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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Richard Allison# | 3.633 | 2017-2017 | |
| 2 | Chuck Steele# | 3.722 | 2017-2017 | |
| 3 | Suezo Sato# | 3.827 | 2015-2017 | |
| 4 | Jason McKinney# | 3.866 | 2015-2017 | |
| 5 | Lance Hodges# | 3.939 | 2015-2017 | |
| 6 | John Jones# | 4.204 | 2015-2016 | |
| 7 | Ron Barry# | 4.325 | 2015-2017 | |
| 8 | Alec Pittman# | 4.380 | 2016-2017 | |
| 9 | Carl Snyder# | 4.424 | 2015-2017 | |
| 10 | Alf Näsbom# | 4.575 | 2015-2017 | |
| 11 | Robert Murdock# | 4.631 | 2016-2017 | |
| 12 | Aaron Wise# | 4.715 | 2017-2017 | |
| 13 | Harry Chipman | 4.721 | 2017-2017 | |
| 14 | Joseph Reed# | 4.785 | 2016-2016 | |
| 15 | Russ Rose# | 4.964 | 2017-2017 | |
| 16 | Jason Jackson# | 4.983 | 2016-2016 | |
| 17 | Calvin McVurie# | 5.088 | 2017-2017 | |
| 18 | Huai-yu Kan# | 5.095 | 2015-2017 | |
| 19 | Clifford Turner# | 5.155 | 2017-2017 | |
| 20 | Wayne Downey# | 5.232 | 2015-2016 | |
| 21 | Mike Hickey# | 5.433 | 2015-2017 | |
| 22 | Nicholas Wells# | 5.601 | 2017-2017 | |
| 23 | Fernando González# | 5.620 | 2017-2017 | |
| 24 | Brian Chandler# | 5.666 | 2017-2017 | |
| 25 | Bartolomeu Lio# | 5.720 | 2017-2017 | |
| 26 | Dave Ponsonby# | 5.761 | 2015-2017 | |
| 27 | Júlio Hernández# | 5.795 | 2016-2016 | |
| 28 | Robert Dickinson# | 5.983 | 2015-2017 | |
| 29 | Félix Jiménez# | 6.027 | 2016-2017 | |
| 30 | Jorge Candelária | 6.048 | 2015-2015 | |
| 31 | Fred Pitts# | 6.091 | 2015-2017 | |
| 32 | Tom Gibbs# | 6.127 | 2015-2016 | |
| 33 | Matthew Barnes | 6.245 | 2016-2017 | |
| 34 | Jorge Torres# | 6.539 | 2015-2016 | |
| 35 | Rafael Clemente# | 6.628 | 2015-2017 | |
| 36 | Kevin Gardner | 6.821 | 2015-2016 | |
| 37 | Aurélio Senna# | 7.031 | 2015-2017 | |
| 38 | Lee Reynolds# | 7.509 | 2015-2017 | |
| 39 | Shane Giles | 7.610 | 2016-2017 | |
| 40 | Ken Bane# | 9.630 | 2015-2016 |
