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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Richard Allison# | 3.633 | 2017 | |
| 2 | Chuck Steele# | 3.722 | 2017 | |
| 3 | Lance Hodges# | 3.933 | 2017 | |
| 4 | Jason McKinney# | 4.027 | 2016 | |
| 5 | Robert Murdock# | 4.064 | 2016 | |
| 6 | Jason McKinney# | 4.115 | 2015 | |
| 7 | Aaron Wise# | 4.715 | 2017 | |
| 8 | Harry Chipman | 4.721 | 2017 | |
| 9 | Joseph Reed# | 4.785 | 2016 | |
| 10 | Ron Barry# | 4.856 | 2015 | |
| 11 | Russ Rose# | 4.964 | 2017 | |
| 12 | Jason Jackson# | 4.983 | 2016 | |
| 13 | Calvin McVurie# | 5.088 | 2017 | |
| 14 | Huai-yu Kan# | 5.102 | 2017 | |
| 15 | Clifford Turner# | 5.155 | 2017 | |
| 16 | Wayne Downey# | 5.257 | 2015 | |
| 17 | Nicholas Wells# | 5.601 | 2017 | |
| 18 | Tom Gibbs# | 5.609 | 2015 | |
| 19 | Fernando González# | 5.620 | 2017 | |
| 20 | Brian Chandler# | 5.666 | 2017 | |
| 21 | Bartolomeu Lio# | 5.720 | 2017 | |
| 22 | Dave Ponsonby# | 5.749 | 2017 | |
| 23 | Félix Jiménez# | 5.790 | 2017 | |
| 24 | Júlio Hernández# | 5.795 | 2016 | |
| 25 | Huai-yu Kan# | 5.920 | 2016 | |
| 26 | Jorge Candelária | 6.048 | 2015 | |
| 27 | Jorge Torres# | 6.573 | 2016 | |
| 28 | Kevin Gardner | 6.900 | 2015 |
