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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Hiromi Fukuda | 1.620 | 2006-2018 | |
| 2 | Santos Martinez | 1.778 | 2000-2012 | |
| 3 | Scott Schowalter# | 1.815 | 2012-2021 | |
| 4 | Carlos Pardo# | 1.871 | 2012-2021 | |
| 5 | Johnny Keener# | 1.895 | 2015-2021 | |
| 6 | Francisco Camacho | 1.929 | 2000-2013 | |
| 7 | Chris Mattison# | 2.035 | 2012-2019 | |
| 8 | Phil Gregoire# | 2.047 | 2013-2021 | |
| 9 | Corey Johnson | 2.048 | 2010-2020 | |
| 10 | Rich Forbes# | 2.077 | 2013-2021 | |
| 10 | Sergio Martinez | 2.077 | 2005-2017 | |
| 12 | Chris Harris | 2.167 | 2007-2020 | |
| 13 | Aaron Sutton | 2.361 | 2009-2021 | |
| 14 | Brett Dorman | 2.455 | 2005-2019 | |
| 14 | Roberto Salazar# | 2.455 | 2013-2021 | |
| 16 | Joe Hart# | 2.461 | 2013-2021 | |
| 17 | Chris Frost# | 2.472 | 2011-2021 | |
| 18 | Dan Miller# | 2.531 | 2018-2021 | |
| 19 | Chris Johnson | 2.560 | 2007-2018 | |
| 20 | Oscar Martinez | 2.571 | 2000-2010 | |
| 21 | Jose Rodriguez | 2.613 | 2000-2016 | |
| 22 | Paul Ledford* | 2.619 | 2000-2013 | |
| 23 | Daishin Uchida | 2.664 | 2008-2016 | |
| 24 | Brian Prince# | 2.672 | 2011-2021 | |
| 25 | Brad Hower# | 2.821 | 2010-2021 | |
| 26 | Hector Moralez | 2.829 | 2011-2019 | |
| 27 | Tom Kitko# | 2.876 | 2012-2021 | |
| 28 | Gordie Clifford# | 2.898 | 2013-2021 | |
| 29 | Aubrey Morrison | 2.967 | 2000-2011 | |
| 30 | Albert Fabian# | 2.972 | 2014-2021 | |
| 31 | Nate Briceno# | 3.000 | 2015-2020 | |
| 31 | Adam Farmer | 3.000 | 2000-2009 | |
| 31 | Jack Ivory# | 3.000 | 2018-2021 | |
| 31 | Hethum Manasarian | 3.000 | 2001-2020 | |
| 31 | Kory Tourville# | 3.000 | 2014-2021 | |
| 36 | Bill Vasquez | 3.050 | 2000-2012 | |
| 37 | Dan Mills# | 3.057 | 2014-2021 | |
| 38 | Heriberto Milan# | 3.059 | 2007-2021 | |
| 39 | Felipe Gonzalez# | 3.062 | 2011-2020 | |
| 40 | Jordan Clarke# | 3.083 | 2004-2021 | |
| 41 | William Arredondo | 3.094 | 2000-2012 | |
| 42 | Nelson Cirilo | 3.126 | 2007-2014 | |
| 42 | Pat Payne# | 3.126 | 2009-2021 | |
| 44 | Alejandro Marquina | 3.176 | 2002-2016 | |
| 45 | Josh Flaten# | 3.191 | 2015-2021 | |
| 46 | Alfredo Tiscareno# | 3.200 | 2010-2021 | |
| 47 | Blake Barber | 3.205 | 2000-2007 | |
| 48 | Sean Bartol | 3.246 | 2000-2010 | |
| 49 | Corey Gruver# | 3.269 | 2006-2021 | |
| 50 | Oreste Comollo | 3.280 | 2001-2014 | |
| 50 | Justin Jemison# | 3.280 | 2019-2021 | |
| 52 | Casey Abbott# | 3.300 | 2009-2021 | |
| 53 | Elard Nijhuis | 3.311 | 2000-2009 | |
| 54 | Iliana Preciado | 3.320 | 2000-2009 | |
| 55 | Travis Thurber# | 3.360 | 2005-2021 | |
| 56 | Jonathan Allen# | 3.432 | 2016-2021 | |
| 57 | Corbett Wright# | 3.447 | 2010-2021 | |
| 57 | Pat Hovhannisian# | 3.447 | 2014-2021 | |
| 59 | Josh Shute | 3.468 | 2013-2018 | |
| 60 | Antonio Higuera# | 3.475 | 2007-2021 | |
| 61 | Austin Bauer | 3.484 | 2005-2014 | |
| 61 | Justin Turbeville | 3.484 | 2008-2018 | |
| 63 | Bill Flowers# | 3.498 | 2011-2021 | |
| 64 | Yosaburo Kanda# | 3.522 | 2013-2021 | |
| 65 | Xiang-ling Fei* | 3.551 | 2000-2012 | |
| 66 | Julian Bryant# | 3.560 | 2020-2021 | |
| 67 | Zachary Facundo | 3.584 | 2000-2009 | |
| 68 | Rodrigo Lemus# | 3.639 | 2013-2021 | |
| 69 | Adrian Radecki# | 3.667 | 2012-2019 | |
| 70 | Geremia Farinelli | 3.676 | 2000-2014 | |
| 71 | Felipe Ayala# | 3.720 | 2013-2021 | |
| 72 | Stephen Stride# | 3.741 | 2011-2020 | |
| 73 | Chris Booth# | 3.818 | 2019-2021 | |
| 73 | Andres Encarnacion | 3.818 | 2000-2011 | |
| 75 | Chris Bentley | 3.825 | 2008-2020 | |
| 75 | Damien Haling | 3.825 | 2000-2011 | |
| 77 | Jorge Lopez | 3.894 | 2004-2013 | |
| 78 | Aubert Rebellin | 3.897 | 2009-2014 | |
| 79 | Carlos Garcia | 3.900 | 2000-2014 | |
| 79 | Dillon Moyer | 3.900 | 2002-2014 | |
| 81 | Lee Morgan# | 4.000 | 2019-2021 | |
| 82 | Miguel Berrios# | 4.068 | 2018-2021 | |
| 83 | Barry McLamb# | 4.071 | 2013-2021 | |
| 84 | Jayden Nesmith# | 4.091 | 2012-2021 | |
| 85 | Ron Baumgardner | 4.131 | 2010-2019 | |
| 86 | Seth Dann | 4.135 | 2002-2013 | |
| 87 | Seth Carey | 4.154 | 2004-2016 | |
| 87 | Alexis Murguia | 4.154 | 2000-2007 | |
| 89 | Chad Landreth | 4.158 | 2001-2017 | |
| 90 | Jonathan Luna | 4.172 | 2000-2011 | |
| 91 | Sukeaki Kato | 4.205 | 2001-2014 | |
| 92 | Jose Moreno | 4.223 | 2000-2014 | |
| 93 | Justin Fielding | 4.290 | 2000-2013 | |
| 94 | Marty Capone# | 4.312 | 2019-2021 | |
| 95 | Cody Morosko | 4.329 | 2000-2010 | |
| 96 | Carlos Mendez# | 4.384 | 2011-2021 | |
| 97 | Greg Sandlin# | 4.398 | 2009-2021 | |
| 98 | Logan Stone# | 4.451 | 2010-2021 | |
| 99 | Keith Young | 4.456 | 2000-2007 | |
| 100 | Jeff Glissman | 4.459 | 2000-2010 |
