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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Kyle Chamberlin | 2.824 | 2013-2021 | |
| 2 | Josh Hoffman | 2.876 | 2010-2014 | |
| 3 | Gil Johnson | 3.197 | 2000-2010 | |
| 4 | Leo Medina | 3.232 | 2000-2009 | |
| 5 | Phil Goodman | 3.275 | 2013-2018 | |
| 6 | Jesus Garcia# | 3.279 | 2018-2024 | |
| 7 | Joel Atkinson | 3.327 | 2012-2021 | |
| 8 | Sergio Hernandez | 3.332 | 2001-2013 | |
| 9 | Josh Graham | 3.343 | 2014-2018 | |
| 10 | Danny Justice | 3.413 | 2000-2010 | |
| 11 | Devin Nisbet | 3.442 | 2001-2013 | |
| 12 | Casey Levy# | 3.479 | 2018-2024 | |
| 13 | Mike Palmer | 4.004 | 2000-2010 | |
| 14 | Brendan Rees | 4.011 | 2001-2010 | |
| 15 | Tony Hernandez | 4.112 | 2000-2010 | |
| 16 | Enrique Perez | 4.201 | 2007-2023 | |
| 17 | Ryan Iverson | 4.237 | 2001-2007 | |
| 18 | Guo Liu | 4.344 | 2003-2010 | |
| 19 | Jaden Taylor | 4.375 | 2005-2013 | |
| 20 | Brian O'Connor | 4.459 | 2000-2006 | |
| 21 | Jose Rios | 4.982 | 2007-2016 |
