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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Paul Ledford* | 1.460 | 2006 | |
| 2 | Corbett Wright# | 1.612 | 2014 | |
| 3 | Paul Ledford* | 1.807 | 2008 | |
| 4 | Joe Hart# | 1.810 | 2016 | |
| 5 | Andy Weatherholt# | 1.818 | 2021 | |
| 6 | Joe Hart# | 1.842 | 2021 | |
| 7 | Chris Frost# | 1.849 | 2014 | |
| 8 | Dan Miller# | 1.875 | 2021 | |
| 9 | Pat Hovhannisian# | 1.900 | 2014 | |
| 10 | Paul Ledford* | 1.912 | 2013 | |
| 11 | Eric Burdine | 1.929 | 2014 | |
| 11 | Rodrigo Lemus# | 1.929 | 2016 | |
| 13 | Bill Flowers# | 1.957 | 2012 | |
| 14 | Zachary Christman# | 1.967 | 2016 | |
| 15 | Aaron Sutton | 1.978 | 2011 | |
| 16 | Josh Shute | 2.008 | 2015 | |
| 17 | Chris Harris | 2.017 | 2013 | |
| 18 | Aaron Sutton | 2.043 | 2014 | |
| 19 | Chad Landreth | 2.056 | 2004 | |
| 20 | J.R. Mitchell# | 2.058 | 2014 | |
| 21 | Corbett Wright# | 2.060 | 2012 | |
| 22 | Felipe Ayala# | 2.086 | 2016 | |
| 23 | Pat Payne# | 2.091 | 2011 | |
| 24 | Bill Flowers# | 2.100 | 2014 | |
| 25 | Rodrigo Lemus# | 2.102 | 2017 | |
| 26 | Felipe Gonzalez# | 2.119 | 2014 | |
| 27 | Andres Moran# | 2.120 | 2021 | |
| 28 | Andy Shoemaker# | 2.121 | 2016 | |
| 29 | Heriberto Milan# | 2.141 | 2012 | |
| 30 | Paul Ledford* | 2.143 | 2000 | |
| 31 | Pat Payne# | 2.146 | 2014 | |
| 32 | Corbett Wright# | 2.151 | 2016 | |
| 33 | Corbett Wright# | 2.169 | 2015 | |
| 34 | Eric Burdine | 2.185 | 2002 | |
| 35 | Austin Bauer | 2.215 | 2012 | |
| 35 | Olímpio Forjaz | 2.215 | 2003 | |
| 37 | Du-sung Moon | 2.217 | 2004 | |
| 38 | Joe Hewson# | 2.263 | 2014 | |
| 38 | Du-sung Moon | 2.263 | 2006 | |
| 40 | Joe Hart# | 2.269 | 2017 | |
| 41 | Sam Campos# | 2.272 | 2021 | |
| 41 | Jeff Glissman | 2.272 | 2007 | |
| 43 | Chris Frost# | 2.275 | 2016 | |
| 44 | Du-sung Moon | 2.279 | 2003 | |
| 44 | Jeff Rochefort# | 2.279 | 2015 | |
| 46 | Rodolfo Soto# | 2.285 | 2015 | |
| 47 | Heriberto Milan# | 2.290 | 2011 | |
| 48 | Ryan Simpson# | 2.298 | 2016 | |
| 48 | Nick Lawson | 2.298 | 2003 | |
| 48 | Bill Flowers# | 2.298 | 2016 | |
| 51 | Rodrigo Lemus# | 2.299 | 2020 | |
| 52 | Eric Burdine | 2.310 | 2000 | |
| 53 | Sean Bartol | 2.317 | 2004 | |
| 54 | Alex Padial | 2.323 | 2011 | |
| 55 | Phil Gregoire# | 2.331 | 2014 | |
| 56 | Jaden Mack# | 2.348 | 2021 | |
| 57 | Danny Barraza | 2.350 | 2013 | |
| 58 | Vance Adams | 2.354 | 2008 | |
| 59 | Corbett Wright# | 2.359 | 2020 | |
| 60 | Chris Shifflett | 2.360 | 2011 | |
| 61 | Bryan Kaiser | 2.382 | 2011 | |
| 62 | Jonathan Gonzales# | 2.386 | 2014 | |
| 63 | Du-sung Moon | 2.390 | 2005 | |
| 64 | Hiromi Fukuda | 2.400 | 2006 | |
| 65 | Eric Burdine | 2.403 | 2012 | |
| 66 | Nelson Cirilo | 2.406 | 2009 | |
| 67 | Andy McCullough | 2.413 | 2013 | |
| 68 | Rogelio Aburto | 2.417 | 2014 | |
| 69 | Justin Turbeville | 2.419 | 2015 | |
| 70 | Felipe Ayala# | 2.423 | 2020 | |
| 71 | Bill Flowers# | 2.427 | 2015 | |
| 72 | Joe Hewson# | 2.447 | 2015 | |
| 73 | Gerardo Cruz# | 2.459 | 2014 | |
| 74 | Emmanuel Mendoza# | 2.467 | 2013 | |
| 75 | Cody Morosko | 2.478 | 2006 | |
| 76 | Seth Carey | 2.480 | 2014 | |
| 77 | Travis Thurber# | 2.482 | 2014 | |
| 77 | Aaron Sutton | 2.482 | 2012 | |
| 79 | Carlos Mendez# | 2.487 | 2017 | |
| 80 | Jose Moreno | 2.497 | 2000 | |
| 81 | Matt Schmid# | 2.498 | 2015 | |
| 82 | Heriberto Milan# | 2.510 | 2014 | |
| 83 | Jeff Rochefort# | 2.513 | 2014 | |
| 84 | Victor Herrera# | 2.517 | 2014 | |
| 84 | Heriberto Milan# | 2.517 | 2009 | |
| 86 | Joel Daniels# | 2.521 | 2017 | |
| 87 | J.R. Mitchell# | 2.522 | 2015 | |
| 88 | Tom Tchida# | 2.526 | 2020 | |
| 89 | Greg Sandlin# | 2.531 | 2014 | |
| 90 | Jonathan Higginbotham# | 2.534 | 2011 | |
| 90 | Miles Hale | 2.534 | 2005 | |
| 92 | Joel Vens | 2.537 | 2015 | |
| 93 | Rodrigo Lemus# | 2.539 | 2019 | |
| 94 | Jordan Clarke# | 2.542 | 2007 | |
| 95 | Danny Carmona | 2.547 | 2014 | |
| 96 | Elard Nijhuis | 2.548 | 2004 | |
| 97 | Paul Ledford* | 2.550 | 2009 | |
| 97 | Chris Stein | 2.550 | 2007 | |
| 97 | Paul Ledford* | 2.550 | 2010 | |
| 100 | Bill Vasquez | 2.552 | 2008 |
