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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | William Deel# | 0.000 | 2023 | |
| 2 | Evan Pullman# | 0.329 | 2022 | |
| 3 | Luke Scrimger# | 0.391 | 2023 | |
| 4 | Pat Payne | 0.466 | 2011 | |
| 5 | Dillon Moyer | 0.491 | 2011 | |
| 6 | Julian Rangel | 0.562 | 2016 | |
| 6 | Tom Franzoni* | 0.562 | 2005 | |
| 8 | Yosaburo Kanda | 0.783 | 2014 | |
| 9 | Bill Vasquez | 0.857 | 2003 | |
| 10 | Cody Morosko | 0.871 | 2001 | |
| 11 | Rodrigo Lemus# | 0.982 | 2016 | |
| 12 | Bill Flowers# | 1.019 | 2012 | |
| 13 | Chris Mattison | 1.038 | 2014 | |
| 14 | Iliana Preciado | 1.080 | 2005 | |
| 14 | Emmanuel Mendoza# | 1.080 | 2013 | |
| 16 | Quito Herrera# | 1.102 | 2021 | |
| 17 | Andy Waring# | 1.157 | 2022 | |
| 18 | Justin Jemison# | 1.174 | 2019 | |
| 18 | Kory Tourville# | 1.174 | 2019 | |
| 20 | Corey Gruver# | 1.266 | 2010 | |
| 21 | Joe Hart# | 1.286 | 2016 | |
| 22 | Heriberto Milan | 1.301 | 2010 | |
| 23 | Jordan Clarke | 1.306 | 2008 | |
| 24 | Brian Prince# | 1.333 | 2016 | |
| 25 | Bill Vasquez | 1.421 | 2008 | |
| 26 | Corey Gruver# | 1.440 | 2014 | |
| 27 | Chris Kuperman | 1.473 | 2010 | |
| 28 | Johnny Keener# | 1.479 | 2018 | |
| 29 | Phil Gregoire# | 1.500 | 2015 | |
| 29 | Tyrone Hairston | 1.500 | 2009 | |
| 31 | Jonathan Allen# | 1.528 | 2020 | |
| 32 | Rodrigo Lemus# | 1.558 | 2017 | |
| 32 | Bill Flowers# | 1.558 | 2011 | |
| 34 | Phil Gregoire# | 1.565 | 2016 | |
| 35 | Hector Moralez | 1.607 | 2012 | |
| 36 | Antonio Higuera# | 1.612 | 2019 | |
| 37 | Joe Hart# | 1.662 | 2015 | |
| 38 | Johnny Keener# | 1.667 | 2017 | |
| 39 | Adam D'Alberto# | 1.688 | 2020 | |
| 40 | Blake Barber | 1.742 | 2003 | |
| 41 | Justin Turbeville | 1.800 | 2014 | |
| 42 | Paul Ledford* | 1.862 | 2009 | |
| 42 | Tom Kitko# | 1.862 | 2021 | |
| 44 | Paul Ledford* | 1.884 | 2012 | |
| 45 | Alfredo Tiscareno# | 1.929 | 2014 | |
| 46 | Chad Stokes | 2.077 | 2008 | |
| 46 | Josh Flaten# | 2.077 | 2015 | |
| 48 | Jonathan Luna | 2.104 | 2007 | |
| 49 | Joe Young | 2.109 | 2004 | |
| 50 | Antonio Enriquez# | 2.160 | 2017 | |
| 50 | Xiang-ling Fei* | 2.160 | 2010 | |
| 52 | Felipe Gonzalez | 2.204 | 2016 | |
| 53 | Seth Dann | 2.250 | 2011 | |
| 53 | Chris Harris | 2.250 | 2016 | |
| 53 | Kyle Ziegler | 2.250 | 2003 | |
| 53 | Iliana Preciado | 2.250 | 2008 | |
| 57 | Paul Ledford* | 2.298 | 2008 | |
| 57 | Adam Farmer | 2.298 | 2005 | |
| 59 | Chad Landreth | 2.328 | 2016 | |
| 60 | Xiang-ling Fei* | 2.348 | 2008 | |
| 61 | Jason Hollenbeck# | 2.368 | 2022 | |
| 61 | Andy Weatherholt# | 2.368 | 2021 | |
| 61 | Roberto Salazar# | 2.368 | 2015 | |
| 64 | Sean Bartol | 2.382 | 2006 | |
| 65 | Oscar Malave# | 2.400 | 2018 | |
| 66 | Jonathan Luna | 2.423 | 2009 | |
| 67 | Josh Shute | 2.427 | 2015 | |
| 68 | Alfredo Tiscareno# | 2.487 | 2018 | |
| 69 | Dan Miller# | 2.500 | 2019 | |
| 69 | Eric Burdine* | 2.500 | 2002 | |
| 71 | Aaron Sutton | 2.512 | 2012 | |
| 72 | Andy Dooley# | 2.531 | 2021 | |
| 73 | Byung-sik Lee | 2.541 | 2006 | |
| 74 | Jorge Valdez | 2.571 | 2010 | |
| 75 | Jody Fouse# | 2.647 | 2017 | |
| 76 | Rodolfo Soto# | 2.662 | 2015 | |
| 77 | Corey Gruver# | 2.676 | 2015 | |
| 78 | Chris Benson# | 2.700 | 2022 | |
| 78 | Heriberto Milan | 2.700 | 2009 | |
| 78 | Oscar Martinez | 2.700 | 2003 | |
| 81 | Chad Landreth | 2.755 | 2006 | |
| 82 | Pat Payne | 2.769 | 2014 | |
| 83 | Paul Ledford* | 2.793 | 2005 | |
| 83 | Mike Nave | 2.793 | 2014 | |
| 83 | Miguel Isiordia | 2.793 | 2008 | |
| 86 | Logan Stone# | 2.812 | 2016 | |
| 87 | Corey Gruver# | 2.842 | 2020 | |
| 88 | Jack Ivory# | 2.856 | 2019 | |
| 89 | Andy Weatherholt# | 2.864 | 2023 | |
| 89 | Aaron Sutton | 2.864 | 2013 | |
| 89 | Justin Turbeville | 2.864 | 2015 | |
| 92 | Julian Bryant# | 2.872 | 2022 | |
| 92 | Chris Bentley | 2.872 | 2011 | |
| 94 | Rusty Hays | 2.893 | 2005 | |
| 94 | Xiang-ling Fei* | 2.893 | 2005 | |
| 94 | Eric Burdine* | 2.893 | 2011 | |
| 97 | Joe Hart# | 2.928 | 2022 | |
| 98 | Rodrigo Lemus# | 2.945 | 2015 | |
| 99 | Kyle Ziegler | 2.953 | 2005 | |
| 99 | Nate Briceno# | 2.953 | 2015 |
