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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Sean Cofield# | 2.566 | 2011-2021 | |
| 2 | Cameron Outlaw# | 2.880 | 2015-2022 | |
| 3 | Federico Gonzalez | 2.978 | 2000-2009 | |
| 4 | Gabe Vincent# | 3.014 | 2012-2022 | |
| 5 | Brian Gann | 3.157 | 2000-2013 | |
| 6 | Enrique Perez# | 3.163 | 2009-2017 | |
| 7 | Luis Alcoser# | 3.176 | 2005-2022 | |
| 8 | Mauricio Martinez# | 3.203 | 2015-2022 | |
| 9 | Jonathan Parker# | 3.226 | 2011-2022 | |
| 10 | Terry Droubay# | 3.314 | 2017-2022 | |
| 11 | Adam Arnett | 3.317 | 2000-2009 | |
| 12 | Chris Pickens | 3.343 | 2005-2013 | |
| 13 | Jeremy Excell | 3.440 | 2000-2012 | |
| 14 | Gerardo Lozano | 3.458 | 2014-2021 | |
| 15 | Mike Felder | 3.474 | 2004-2014 | |
| 16 | Justin Steach | 3.529 | 2004-2014 | |
| 17 | Andy Jackson | 3.549 | 2005-2013 | |
| 18 | Brian Yates | 3.581 | 2003-2012 | |
| 19 | Nelson Martinez# | 3.585 | 2011-2022 | |
| 20 | Jon Caruso | 3.600 | 2004-2013 | |
| 21 | Josh Adams | 3.605 | 2000-2014 | |
| 22 | Cameron Brown | 3.624 | 2011-2018 | |
| 23 | Don Sheffield | 3.630 | 2000-2011 | |
| 24 | Brad Goodman | 3.658 | 2012-2021 | |
| 25 | Matt Beard | 3.734 | 2000-2013 | |
| 26 | Fred Muse | 3.766 | 2000-2012 | |
| 27 | Aaron Harrison | 3.771 | 2000-2010 | |
| 28 | Nick Giese | 3.783 | 2000-2009 | |
| 29 | Jonathan Lung | 3.826 | 2000-2011 | |
| 30 | Tadanori Kawasaki | 3.842 | 2005-2014 | |
| 31 | Jim Patrick | 3.855 | 2000-2011 | |
| 32 | Ramon Sandoval | 3.857 | 2000-2009 | |
| 33 | C.J. Mejia | 3.862 | 2011-2019 | |
| 34 | Ryan Hester | 3.878 | 2001-2011 | |
| 35 | Jesus Quintero | 3.887 | 2000-2009 | |
| 36 | Logan Johns | 3.911 | 2002-2011 | |
| 37 | Andy McCullough | 3.939 | 2000-2014 | |
| 38 | Justin Messer | 3.957 | 2000-2012 | |
| 39 | Edgar Gonzalez | 3.979 | 2000-2009 | |
| 40 | Tyler Byrd | 4.027 | 2000-2011 | |
| 41 | Dan Hagen | 4.039 | 2002-2013 | |
| 42 | Jonathan McMahon | 4.053 | 2001-2009 | |
| 43 | Arturo Jimenez | 4.072 | 2003-2013 | |
| 44 | Santiago Rodas | 4.085 | 2000-2010 | |
| 45 | Chris Auger | 4.087 | 2000-2009 | |
| 46 | Matt McPeak | 4.142 | 2000-2006 | |
| 47 | Ian Starcher | 4.158 | 2000-2012 | |
| 48 | Morgan Thompson | 4.199 | 2005-2014 | |
| 49 | Jose Estrada | 4.236 | 2000-2010 | |
| 50 | Matt Taub | 4.266 | 2005-2016 | |
| 50 | Will Moore | 4.266 | 2000-2009 | |
| 52 | Dave Vilca | 4.291 | 2000-2007 | |
| 53 | Bruce Hernandez | 4.307 | 2000-2008 | |
| 54 | Tom Schauman | 4.320 | 2003-2010 | |
| 55 | Brian Zubia | 4.326 | 2008-2015 | |
| 56 | Sean Prevost | 4.334 | 2005-2014 | |
| 57 | Alan Sweet | 4.335 | 2000-2009 | |
| 58 | Brad Parish | 4.413 | 2000-2008 | |
| 59 | Markus Mensink | 4.455 | 2000-2008 | |
| 60 | Mike Henken | 4.618 | 2001-2011 |
