |
| 13 | Tom England# | 0.909 | 2037 | |
| 14 | Ramiro Piña | 0.931 | 2018 | |
| 14 | Júlio Rosa | 0.931 | 2011 | |
| 16 | Manny Campos | 0.950 | 2027 | |
| 17 | Don Wiggins | 0.956 | 2022 | |
| 18 | Nick Washington# | 0.969 | 2038 | |
| 19 | Christian Livingston | 0.974 | 2011 | |
| 20 | Willie St. John | 1.000 | 2020 | |
| 21 | Jaime Espinoza | 1.008 | 2021 | |
| 22 | Bill Cashman# | 1.019 | 2046 | |
| 23 | Jerry Martin | 1.038 | 2024 | |
| 24 | Anderson Jackson | 1.044 | 2028 | |
| 25 | Miguel Meneces | 1.068 | 2027 | |
| 26 | Arthur Green | 1.093 | 2020 | |
| 27 | Alberto Márquez | 1.095 | 2019 | |
| 28 | Derrick Stafford# | 1.099 | 2043 | |
| 29 | Paul Lorenzo | 1.102 | 2025 | |
| 30 | Jorge Vásquez | 1.108 | 2008 | |
| 31 | Miguel Ramírez | 1.120 | 2012 | |
| 32 | George McLeod# | 1.137 | 2047 | |
| 33 | Joe Matthews | 1.168 | 2010 | |
| 34 | Jonathan Booker | 1.184 | 2014 | |
| 35 | António López | 1.185 | 2010 | |
| 36 | Holden Leonard# | 1.193 | 2046 | |
| 37 | Ron Hannah | 1.196 | 2027 | |
| 38 | Stephen Warner# | 1.221 | 2041 | |
| 39 | Greg Gardyne# | 1.222 | 2044 | |
| 40 | Keith Jennings | 1.227 | 2021 | |
| 41 | Todd Howell | 1.241 | 2016 | |
| 42 | Lúcio Estrada | 1.256 | 2027 | |
| 42 | Mike O'Neal# | 1.256 | 2049 | |
| 44 | Jaime Espinoza | 1.259 | 2020 | |
| 45 | Bernard Cháves# | 1.268 | 2045 | |
| 46 | Justin Hubbard# | 1.281 | 2043 | |
| 47 | Chad Freeman# | 1.293 | 2045 | |
| 48 | António Alvarado | 1.298 | 2012 | |
| 49 | António Sánchez | 1.314 | 2017 | |
| 50 | Robert Davis# | 1.326 | 2047 | |
| 51 | Brian Abbott | 1.328 | 2036 | |
| 52 | Alex Peters# | 1.337 | 2048 | |
| 53 | Harry Robinson | 1.343 | 2028 | |
| 54 | Paul McClure# | 1.344 | 2043 | |
| 55 | Scott Davis | 1.373 | 2026 | |
| 56 | Marcos Urbina | 1.375 | 2011 | |
| 57 | Vince Peters# | 1.379 | 2042 | |
| 58 | Matt MacKinley | 1.385 | 2031 | |
| 59 | Scott Davis | 1.389 | 2025 | |
| 60 | Steve Haynes | 1.391 | 2010 | |
| 61 | Cho-yeong Cho | 1.392 | 2009 | |
| 61 | Álex Villegas | 1.392 | 2020 | |
| 63 | Diego Chávez | 1.394 | 2011 | |
| 63 | Shinji Matsuda# | 1.394 | 2049 | |
| 65 | Bernardo López# | 1.397 | 2048 | |
| 65 | Ron Hannah | 1.397 | 2026 | |
| 67 | Vicente Durán | 1.401 | 2020 | |
| 68 | Alfonso Gutiérrez | 1.414 | 2010 | |
| 68 | Horace Thomas | 1.414 | 2009 | |
| 70 | John Kelly | 1.421 | 2025 | |
| 71 | Bill Cunningham# | 1.427 | 2046 | |
| 72 | Armando Pérez | 1.428 | 2015 | |
| 73 | Howard Green | 1.429 | 2014 | |
| 74 | Larry Jackson# | 1.434 | 2043 | |
| 75 | Carlos Tavárez | 1.435 | 2020 | |
| 76 | Dustin Velásquez | 1.436 | 2029 | |
| 77 | Fred Henderson# | 1.438 | 2047 | |
| 77 | Nathan Walters | 1.438 | 2022 | |
| 77 | Tommy Smith | 1.438 | 2007 | |
| 80 | Michael Swanson# | 1.440 | 2040 | |
| 81 | Ron Chapman | 1.446 | 2019 | |
| 82 | Tim Sanders | 1.452 | 2028 | |
| 83 | Joey Smith | 1.456 | 2007 | |
| 84 | Alfredo Montalvo | 1.459 | 2022 | |
| 84 | Alfonso Gutiérrez | 1.459 | 2008 | |
| 84 | Dionisio Penni | 1.459 | 2019 | |
| 87 | Ben Moody | 1.466 | 2020 | |
| 87 | Darren Blackwell | 1.466 | 2022 | |
| 89 | Manny Velásquez | 1.469 | 2014 | |
| 90 | Arthur Green | 1.470 | 2019 | |
| 91 | Tony Meyer | 1.473 | 2024 | |
| 92 | Albert Soto# | 1.479 | 2047 | |
| 93 | António Meléndez# | 1.484 | 2049 | |
| 94 | Jason Drake | 1.486 | 2018 | |
| 95 | Stanley Kerwin# | 1.492 | 2035 | |
| 96 | Esteban Gonzáles | 1.500 | 2014 | |
| 97 | Adam Schulte# | 1.506 | 2047 | |
| 97 | Jesse Green | 1.506 | 2014 | |
| 99 | Manuel González | 1.507 | 2025 | |
| 100 | Alex Stanford | 1.517 | 2022 |
