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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Manny Velásquez | 1.941 | 2011-2014 | |
| 2 | Stan Stewart | 2.512 | 2012-2015 | |
| 3 | José Rojas | 2.598 | 2014-2017 | |
| 4 | Tim Harmon | 2.614 | 2011-2014 | |
| 5 | Miguel Archuleta | 2.667 | 2014-2017 | |
| 6 | Esteban Baca | 2.882 | 2014-2017 | |
| 7 | Martín Lópes | 2.911 | 2007-2011 | |
| 8 | Michael Hoffmeyer | 2.943 | 2008-2011 | |
| 9 | Jung Chwa | 2.957 | 2014-2017 | |
| 10 | Brian O'Tormey | 2.984 | 2007-2011 | |
| 11 | Jesse Green | 3.092 | 2012-2015 | |
| 12 | Octávio Garza | 3.234 | 2008-2011 | |
| 13 | António Gálvez | 3.649 | 2007-2011 | |
| 14 | Carlos Guillén# | 4.147 | 2040-2044 | |
| 15 | Javier Encarnación | 4.735 | 2007-2010 |
