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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Jeremy Gutiérrez# | 4.150 | 2017-2019 | |
| 2 | Raúl Areola# | 4.663 | 2018-2019 | |
| 3 | Stanley Neal# | 4.960 | 2018-2019 | |
| 4 | Marcelino Freschi# | 5.057 | 2017-2019 | |
| 5 | Bob Meyer# | 5.133 | 2016-2019 | |
| 6 | Mike Hornberger# | 5.291 | 2017-2018 | |
| 7 | William Taylor# | 5.501 | 2015-2019 | |
| 8 | Robert Archer# | 5.533 | 2016-2018 | |
| 9 | Rod Bakewell# | 5.565 | 2017-2019 | |
| 10 | Christian Patrick# | 5.608 | 2017-2018 | |
| 11 | Carl Dyess# | 5.633 | 2015-2016 | |
| 12 | Felipe Gutiérrez# | 5.733 | 2016-2019 | |
| 13 | Paco López# | 5.757 | 2017-2019 | |
| 14 | Max Moore# | 5.790 | 2015-2016 | |
| 15 | Fernando Reyna# | 5.800 | 2017-2019 | |
| 16 | Juan Correa# | 5.854 | 2017-2019 | |
| 17 | Jorge Moreno# | 5.872 | 2015-2016 | |
| 18 | Stuart Lee# | 5.956 | 2015-2016 | |
| 19 | Lee Branch# | 5.971 | 2018-2019 | |
| 20 | Han-seung Kim# | 5.994 | 2018-2019 | |
| 21 | Benjamin Brouwer# | 6.047 | 2017-2019 | |
| 22 | Tony Madden# | 6.049 | 2015-2019 | |
| 23 | Manuel Delgado# | 6.076 | 2017-2019 | |
| 24 | Stanley Anderson# | 6.170 | 2018-2019 | |
| 25 | Jason Jackson# | 6.224 | 2017-2018 | |
| 26 | Ángelo Cabrera# | 6.234 | 2017-2019 | |
| 27 | Casey Bader# | 6.363 | 2015-2016 | |
| 28 | Mitch Bowman# | 6.382 | 2016-2019 | |
| 29 | Waylon Anderson# | 6.689 | 2015-2019 | |
| 30 | Alfredo Ríos# | 6.779 | 2017-2018 | |
| 31 | Manuel Martínez# | 6.801 | 2017-2019 | |
| 32 | Dusty Muhidini# | 6.827 | 2015-2018 | |
| 33 | Jim Johnstone# | 7.143 | 2017-2019 | |
| 34 | Benjamin Baars# | 7.157 | 2017-2019 | |
| 35 | Eric Lang# | 7.431 | 2017-2019 | |
| 36 | David Auchinleck# | 7.594 | 2015-2019 | |
| 37 | Dusty Mueller# | 8.232 | 2015-2016 |
