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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Carlos Ruíz# | 0.377 | 2012 | |
| 2 | Luis Fuentes# | 0.675 | 2012 | |
| 3 | David Lawson# | 0.761 | 2015 | |
| 4 | Tim Walker# | 1.049 | 2017 | |
| 5 | Edmond King# | 1.227 | 2014 | |
| 6 | Tom O'Day# | 1.262 | 2013 | |
| 7 | Tom O'Day# | 1.344 | 2014 | |
| 8 | Ramón Castaneda# | 1.357 | 2012 | |
| 9 | Ed Armstrong# | 1.362 | 2016 | |
| 10 | John Slater# | 1.414 | 2017 | |
| 11 | Carlos Ruíz# | 1.421 | 2014 | |
| 11 | Jonathan Clark# | 1.421 | 2015 | |
| 11 | Michael Burton# | 1.421 | 2015 | |
| 14 | José Contreras# | 1.436 | 2013 | |
| 15 | John Grubb# | 1.485 | 2012 | |
| 16 | José Delgado# | 1.508 | 2013 | |
| 16 | Steve Garrett# | 1.508 | 2013 | |
| 18 | Bruce Lowe# | 1.533 | 2016 | |
| 19 | Rod Crowe# | 1.558 | 2016 | |
| 20 | António Navarro# | 1.574 | 2016 | |
| 21 | James Phillips# | 1.646 | 2013 | |
| 22 | Ray Thompson# | 1.688 | 2013 | |
| 23 | Rob Young# | 1.695 | 2014 | |
| 24 | Bill Baker# | 1.712 | 2013 | |
| 25 | Robert Osborne# | 1.778 | 2013 | |
| 25 | Jack Beard# | 1.778 | 2013 | |
| 27 | Carlos Ruíz# | 1.808 | 2015 | |
| 28 | Johnny Jacobs# | 1.809 | 2015 | |
| 29 | Cohen Brouillette# | 1.841 | 2012 | |
| 30 | Matt McGill# | 1.870 | 2014 | |
| 31 | Bill Baker# | 1.873 | 2014 | |
| 32 | Richard Rogers# | 1.877 | 2016 | |
| 33 | Pancho Romero# | 1.878 | 2013 | |
| 34 | Ray Weeks# | 1.919 | 2016 | |
| 35 | Juan Mendoza# | 1.961 | 2012 | |
| 36 | Ramón Vázquez# | 1.964 | 2013 | |
| 37 | Howard Poole# | 1.966 | 2017 | |
| 38 | Steve Garrett# | 1.976 | 2014 | |
| 39 | William Howard# | 1.991 | 2012 | |
| 40 | Scott Roberts# | 2.025 | 2017 | |
| 41 | Bruce Wall# | 2.028 | 2016 | |
| 42 | Bob Hill# | 2.033 | 2016 | |
| 43 | Rob Young# | 2.038 | 2012 | |
| 44 | Adrián Orozco# | 2.043 | 2013 | |
| 45 | Ramón Vázquez# | 2.047 | 2014 | |
| 46 | Buddy Wills# | 2.057 | 2013 | |
| 47 | Billy Collins# | 2.066 | 2015 | |
| 48 | Lorenzo Pueblo# | 2.068 | 2013 | |
| 49 | Troy Davis# | 2.077 | 2016 | |
| 49 | Ben Savage# | 2.077 | 2016 | |
| 49 | Jeffrey Allison# | 2.077 | 2016 | |
| 52 | Jordan Norwood# | 2.106 | 2012 | |
| 53 | Joël Mastroianni# | 2.111 | 2012 | |
| 54 | John Slater# | 2.118 | 2016 | |
| 55 | Reid Harrell# | 2.124 | 2013 | |
| 56 | Félix Ortíz# | 2.139 | 2013 | |
| 57 | Tommy Simmons# | 2.167 | 2014 | |
| 58 | Roger Marshall# | 2.177 | 2012 | |
| 59 | Ramón Vázquez# | 2.186 | 2012 | |
| 60 | Brian Wallace# | 2.194 | 2016 | |
| 61 | Doug Walsh# | 2.196 | 2012 | |
| 62 | Woody Williams# | 2.199 | 2014 | |
| 63 | Miguel Tovar# | 2.207 | 2016 | |
| 63 | Eric Edwards# | 2.207 | 2017 | |
| 65 | Bob Moore# | 2.222 | 2013 | |
| 66 | Tim Fowler# | 2.234 | 2012 | |
| 67 | John Jones# | 2.236 | 2012 | |
| 68 | John Cannon# | 2.250 | 2014 | |
| 68 | Richard Rogers# | 2.250 | 2012 | |
| 68 | Richard Stevenson# | 2.250 | 2012 | |
| 71 | Kevin Landry# | 2.261 | 2013 | |
| 72 | J.R. Murphy# | 2.263 | 2014 | |
| 73 | Yasujiro Ono# | 2.264 | 2014 | |
| 74 | John Jones# | 2.275 | 2016 | |
| 75 | Edmond King# | 2.284 | 2013 | |
| 76 | Vaughn Lewis# | 2.288 | 2013 | |
| 77 | Henry McGowan# | 2.298 | 2012 | |
| 77 | Tommy Bartlett# | 2.298 | 2017 | |
| 79 | Ruberto Laranjeira# | 2.307 | 2017 | |
| 80 | Brian Travis# | 2.319 | 2017 | |
| 81 | Paul Johnston# | 2.324 | 2012 | |
| 82 | Bill Dillard# | 2.325 | 2016 | |
| 83 | Luis Fuentes# | 2.341 | 2013 | |
| 84 | Ben Phipps | 2.342 | 2013 | |
| 84 | John Slater# | 2.342 | 2015 | |
| 86 | John Stroud# | 2.348 | 2017 | |
| 87 | Lance Harmon# | 2.368 | 2012 | |
| 88 | Bryan Peterson# | 2.394 | 2015 | |
| 89 | Trip Finch# | 2.400 | 2013 | |
| 89 | Donald Hoover# | 2.400 | 2015 | |
| 91 | Carlos Díaz# | 2.403 | 2015 | |
| 92 | José Delgado# | 2.408 | 2015 | |
| 93 | Jon Morris# | 2.418 | 2015 | |
| 94 | Aaron Taylor# | 2.431 | 2015 | |
| 95 | Aaron Taylor# | 2.442 | 2014 | |
| 96 | Ben Bryant# | 2.455 | 2016 | |
| 96 | Curt Rhodes# | 2.455 | 2014 | |
| 96 | John Jones# | 2.455 | 2014 | |
| 99 | Ed Armstrong# | 2.467 | 2017 | |
| 100 | Jonathan Martin# | 2.488 | 2012 |
