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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 | Ed Armstrong# | 0.747 | 2018 | |
| 4 | David Lawson# | 0.761 | 2015 | |
| 5 | Tim Walker# | 1.049 | 2017 | |
| 6 | Dave Murphy# | 1.085 | 2018 | |
| 7 | Ray Weeks# | 1.227 | 2019 | |
| 7 | Edmond King | 1.227 | 2014 | |
| 9 | Juan Mendoza# | 1.246 | 2019 | |
| 10 | Tom O'Day# | 1.262 | 2013 | |
| 11 | Orlando Días# | 1.299 | 2019 | |
| 12 | Tom O'Day# | 1.344 | 2014 | |
| 13 | Ed Armstrong# | 1.357 | 2019 | |
| 13 | Ramón Castaneda# | 1.357 | 2012 | |
| 15 | Ed Armstrong# | 1.362 | 2016 | |
| 16 | Wilbert Hill# | 1.385 | 2019 | |
| 17 | John Slater# | 1.414 | 2017 | |
| 18 | Carlos Ruíz# | 1.421 | 2014 | |
| 18 | Jonathan Clark# | 1.421 | 2015 | |
| 18 | Michael Burton# | 1.421 | 2015 | |
| 21 | José Contreras# | 1.436 | 2013 | |
| 22 | Eliot Moreau# | 1.463 | 2019 | |
| 23 | John Grubb# | 1.485 | 2012 | |
| 24 | José Delgado# | 1.508 | 2013 | |
| 24 | Steve Garrett# | 1.508 | 2013 | |
| 26 | Bruce Lowe# | 1.533 | 2016 | |
| 27 | George Bedford# | 1.536 | 2019 | |
| 28 | Rod Crowe# | 1.558 | 2016 | |
| 29 | António Navarro# | 1.574 | 2016 | |
| 30 | James Phillips# | 1.646 | 2013 | |
| 31 | Ray Thompson# | 1.688 | 2013 | |
| 32 | Rob Young# | 1.695 | 2014 | |
| 33 | Juan Mendoza# | 1.712 | 2018 | |
| 33 | Bill Baker# | 1.712 | 2013 | |
| 35 | Manuel García# | 1.737 | 2018 | |
| 36 | Daryl Feaviour# | 1.747 | 2019 | |
| 37 | Robert Osborne# | 1.778 | 2013 | |
| 37 | Jack Beard# | 1.778 | 2013 | |
| 39 | Carlos Ruíz# | 1.808 | 2015 | |
| 40 | Johnny Jacobs# | 1.809 | 2015 | |
| 41 | Hugh Martin# | 1.811 | 2018 | |
| 42 | Cohen Brouillette# | 1.841 | 2012 | |
| 43 | Howard Poole# | 1.862 | 2018 | |
| 44 | Matt McGill# | 1.870 | 2014 | |
| 45 | Bill Baker# | 1.873 | 2014 | |
| 46 | Richard Rogers# | 1.877 | 2016 | |
| 47 | Pancho Romero# | 1.878 | 2013 | |
| 48 | Keith Rogers# | 1.881 | 2019 | |
| 49 | Oliver Romero# | 1.889 | 2019 | |
| 50 | Millard Mason# | 1.895 | 2019 | |
| 51 | Alexander González# | 1.900 | 2019 | |
| 52 | Ray Weeks# | 1.919 | 2016 | |
| 53 | Jorge López# | 1.929 | 2018 | |
| 54 | Hugh Martin# | 1.939 | 2019 | |
| 55 | Juan Mendoza# | 1.961 | 2012 | |
| 56 | Ramón Vázquez# | 1.964 | 2013 | |
| 57 | Howard Poole# | 1.966 | 2017 | |
| 58 | Steve Garrett# | 1.976 | 2014 | |
| 59 | William Howard# | 1.991 | 2012 | |
| 60 | Dave Murphy# | 2.009 | 2019 | |
| 61 | Scott Roberts# | 2.025 | 2017 | |
| 62 | Bruce Wall# | 2.028 | 2016 | |
| 63 | John Stroud# | 2.032 | 2019 | |
| 64 | Bob Hill# | 2.033 | 2016 | |
| 65 | Rob Young# | 2.038 | 2012 | |
| 66 | Adrián Orozco# | 2.043 | 2013 | |
| 67 | Ramón Vázquez# | 2.047 | 2014 | |
| 68 | Buddy Wills# | 2.057 | 2013 | |
| 69 | Billy Collins# | 2.066 | 2015 | |
| 70 | Eliot Moreau# | 2.068 | 2018 | |
| 70 | Lorenzo Pueblo# | 2.068 | 2013 | |
| 72 | Troy Davis# | 2.077 | 2016 | |
| 72 | Jeffrey Allison# | 2.077 | 2016 | |
| 72 | Ben Savage# | 2.077 | 2016 | |
| 75 | Jordan Norwood# | 2.106 | 2012 | |
| 76 | Joël Mastroianni# | 2.111 | 2012 | |
| 77 | John Slater# | 2.118 | 2016 | |
| 78 | Reid Harrell# | 2.124 | 2013 | |
| 79 | Tim Walker# | 2.132 | 2018 | |
| 80 | Félix Ortíz# | 2.139 | 2013 | |
| 81 | Tomás Bravo# | 2.140 | 2019 | |
| 82 | Tommy Simmons# | 2.167 | 2014 | |
| 83 | Pancho Flores# | 2.177 | 2019 | |
| 83 | Roger Marshall# | 2.177 | 2012 | |
| 85 | Ramón Vázquez# | 2.186 | 2012 | |
| 86 | Brian Wallace# | 2.194 | 2016 | |
| 86 | Arturo Salinas# | 2.194 | 2019 | |
| 88 | Doug Walsh# | 2.196 | 2012 | |
| 89 | Woody Williams# | 2.199 | 2014 | |
| 90 | Eric Edwards# | 2.207 | 2017 | |
| 90 | Miguel Tovar# | 2.207 | 2016 | |
| 92 | Paul Wise# | 2.209 | 2019 | |
| 93 | Bob Moore# | 2.222 | 2013 | |
| 94 | Will Caron# | 2.224 | 2018 | |
| 95 | Tim Fowler# | 2.234 | 2012 | |
| 96 | John Jones# | 2.236 | 2012 | |
| 97 | Manuel García# | 2.238 | 2019 | |
| 97 | Howard Poole# | 2.238 | 2019 | |
| 99 | Richard Rogers# | 2.250 | 2012 | |
| 99 | Richard Stevenson# | 2.250 | 2012 |
