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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Dave Conley# | 3.996 | 2017 | |
| 2 | Louis McDowell# | 4.488 | 2016 | |
| 3 | Bobby Martin# | 4.556 | 2017 | |
| 4 | Willie Cameron# | 4.792 | 2017 | |
| 5 | Doruk Oyan# | 4.813 | 2017 | |
| 5 | Doug Ryan# | 4.813 | 2017 | |
| 7 | Jon Wilson | 5.100 | 2016 | |
| 8 | Melvin Lee# | 5.137 | 2017 | |
| 9 | Owen Henderson# | 5.548 | 2016 | |
| 10 | Kevin Allen# | 5.561 | 2017 | |
| 11 | Morris Nicholson# | 5.575 | 2017 | |
| 12 | Tom Howard | 5.688 | 2017 | |
| 13 | Dalton García# | 5.882 | 2016 | |
| 14 | John Adams# | 6.007 | 2017 | |
| 15 | Jesús Espinoza# | 6.286 | 2017 | |
| 16 | Karl Pratt# | 6.387 | 2017 | |
| 17 | Sandro So Payo# | 6.426 | 2017 | |
| 18 | Dusty Mueller# | 6.502 | 2017 | |
| 19 | Max Moore# | 6.674 | 2017 | |
| 20 | Kirk Evans# | 6.836 | 2017 | |
| 21 | Tony Hernández# | 6.856 | 2017 | |
| 22 | Jorge Moreno# | 6.892 | 2017 | |
| 23 | Graham Wilson# | 6.975 | 2017 | |
| 24 | Germán Bonilla# | 7.488 | 2017 |
