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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Justin Hesley# | 1.294 | 2022 | |
| 2 | Chris Benson# | 1.321 | 2016 | |
| 3 | Adam Haire | 1.391 | 2016 | |
| 4 | Ryan Johnson# | 1.426 | 2021 | |
| 5 | Gil Martinez | 1.566 | 2018 | |
| 6 | Brad Edwards# | 1.775 | 2014 | |
| 7 | Jose Rodriguez | 1.808 | 2011 | |
| 8 | Rick Collins# | 1.817 | 2021 | |
| 9 | Manuel Valentin | 1.822 | 2005 | |
| 10 | David Germosen | 1.834 | 2010 | |
| 10 | Enrique Andino | 1.834 | 2016 | |
| 12 | Matt Rector | 1.861 | 2018 | |
| 13 | Jaden Mack# | 1.874 | 2019 | |
| 14 | John Manship# | 1.877 | 2022 | |
| 15 | Cesar Escobedo | 1.880 | 2018 | |
| 16 | Arturo Alvarado# | 1.899 | 2023 | |
| 17 | Mike Tilley | 1.907 | 2018 | |
| 18 | Cody Stewart | 1.935 | 2012 | |
| 19 | Nate Aguirre | 1.937 | 2011 | |
| 20 | Kareem Craig# | 2.004 | 2020 | |
| 21 | Randy Fischer# | 2.009 | 2022 | |
| 22 | Rob Stech# | 2.016 | 2022 | |
| 23 | Mel Duran | 2.028 | 2018 | |
| 24 | Eddie Sarabia# | 2.042 | 2022 | |
| 25 | Jaylin Moyer# | 2.043 | 2015 | |
| 26 | Gilberto Cortez# | 2.052 | 2024 | |
| 27 | Andy Jackson | 2.060 | 2003 | |
| 28 | Jose Velez | 2.077 | 2018 | |
| 29 | Dave Figley# | 2.105 | 2023 | |
| 30 | Nate McClaskey# | 2.108 | 2017 | |
| 31 | Nick Carrier# | 2.111 | 2023 | |
| 32 | Mike Mayes | 2.114 | 2021 | |
| 33 | Mark Pung | 2.118 | 2008 | |
| 34 | Mario Manrique | 2.121 | 2017 | |
| 34 | Tim Darden | 2.121 | 2012 | |
| 36 | Matt Garcia | 2.167 | 2001 | |
| 37 | Seung-woo Park | 2.204 | 2019 | |
| 38 | Jim Ummel | 2.214 | 2012 | |
| 39 | Steve Hill# | 2.230 | 2020 | |
| 40 | Matt Cummings | 2.242 | 2011 | |
| 41 | Bill Torres | 2.250 | 2006 | |
| 41 | Matt Burnham | 2.250 | 2018 | |
| 41 | Miguel Aviles | 2.250 | 2021 | |
| 44 | Donatello Nardo | 2.276 | 2011 | |
| 44 | Matt Hosch | 2.276 | 2013 | |
| 46 | Bubba Byrne# | 2.290 | 2022 | |
| 47 | Russ Chery | 2.293 | 2013 | |
| 48 | Ricardo Cardona | 2.307 | 2015 | |
| 49 | Dan Fischer# | 2.330 | 2022 | |
| 50 | Joe Brackett# | 2.348 | 2022 | |
| 50 | Mike Friedrich | 2.348 | 2010 | |
| 52 | Jesus Luna | 2.365 | 2019 | |
| 53 | Ryan Roeser# | 2.370 | 2025 | |
| 54 | Dustin Jones | 2.384 | 2019 | |
| 55 | Victor Garza | 2.389 | 2018 | |
| 56 | Danny Salazar | 2.405 | 2004 | |
| 57 | Kevin McRoberts | 2.412 | 2022 | |
| 58 | Ton Ariëns# | 2.413 | 2020 | |
| 59 | Colin Esser# | 2.439 | 2018 | |
| 60 | Matt Dickson# | 2.443 | 2019 | |
| 61 | Justin Hesley# | 2.444 | 2021 | |
| 61 | Dionísio Manteigueiro# | 2.444 | 2020 | |
| 63 | Nick Carrier# | 2.449 | 2021 | |
| 64 | Ian Hutchinson | 2.459 | 2015 | |
| 65 | David Gacia | 2.469 | 2017 | |
| 66 | Bubba Byrne# | 2.474 | 2023 | |
| 67 | Freddy Arellanos# | 2.491 | 2022 | |
| 67 | Mike Montoya | 2.491 | 2015 | |
| 67 | Curt DiFrancesco | 2.491 | 2002 | |
| 70 | Steve Parent | 2.501 | 2018 | |
| 71 | Luis Aguirre# | 2.504 | 2023 | |
| 72 | Hector Dimiceli | 2.506 | 2006 | |
| 73 | Pete Mill | 2.509 | 2016 | |
| 74 | Raquel Cochat | 2.512 | 2013 | |
| 75 | Toshimichi Miyakawa# | 2.514 | 2015 | |
| 76 | Mike Mayes | 2.515 | 2019 | |
| 77 | Danny Rivas | 2.524 | 2017 | |
| 77 | Tim Darden | 2.524 | 2013 | |
| 79 | Jose Paredes# | 2.526 | 2019 | |
| 80 | David Silva | 2.528 | 2018 | |
| 81 | Denny Arizpe | 2.534 | 2018 | |
| 82 | Sal Reyes | 2.538 | 2022 | |
| 83 | Rich Baker | 2.561 | 2005 | |
| 84 | Rick Lee | 2.563 | 2016 | |
| 85 | Jonathan Bravo | 2.569 | 2019 | |
| 86 | Justin Pennington | 2.576 | 2016 | |
| 87 | David Tirado# | 2.582 | 2023 | |
| 88 | Chris Hawes# | 2.586 | 2022 | |
| 89 | Glenn Ward# | 2.595 | 2019 | |
| 90 | Omar Valentin# | 2.596 | 2025 | |
| 91 | Ryan Johnson# | 2.601 | 2022 | |
| 92 | Ben Calder# | 2.609 | 2023 | |
| 93 | Diego Cortes | 2.617 | 2018 | |
| 94 | John Manship# | 2.626 | 2024 | |
| 95 | Alexis Hernandez | 2.631 | 2012 | |
| 96 | Eric Cochran | 2.641 | 2011 | |
| 97 | Jared Jones | 2.685 | 2019 | |
| 98 | Dave Combs# | 2.688 | 2019 | |
| 99 | Moises Gonzalez | 2.695 | 2019 | |
| 100 | David Fadely# | 2.700 | 2023 |
