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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Rich Bussell# | 1.857 | 2012 | |
| 2 | Maurice Gould# | 2.066 | 2015 | |
| 3 | Maurice Gould# | 2.233 | 2012 | |
| 4 | Kent Rose# | 2.344 | 2012 | |
| 5 | Maurice Gould# | 2.349 | 2013 | |
| 6 | Roberto Martínez# | 2.366 | 2012 | |
| 7 | Jake Nelson# | 2.412 | 2016 | |
| 8 | Manuel Ruíz# | 2.424 | 2012 | |
| 9 | Scott Wilson# | 2.435 | 2015 | |
| 10 | Roberto Martínez# | 2.592 | 2013 | |
| 11 | Anthony Atkinson# | 2.608 | 2015 | |
| 12 | Maurice Gould# | 2.656 | 2017 | |
| 13 | Domingo Rivera# | 2.684 | 2012 | |
| 14 | Paul Johnston# | 2.717 | 2017 | |
| 15 | Evan Warner# | 2.731 | 2012 | |
| 16 | Manuel Ruíz# | 2.810 | 2013 | |
| 17 | Dave Nicholson# | 2.817 | 2013 | |
| 18 | Raúl Pérez# | 2.844 | 2014 | |
| 19 | King Crawford | 2.896 | 2012 | |
| 20 | Pat Sellers | 2.903 | 2014 | |
| 21 | Cohen Brouillette# | 2.907 | 2016 | |
| 22 | Bob Lee# | 2.914 | 2012 | |
| 23 | Evan Warner# | 2.945 | 2013 | |
| 24 | Ángel Galindo# | 2.949 | 2013 | |
| 24 | Jim Fleming# | 2.949 | 2015 | |
| 26 | Adam Thomas# | 2.963 | 2012 | |
| 27 | Norm Jackson# | 2.974 | 2012 | |
| 28 | Manuel Ruíz# | 3.039 | 2014 | |
| 29 | Adam Thomas# | 3.043 | 2013 | |
| 30 | Ray Lester# | 3.051 | 2012 | |
| 30 | Ray Larson# | 3.051 | 2012 | |
| 32 | António Gómez# | 3.059 | 2015 | |
| 33 | Nathan Wilson# | 3.071 | 2016 | |
| 34 | António Gómez# | 3.080 | 2013 | |
| 35 | Anthony Atkinson# | 3.083 | 2016 | |
| 35 | Raúl Pérez# | 3.083 | 2012 | |
| 37 | Scott Wilson# | 3.115 | 2016 | |
| 38 | Charles Luce# | 3.123 | 2013 | |
| 39 | Ray Larson# | 3.125 | 2014 | |
| 40 | Alberto Pantoja# | 3.126 | 2014 | |
| 41 | Raúl Pérez# | 3.141 | 2013 | |
| 42 | Wilfred Brooks# | 3.144 | 2014 | |
| 43 | Arthur Gardner# | 3.154 | 2012 | |
| 44 | Maurice Gould# | 3.179 | 2016 | |
| 45 | Maurice Gould# | 3.195 | 2014 | |
| 46 | Adrien Clément# | 3.202 | 2016 | |
| 47 | Tom Owens# | 3.221 | 2015 | |
| 48 | Guillermo Martínez | 3.225 | 2012 | |
| 49 | Charles Luce# | 3.230 | 2014 | |
| 50 | António Gómez# | 3.240 | 2012 | |
| 51 | Royce Butterfield# | 3.276 | 2013 | |
| 52 | António Gómez# | 3.299 | 2014 | |
| 52 | Alberto Pantoja# | 3.299 | 2013 | |
| 54 | Rich Bussell# | 3.305 | 2013 | |
| 55 | Rafael López# | 3.313 | 2014 | |
| 56 | Ron Hodges# | 3.319 | 2017 | |
| 57 | Jeremy Rogers# | 3.343 | 2013 | |
| 58 | Juan Fernández# | 3.347 | 2012 | |
| 59 | Rafael López# | 3.351 | 2013 | |
| 60 | Adam Thomas# | 3.369 | 2016 | |
| 61 | Tom Owens# | 3.375 | 2013 | |
| 62 | José Serrano# | 3.386 | 2016 | |
| 63 | Aurelio Ramírez# | 3.389 | 2013 | |
| 64 | Tom Owens# | 3.393 | 2016 | |
| 65 | Nathan Wilson# | 3.394 | 2015 | |
| 66 | Kevin Sampson# | 3.396 | 2016 | |
| 67 | Derrick Scott# | 3.399 | 2015 | |
| 68 | Jake Nelson# | 3.417 | 2015 | |
| 69 | Tsukasa Yamanoue# | 3.439 | 2016 | |
| 70 | Rich Bussell# | 3.454 | 2014 | |
| 71 | Kinnosuke Sato# | 3.455 | 2017 | |
| 72 | Roberto Martínez# | 3.488 | 2017 | |
| 72 | Bob Rudyard | 3.488 | 2012 | |
| 74 | Dave Krause | 3.507 | 2012 | |
| 75 | Bob Smith# | 3.541 | 2016 | |
| 76 | Robert Cates# | 3.542 | 2013 | |
| 77 | Nolan Lyons# | 3.546 | 2014 | |
| 78 | Norm Jackson# | 3.554 | 2015 | |
| 79 | Jim Brady# | 3.557 | 2015 | |
| 80 | Raúl Pérez# | 3.558 | 2015 | |
| 81 | Bob Williams# | 3.559 | 2015 | |
| 82 | Manuel Ruíz# | 3.576 | 2015 | |
| 82 | Nolan Lyons# | 3.576 | 2017 | |
| 84 | Royce Butterfield# | 3.603 | 2014 | |
| 85 | Adam Thomas# | 3.606 | 2015 | |
| 86 | Terence McKinley# | 3.616 | 2016 | |
| 86 | José Leal# | 3.616 | 2016 | |
| 88 | Wilfred Brooks# | 3.618 | 2013 | |
| 89 | Norm Jackson# | 3.620 | 2014 | |
| 90 | Charles Luce# | 3.622 | 2016 | |
| 91 | Peter Klein# | 3.644 | 2012 | |
| 92 | Rich Bussell# | 3.645 | 2017 | |
| 93 | Gabriel Gutiérrez# | 3.646 | 2015 | |
| 94 | Charles Bailey# | 3.648 | 2017 | |
| 95 | José Gallegos# | 3.662 | 2017 | |
| 96 | Paul Durden# | 3.669 | 2013 | |
| 97 | Thomas White | 3.684 | 2012 | |
| 98 | Tom Owens# | 3.688 | 2014 | |
| 99 | Jesse George# | 3.692 | 2012 | |
| 100 | Jorge Mendoza# | 3.696 | 2016 |
