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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Chris Benson# | 1.321 | 2016 | |
| 2 | Adam Haire | 1.391 | 2016 | |
| 3 | Ryan Johnson# | 1.426 | 2021 | |
| 4 | Gil Martinez# | 1.566 | 2018 | |
| 5 | Brad Edwards# | 1.775 | 2014 | |
| 6 | Jose Rodriguez | 1.808 | 2011 | |
| 7 | Rick Collins# | 1.817 | 2021 | |
| 8 | Manuel Valentin | 1.822 | 2005 | |
| 9 | David Germosen | 1.834 | 2010 | |
| 9 | Enrique Andino | 1.834 | 2016 | |
| 11 | Matt Rector# | 1.861 | 2018 | |
| 12 | Jaden Mack# | 1.874 | 2019 | |
| 13 | Cesar Escobedo# | 1.880 | 2018 | |
| 14 | Mike Tilley | 1.907 | 2018 | |
| 15 | Cody Stewart# | 1.935 | 2012 | |
| 16 | Nate Aguirre | 1.937 | 2011 | |
| 17 | Kareem Craig# | 2.004 | 2020 | |
| 18 | Mel Duran# | 2.028 | 2018 | |
| 19 | Jaylin Moyer# | 2.043 | 2015 | |
| 20 | Andy Jackson | 2.060 | 2003 | |
| 21 | Jose Velez | 2.077 | 2018 | |
| 22 | Nate McClaskey# | 2.108 | 2017 | |
| 23 | Mike Mayes# | 2.114 | 2021 | |
| 24 | Mark Pung | 2.118 | 2008 | |
| 25 | Mario Manrique | 2.121 | 2017 | |
| 25 | Tim Darden | 2.121 | 2012 | |
| 27 | Matt Garcia | 2.167 | 2001 | |
| 28 | Seung-woo Park# | 2.204 | 2019 | |
| 29 | Jim Ummel | 2.214 | 2012 | |
| 30 | Steve Hill# | 2.230 | 2020 | |
| 31 | Matt Cummings | 2.242 | 2011 | |
| 32 | Miguel Aviles# | 2.250 | 2021 | |
| 32 | Matt Burnham | 2.250 | 2018 | |
| 32 | Bill Torres | 2.250 | 2006 | |
| 35 | Donatello Nardo | 2.276 | 2011 | |
| 35 | Matt Hosch | 2.276 | 2013 | |
| 37 | Russ Chery | 2.293 | 2013 | |
| 38 | Ricardo Cardona# | 2.307 | 2015 | |
| 39 | Mike Friedrich | 2.348 | 2010 | |
| 40 | Jesus Luna | 2.365 | 2019 | |
| 41 | Dustin Jones | 2.384 | 2019 | |
| 42 | Victor Garza# | 2.389 | 2018 | |
| 43 | Danny Salazar | 2.405 | 2004 | |
| 44 | Ton Ariëns# | 2.413 | 2020 | |
| 45 | Colin Esser# | 2.439 | 2018 | |
| 46 | Matt Dickson# | 2.443 | 2019 | |
| 47 | Justin Hesley# | 2.444 | 2021 | |
| 47 | Dionísio Manteigueiro# | 2.444 | 2020 | |
| 49 | Nick Carrier# | 2.449 | 2021 | |
| 50 | Ian Hutchinson | 2.459 | 2015 | |
| 51 | David Gacia | 2.469 | 2017 | |
| 52 | Mike Montoya# | 2.491 | 2015 | |
| 52 | Curt DiFrancesco | 2.491 | 2002 | |
| 54 | Steve Parent | 2.501 | 2018 | |
| 55 | Hector Dimiceli | 2.506 | 2006 | |
| 56 | Pete Mill | 2.509 | 2016 | |
| 57 | Raquel Cochat | 2.512 | 2013 | |
| 58 | Toshimichi Miyakawa# | 2.514 | 2015 | |
| 59 | Mike Mayes# | 2.515 | 2019 | |
| 60 | Danny Rivas# | 2.524 | 2017 | |
| 60 | Tim Darden | 2.524 | 2013 | |
| 62 | Jose Paredes# | 2.526 | 2019 | |
| 63 | David Silva | 2.528 | 2018 | |
| 64 | Denny Arizpe | 2.534 | 2018 | |
| 65 | Rich Baker | 2.561 | 2005 | |
| 66 | Rick Lee | 2.563 | 2016 | |
| 67 | Jonathan Bravo | 2.569 | 2019 | |
| 68 | Justin Pennington | 2.576 | 2016 | |
| 69 | Glenn Ward# | 2.595 | 2019 | |
| 70 | Diego Cortes# | 2.617 | 2018 | |
| 71 | Alexis Hernandez | 2.631 | 2012 | |
| 72 | Eric Cochran | 2.641 | 2011 | |
| 73 | Jared Jones# | 2.685 | 2019 | |
| 74 | Dave Combs# | 2.688 | 2019 | |
| 75 | Moises Gonzalez# | 2.695 | 2019 | |
| 76 | Jorge Rebollar | 2.700 | 2011 | |
| 77 | Tom Parson | 2.712 | 2000 | |
| 78 | Nick Radloff | 2.719 | 2005 | |
| 78 | Ron Peters | 2.719 | 2012 | |
| 80 | Nick Grzeskowiak# | 2.721 | 2019 | |
| 81 | Manny Ornelas | 2.725 | 2014 | |
| 82 | Seth Bruno | 2.728 | 2002 | |
| 83 | Dave Baker | 2.729 | 2015 | |
| 84 | Jimmy Byrd | 2.733 | 2011 | |
| 85 | Dustin Jones | 2.743 | 2018 | |
| 86 | Ian Hutchinson | 2.748 | 2016 | |
| 87 | Brett Cline | 2.749 | 2005 | |
| 88 | Chris Marquis# | 2.751 | 2016 | |
| 89 | Rick Harmon | 2.756 | 2000 | |
| 90 | Juan Ortiz | 2.758 | 2013 | |
| 91 | Alex Garcia | 2.761 | 2009 | |
| 92 | Matt Rector# | 2.769 | 2017 | |
| 93 | Omar Byrd | 2.782 | 2018 | |
| 94 | Brian Wilkey# | 2.787 | 2020 | |
| 95 | Jon Nave | 2.793 | 2007 | |
| 95 | Jake Guy | 2.793 | 2011 | |
| 95 | Steve Sutton | 2.793 | 2001 | |
| 98 | Andrew Chalmers | 2.797 | 2014 | |
| 99 | Cesar Escobedo# | 2.804 | 2017 | |
| 100 | Raul Mantilla | 2.808 | 2005 |
