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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 | |
| 1 | Dave Harvey# | 0.000 | 2025 | |
| 3 | Evan Pullman# | 0.329 | 2022 | |
| 4 | Luke Scrimger# | 0.391 | 2023 | |
| 5 | Pat Payne | 0.466 | 2011 | |
| 6 | Dillon Moyer | 0.491 | 2011 | |
| 7 | Tom Franzoni* | 0.562 | 2005 | |
| 7 | Julian Rangel | 0.562 | 2016 | |
| 9 | Yosaburo Kanda | 0.783 | 2014 | |
| 10 | Bill Vasquez | 0.857 | 2003 | |
| 11 | Cody Morosko | 0.871 | 2001 | |
| 12 | Rodrigo Lemus# | 0.982 | 2016 | |
| 13 | Bill Flowers# | 1.019 | 2012 | |
| 14 | Chris Mattison | 1.038 | 2014 | |
| 15 | Iliana Preciado | 1.080 | 2005 | |
| 15 | Emmanuel Mendoza | 1.080 | 2013 | |
| 17 | Quito Herrera# | 1.102 | 2021 | |
| 18 | Andy Waring# | 1.157 | 2022 | |
| 19 | Justin Jemison# | 1.174 | 2019 | |
| 19 | Kory Tourville | 1.174 | 2019 | |
| 21 | Corey Gruver# | 1.266 | 2010 | |
| 22 | Joe Hart# | 1.286 | 2016 | |
| 23 | Heriberto Milan | 1.301 | 2010 | |
| 24 | Jordan Clarke | 1.306 | 2008 | |
| 25 | Takeji Takano# | 1.324 | 2025 | |
| 26 | Brian Prince | 1.333 | 2016 | |
| 27 | Bill Vasquez | 1.421 | 2008 | |
| 28 | Corey Gruver# | 1.440 | 2014 | |
| 29 | Chris Kuperman | 1.473 | 2010 | |
| 30 | Johnny Keener# | 1.479 | 2018 | |
| 31 | Tyrone Hairston | 1.500 | 2009 | |
| 31 | Phil Gregoire# | 1.500 | 2015 | |
| 33 | Jonathan Allen# | 1.528 | 2020 | |
| 34 | Rodrigo Lemus# | 1.558 | 2017 | |
| 34 | Bill Flowers# | 1.558 | 2011 | |
| 36 | Phil Gregoire# | 1.565 | 2016 | |
| 37 | Hector Moralez | 1.607 | 2012 | |
| 38 | Antonio Higuera# | 1.612 | 2019 | |
| 39 | Joe Hart# | 1.662 | 2015 | |
| 40 | Johnny Keener# | 1.667 | 2017 | |
| 41 | Adam D'Alberto# | 1.688 | 2020 | |
| 42 | Blake Barber | 1.742 | 2003 | |
| 43 | Justin Turbeville | 1.800 | 2014 | |
| 44 | Paul Ledford* | 1.862 | 2009 | |
| 44 | Tom Kitko | 1.862 | 2021 | |
| 46 | Paul Ledford* | 1.884 | 2012 | |
| 47 | Alfredo Tiscareno# | 1.929 | 2014 | |
| 48 | Nick Slover# | 1.985 | 2024 | |
| 49 | Josh Flaten# | 2.077 | 2015 | |
| 49 | Chad Stokes | 2.077 | 2008 | |
| 51 | Jonathan Luna | 2.104 | 2007 | |
| 52 | Joe Young | 2.109 | 2004 | |
| 53 | Antonio Enriquez# | 2.160 | 2017 | |
| 53 | Xiang-ling Fei* | 2.160 | 2010 | |
| 55 | Felipe Gonzalez | 2.204 | 2016 | |
| 56 | Kyle Ziegler | 2.250 | 2003 | |
| 56 | Seth Dann | 2.250 | 2011 | |
| 56 | Iliana Preciado | 2.250 | 2008 | |
| 56 | Chris Harris | 2.250 | 2016 | |
| 60 | Paul Ledford* | 2.298 | 2008 | |
| 60 | Adam Farmer | 2.298 | 2005 | |
| 62 | Chad Landreth | 2.328 | 2016 | |
| 63 | Xiang-ling Fei* | 2.348 | 2008 | |
| 64 | Roberto Salazar# | 2.368 | 2015 | |
| 64 | Andy Weatherholt# | 2.368 | 2021 | |
| 64 | Jason Hollenbeck# | 2.368 | 2022 | |
| 67 | Sean Bartol | 2.382 | 2006 | |
| 68 | Oscar Malave# | 2.400 | 2018 | |
| 68 | Jose Ojeda# | 2.400 | 2025 | |
| 70 | Jonathan Luna | 2.423 | 2009 | |
| 71 | Josh Shute | 2.427 | 2015 | |
| 72 | Alfredo Tiscareno# | 2.487 | 2018 | |
| 73 | Dan Miller# | 2.500 | 2019 | |
| 73 | Eric Burdine* | 2.500 | 2002 | |
| 75 | Aaron Sutton | 2.512 | 2012 | |
| 76 | Andy Dooley# | 2.531 | 2021 | |
| 77 | Byung-sik Lee | 2.541 | 2006 | |
| 78 | Jorge Valdez | 2.571 | 2010 | |
| 79 | Jody Fouse# | 2.647 | 2017 | |
| 80 | Rodolfo Soto# | 2.662 | 2015 | |
| 81 | Corey Gruver# | 2.676 | 2015 | |
| 82 | Chris Benson# | 2.700 | 2022 | |
| 82 | Oscar Martinez | 2.700 | 2003 | |
| 82 | Heriberto Milan | 2.700 | 2009 | |
| 85 | Chad Landreth | 2.755 | 2006 | |
| 86 | Pat Payne | 2.769 | 2014 | |
| 87 | Miguel Isiordia | 2.793 | 2008 | |
| 87 | Mike Nave | 2.793 | 2014 | |
| 87 | Paul Ledford* | 2.793 | 2005 | |
| 90 | Logan Stone | 2.812 | 2016 | |
| 91 | Corey Gruver# | 2.842 | 2020 | |
| 92 | Jack Ivory# | 2.856 | 2019 | |
| 93 | Andy Weatherholt# | 2.864 | 2023 | |
| 93 | Aaron Sutton | 2.864 | 2013 | |
| 93 | Justin Turbeville | 2.864 | 2015 | |
| 96 | Chris Bentley | 2.872 | 2011 | |
| 96 | Julian Bryant# | 2.872 | 2022 | |
| 98 | Eric Burdine* | 2.893 | 2011 | |
| 98 | William Deel# | 2.893 | 2024 | |
| 98 | Xiang-ling Fei* | 2.893 | 2005 |
