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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Harold Taylor# | 4.404 | 2016-2017 | |
| 2 | Dan Riggs# | 4.660 | 2015-2017 | |
| 3 | Bobby Martin# | 4.765 | 2016-2017 | |
| 4 | Victor Powell# | 5.016 | 2016-2017 | |
| 5 | Jon Wilson | 5.100 | 2016-2016 | |
| 6 | José Ramírez# | 5.170 | 2016-2017 | |
| 7 | Dave Conley# | 5.198 | 2015-2017 | |
| 8 | Doruk Oyan# | 5.220 | 2016-2017 | |
| 9 | Louis McDowell# | 5.265 | 2016-2017 | |
| 10 | Raúl Andrés# | 5.351 | 2016-2017 | |
| 11 | John Alvarado# | 5.427 | 2013-2016 | |
| 12 | Dalton García# | 5.507 | 2016-2017 | |
| 13 | Willie Cameron# | 5.529 | 2016-2017 | |
| 14 | Ricardo Martínez# | 5.531 | 2015-2016 | |
| 15 | Aurélien Godet# | 5.540 | 2015-2017 | |
| 16 | Hunter Durham# | 5.598 | 2016-2017 | |
| 17 | Owen Henderson# | 5.721 | 2015-2016 | |
| 18 | John Adams# | 5.872 | 2016-2017 | |
| 19 | Alex Sullivan# | 5.914 | 2016-2017 | |
| 20 | Karl Pratt# | 5.915 | 2013-2017 | |
| 21 | Doug Ryan# | 5.946 | 2016-2017 | |
| 22 | Morris Nicholson# | 6.064 | 2013-2017 | |
| 23 | Melvin Lee# | 6.159 | 2015-2017 | |
| 24 | Howard Dale# | 6.226 | 2016-2017 | |
| 25 | Kevin Allen# | 6.275 | 2015-2017 | |
| 26 | Jesús Espinoza# | 6.286 | 2017-2017 | |
| 27 | Tony Hernández# | 6.401 | 2016-2017 | |
| 28 | Sandro So Payo# | 6.426 | 2017-2017 | |
| 29 | Dusty Mueller# | 6.502 | 2017-2017 | |
| 30 | Jesús González# | 6.539 | 2013-2017 | |
| 31 | Max Moore# | 6.674 | 2017-2017 | |
| 32 | José Acevedo# | 6.740 | 2013-2017 | |
| 33 | Tom Howard | 6.831 | 2016-2017 | |
| 34 | Jorge Moreno# | 6.892 | 2017-2017 | |
| 35 | Graham Wilson# | 6.975 | 2017-2017 | |
| 36 | Victor Day# | 6.998 | 2015-2017 | |
| 37 | Kirk Evans# | 7.163 | 2016-2017 | |
| 38 | Greg Beaver# | 7.569 | 2016-2017 | |
| 39 | Francisco Hernández# | 7.596 | 2013-2017 | |
| 40 | Germán Bonilla# | 7.607 | 2016-2017 | |
| 41 | Enrique Rodríguez# | 8.025 | 2013-2016 |
