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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Kyle Peacock# | 1.350 | 2055-2059 | |
| 2 | Karl Harrison# | 2.676 | 2056-2057 | |
| 3 | Miguel Ortiz | 3.000 | 2038-2040 | |
| 4 | Fred Argueta | 3.405 | 2030-2031 | |
| 5 | Nate Gavin# | 3.436 | 2058-2060 | |
| 6 | Jorge Angeles | 4.154 | 2050-2051 | |
| 7 | Vince Ellerbee | 4.219 | 2050-2052 | |
| 8 | Josh Wucherer# | 4.832 | 2056-2059 | |
| 9 | J.P. Larson# | 5.062 | 2057-2060 | |
| 10 | Mike McMaster | 5.538 | 2047-2051 | |
| 11 | Bill Cavanagh# | 6.618 | 2056-2060 |
