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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Jorge Castillo# | 3.338 | 2019 | |
| 2 | Dave Conley# | 3.996 | 2017 | |
| 3 | Dave Goode# | 4.000 | 2018 | |
| 4 | Edison Larson# | 4.031 | 2019 | |
| 5 | Louis McDowell# | 4.050 | 2019 | |
| 6 | Dan Mitchell# | 4.273 | 2019 | |
| 7 | Stuart Lee# | 4.435 | 2017 | |
| 8 | Raúl Andrés# | 4.459 | 2018 | |
| 9 | Louis McDowell# | 4.488 | 2016 | |
| 10 | Bobby Martin | 4.556 | 2017 | |
| 11 | José Ramírez# | 4.569 | 2017 | |
| 12 | Júlio Palma# | 4.725 | 2019 | |
| 13 | Paul O'Callahan# | 4.742 | 2018 | |
| 14 | Herman Barnes# | 4.785 | 2019 | |
| 15 | Willie Cameron# | 4.792 | 2017 | |
| 16 | Doruk Oyan# | 4.813 | 2017 | |
| 16 | Doug Ryan# | 4.813 | 2017 | |
| 18 | Willie Cameron# | 4.821 | 2019 | |
| 19 | Curt Pennington# | 4.831 | 2019 | |
| 20 | César Arellano# | 4.928 | 2019 | |
| 21 | Francisco Chávez | 4.997 | 2018 | |
| 22 | Jon Wilson | 5.100 | 2016 | |
| 23 | Allen Wilson# | 5.105 | 2018 | |
| 24 | Melvin Lee# | 5.137 | 2017 | |
| 25 | Fraser Cuevas# | 5.147 | 2019 | |
| 26 | Harvey Richards# | 5.223 | 2018 | |
| 27 | Ben Smith# | 5.333 | 2019 | |
| 28 | Alex Sullivan# | 5.400 | 2017 | |
| 29 | Willie Cameron# | 5.447 | 2018 | |
| 30 | Owen Henderson# | 5.548 | 2016 | |
| 31 | Kevin Allen# | 5.561 | 2017 | |
| 32 | Morris Nicholson# | 5.575 | 2017 | |
| 33 | John Alvarado# | 5.589 | 2016 | |
| 34 | Hunter Durham | 5.602 | 2017 | |
| 35 | Francisco Hernández# | 5.628 | 2018 | |
| 36 | Ricardo Martínez# | 5.637 | 2018 | |
| 37 | Greg Beaver# | 5.668 | 2019 | |
| 38 | Tom Howard | 5.688 | 2017 | |
| 38 | Keith Blanton# | 5.688 | 2017 | |
| 40 | Thad Floyd# | 5.715 | 2018 | |
| 41 | Doruk Oyan# | 5.804 | 2016 | |
| 42 | David Collingwood# | 5.876 | 2019 | |
| 43 | Dalton García# | 5.882 | 2016 | |
| 44 | Karl Pratt# | 5.891 | 2016 | |
| 45 | Kyle Lockhart# | 5.929 | 2018 | |
| 46 | John Adams# | 6.007 | 2017 | |
| 47 | Greg Beaver# | 6.040 | 2018 | |
| 48 | Norm Burris# | 6.086 | 2018 | |
| 49 | Gary Jones# | 6.136 | 2018 | |
| 50 | Jason Hubbell# | 6.231 | 2018 | |
| 51 | Donald Hutchinson# | 6.241 | 2019 | |
| 52 | Jesús Espinoza# | 6.286 | 2017 | |
| 53 | Karl Pratt# | 6.387 | 2017 | |
| 54 | Sandro So Payo# | 6.426 | 2017 | |
| 55 | Dexter Charles# | 6.474 | 2018 | |
| 56 | Ed MacCeallaich# | 6.490 | 2019 | |
| 57 | Ron O'Slattery# | 6.498 | 2019 | |
| 58 | Dusty Mueller# | 6.502 | 2017 | |
| 59 | Dave Conley# | 6.535 | 2016 | |
| 60 | José Ramírez# | 6.545 | 2018 | |
| 61 | Bill Howard# | 6.580 | 2018 | |
| 62 | Jesús González# | 6.600 | 2016 | |
| 63 | Max Moore# | 6.674 | 2017 | |
| 64 | Gilberto Ibarra# | 6.684 | 2017 | |
| 65 | Melvin Lee# | 6.690 | 2015 | |
| 66 | Kirk Evans# | 6.836 | 2017 | |
| 67 | Tony Hernández# | 6.856 | 2017 | |
| 68 | Jorge Moreno# | 6.892 | 2017 | |
| 69 | Graham Wilson# | 6.975 | 2017 | |
| 70 | Gregory Gary# | 6.985 | 2019 | |
| 71 | Andrés Martínez# | 7.002 | 2018 | |
| 72 | Rudy Jenkins# | 7.086 | 2018 | |
| 73 | Howard Dale | 7.188 | 2017 | |
| 74 | Louis Webber# | 7.220 | 2019 | |
| 75 | Richard Meyer# | 7.370 | 2018 | |
| 76 | José Acevedo# | 7.495 | 2016 | |
| 77 | Richard Meyer# | 7.504 | 2019 | |
| 78 | Eduardo Capata# | 7.515 | 2019 | |
| 79 | Carl Dyess# | 7.639 | 2017 | |
| 80 | Paul Abbott# | 7.902 | 2017 | |
| 81 | Aurélien Godet# | 7.977 | 2018 | |
| 82 | Dave Conley# | 8.248 | 2018 | |
| 83 | Francisco Hernández# | 8.339 | 2017 |
