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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 | Nick Slover# | 1.761 | 2022-2025 | |
| 3 | Santos Martinez | 1.778 | 2000-2012 | |
| 4 | Chris Jacoby# | 1.800 | 2015-2025 | |
| 5 | Scott Schowalter | 1.815 | 2012-2021 | |
| 6 | Carlos Pardo | 1.871 | 2012-2021 | |
| 7 | Francisco Camacho | 1.929 | 2000-2013 | |
| 8 | Rich Forbes# | 1.957 | 2013-2025 | |
| 9 | Chris Mattison | 2.035 | 2012-2019 | |
| 10 | Phil Gregoire# | 2.047 | 2013-2025 | |
| 11 | Corey Johnson | 2.048 | 2010-2020 | |
| 12 | Sergio Martinez | 2.077 | 2005-2017 | |
| 13 | Takeji Takano# | 2.106 | 2024-2025 | |
| 14 | Todd Thompson# | 2.126 | 2015-2025 | |
| 15 | Chris Harris | 2.167 | 2007-2020 | |
| 16 | Jeff Buck# | 2.182 | 2015-2025 | |
| 17 | Aaron Sutton | 2.361 | 2009-2021 | |
| 18 | Cameron Hutchinson# | 2.374 | 2015-2025 | |
| 19 | William Deel# | 2.382 | 2022-2025 | |
| 20 | Brett Dorman | 2.455 | 2005-2019 | |
| 21 | Chris Frost | 2.472 | 2011-2022 | |
| 22 | Chris Johnson | 2.560 | 2007-2018 | |
| 23 | Oscar Martinez | 2.571 | 2000-2010 | |
| 24 | Brad Hower | 2.607 | 2010-2024 | |
| 25 | Jose Rodriguez* | 2.613 | 2000-2016 | |
| 26 | Paul Ledford* | 2.619 | 2000-2013 | |
| 27 | Dave Harvey# | 2.652 | 2020-2025 | |
| 28 | Daishin Uchida | 2.664 | 2008-2016 | |
| 29 | Brian Prince | 2.672 | 2011-2024 | |
| 30 | Kory Tourville | 2.748 | 2014-2024 | |
| 31 | Andy Dooley# | 2.808 | 2014-2025 | |
| 32 | Hector Moralez | 2.829 | 2011-2019 | |
| 33 | Joe Hart# | 2.830 | 2013-2025 | |
| 34 | Dan Miller# | 2.835 | 2018-2025 | |
| 35 | Gordie Clifford# | 2.842 | 2013-2024 | |
| 35 | Johnny Keener# | 2.842 | 2015-2025 | |
| 37 | Tom Kitko | 2.876 | 2012-2023 | |
| 38 | Aubrey Morrison | 2.967 | 2000-2011 | |
| 39 | Nate Briceno# | 3.000 | 2015-2025 | |
| 39 | Adam Farmer | 3.000 | 2000-2009 | |
| 39 | Hethum Manasarian | 3.000 | 2001-2020 | |
| 42 | Bill Vasquez | 3.050 | 2000-2012 | |
| 43 | Heriberto Milan | 3.059 | 2007-2022 | |
| 44 | Felipe Gonzalez | 3.062 | 2011-2020 | |
| 45 | Jordan Clarke | 3.083 | 2004-2023 | |
| 46 | William Arredondo | 3.094 | 2000-2012 | |
| 47 | Nelson Cirilo | 3.126 | 2007-2014 | |
| 47 | Pat Payne | 3.126 | 2009-2023 | |
| 49 | Alejandro Marquina | 3.176 | 2002-2016 | |
| 50 | Josh Flaten# | 3.191 | 2015-2025 | |
| 51 | Blake Barber | 3.205 | 2000-2007 | |
| 52 | Corbett Wright | 3.240 | 2010-2024 | |
| 53 | Sean Bartol | 3.246 | 2000-2010 | |
| 54 | Bill Flowers# | 3.260 | 2011-2025 | |
| 55 | Oreste Comollo | 3.280 | 2001-2014 | |
| 56 | Luke Scrimger# | 3.288 | 2019-2025 | |
| 57 | Elard Nijhuis | 3.311 | 2000-2009 | |
| 58 | Iliana Preciado | 3.320 | 2000-2009 | |
| 59 | Travis Thurber# | 3.360 | 2005-2024 | |
| 60 | Matt Graham# | 3.412 | 2020-2025 | |
| 61 | Rodrigo Lemus# | 3.419 | 2013-2025 | |
| 62 | Sean Stevens# | 3.431 | 2023-2025 | |
| 63 | Barry McLamb# | 3.436 | 2013-2023 | |
| 64 | Pat Hovhannisian# | 3.447 | 2014-2025 | |
| 65 | Josh Shute | 3.468 | 2013-2018 | |
| 66 | Austin Bauer | 3.484 | 2005-2014 | |
| 66 | Justin Turbeville | 3.484 | 2008-2018 | |
| 68 | Dan Mills# | 3.489 | 2014-2025 | |
| 69 | Branden Covington# | 3.522 | 2024-2025 | |
| 69 | Yosaburo Kanda | 3.522 | 2013-2022 | |
| 71 | Xiang-ling Fei* | 3.551 | 2000-2012 | |
| 72 | Jose Ojeda# | 3.557 | 2020-2025 | |
| 73 | Corey Gruver# | 3.576 | 2006-2025 | |
| 74 | Zachary Facundo | 3.584 | 2000-2009 | |
| 75 | Omar Cons# | 3.627 | 2023-2025 | |
| 76 | Alfredo Tiscareno# | 3.640 | 2010-2025 | |
| 77 | Adrian Radecki | 3.667 | 2012-2019 | |
| 78 | Geremia Farinelli | 3.676 | 2000-2014 | |
| 79 | Stephen Stride | 3.741 | 2011-2022 | |
| 80 | Roberto Salazar# | 3.750 | 2013-2025 | |
| 81 | Antonio Enriquez# | 3.780 | 2016-2025 | |
| 82 | Jonathan Allen# | 3.793 | 2016-2025 | |
| 83 | Andres Encarnacion | 3.818 | 2000-2011 | |
| 84 | Chris Bentley | 3.825 | 2008-2020 | |
| 84 | Damien Haling | 3.825 | 2000-2011 | |
| 86 | Antonio Higuera# | 3.872 | 2007-2025 | |
| 87 | Jorge Lopez | 3.894 | 2004-2013 | |
| 88 | Aubert Rebellin | 3.897 | 2009-2014 | |
| 89 | Carlos Garcia | 3.900 | 2000-2014 | |
| 89 | Dillon Moyer | 3.900 | 2002-2014 | |
| 91 | Justin Jemison# | 3.940 | 2019-2025 | |
| 92 | Josh Huggins# | 4.000 | 2022-2025 | |
| 93 | Felipe Ayala# | 4.059 | 2013-2025 | |
| 94 | Bob Baucke# | 4.075 | 2013-2025 | |
| 95 | Casey Abbott# | 4.087 | 2009-2025 | |
| 96 | Jayden Nesmith | 4.091 | 2012-2023 | |
| 97 | David Edgemon# | 4.109 | 2021-2025 | |
| 98 | Danny Offen# | 4.121 | 2020-2025 | |
| 99 | Sam Campos# | 4.122 | 2020-2025 | |
| 100 | Julian Bryant# | 4.127 | 2020-2025 |
