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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Germán Guzmán# | 1.651 | 2022 | |
| 2 | Roberto Chávez# | 1.728 | 2015 | |
| 3 | Paul d'Ar# | 1.831 | 2022 | |
| 4 | JP Massey# | 1.884 | 2022 | |
| 5 | Jason Ramos# | 2.004 | 2014 | |
| 6 | Dean Anderson# | 2.141 | 2018 | |
| 7 | Juan Rojas# | 2.160 | 2015 | |
| 8 | Kendall Williams# | 2.174 | 2021 | |
| 9 | Alex Brink# | 2.183 | 2022 | |
| 9 | Joe Cantrell# | 2.183 | 2017 | |
| 11 | Rod Swift# | 2.240 | 2017 | |
| 12 | Ian Dickson | 2.265 | 2014 | |
| 13 | Ken Gary# | 2.277 | 2017 | |
| 14 | Gary Griffith# | 2.287 | 2018 | |
| 15 | Tyler Glasnow# | 2.336 | 2014 | |
| 16 | Jorge Bruno# | 2.375 | 2020 | |
| 17 | Chad Brown# | 2.426 | 2015 | |
| 18 | Andrew Walter | 2.455 | 2012 | |
| 18 | Norm Thompson# | 2.455 | 2020 | |
| 18 | George Belew# | 2.455 | 2016 | |
| 21 | Hunter Johnson# | 2.473 | 2017 | |
| 22 | Joe Austin# | 2.492 | 2016 | |
| 23 | Shawn Stephens# | 2.494 | 2016 | |
| 24 | Juan Alvarado# | 2.583 | 2016 | |
| 25 | Jason Hatfield# | 2.590 | 2015 | |
| 26 | Ethan Reed# | 2.620 | 2020 | |
| 27 | Herb Field# | 2.631 | 2016 | |
| 28 | Eric Liniak# | 2.638 | 2018 | |
| 29 | Augusto Chávez# | 2.669 | 2022 | |
| 30 | Tyler Byrne# | 2.688 | 2021 | |
| 31 | Víctor De La Rosa | 2.689 | 2013 | |
| 32 | Jonathan Bowlan# | 2.710 | 2020 | |
| 32 | Billy Bishop# | 2.710 | 2017 | |
| 34 | Carson Fulmer# | 2.712 | 2014 | |
| 35 | Pedro Jiménez# | 2.732 | 2018 | |
| 36 | John Blevins# | 2.764 | 2018 | |
| 37 | Robert Crum# | 2.775 | 2018 | |
| 38 | Mike Short# | 2.812 | 2022 | |
| 39 | Hunter Ruth# | 2.836 | 2021 | |
| 40 | Ricardo Zapata# | 2.864 | 2018 | |
| 41 | Carson Kelly# | 2.869 | 2015 | |
| 42 | Brady Dutcher# | 2.889 | 2022 | |
| 42 | Tyson Oswalt# | 2.889 | 2018 | |
| 42 | Rubén Martínez# | 2.889 | 2018 | |
| 45 | Michael Fulmer | 2.893 | 2013 | |
| 46 | Joey Washington# | 2.922 | 2016 | |
| 47 | Jeffrey Decker# | 2.935 | 2020 | |
| 48 | Bernard Delaporte# | 2.979 | 2022 | |
| 49 | J.D. Neeleman# | 3.022 | 2022 | |
| 50 | Elwood Smith# | 3.026 | 2016 | |
| 51 | Raúl Martínez# | 3.047 | 2018 | |
| 52 | Bill Deely# | 3.059 | 2017 | |
| 53 | Esteban Castaneda# | 3.112 | 2016 | |
| 54 | Cisco Paschini# | 3.124 | 2017 | |
| 54 | Paul Orr# | 3.124 | 2016 | |
| 56 | Navy Shuler# | 3.158 | 2020 | |
| 57 | Robert Hayes | 3.219 | 2015 | |
| 58 | Mariano Francisco# | 3.222 | 2020 | |
| 59 | Leonel Bastidas | 3.255 | 2013 | |
| 60 | Sergio Díaz# | 3.260 | 2018 | |
| 61 | Blake Townsend# | 3.276 | 2021 | |
| 62 | Sergio Ortíz# | 3.285 | 2018 | |
| 63 | Eduardo Encarnación# | 3.316 | 2015 | |
| 64 | Mark McCall# | 3.347 | 2021 | |
| 65 | En-lai Zhang# | 3.354 | 2014 | |
| 66 | Javier Martínez# | 3.361 | 2016 | |
| 67 | Bill Smith# | 3.375 | 2017 | |
| 68 | Efrain Nieves | 3.387 | 2013 | |
| 69 | Abraham Walters# | 3.462 | 2021 | |
| 70 | Stuart Kennedy | 3.490 | 2015 | |
| 71 | Gregory Santos# | 3.502 | 2021 | |
| 72 | Craig McLaughlin# | 3.522 | 2021 | |
| 72 | Zach Rivera# | 3.522 | 2014 | |
| 74 | Jon Wells# | 3.588 | 2018 | |
| 75 | En-lai Zhang# | 3.621 | 2013 | |
| 76 | Sean Parks# | 3.630 | 2018 | |
| 77 | Austin Moore# | 3.652 | 2017 | |
| 78 | Greg Allison# | 3.667 | 2017 | |
| 79 | Luke Doty# | 3.700 | 2022 | |
| 80 | Skylar Spurrier# | 3.712 | 2017 | |
| 81 | Evan May# | 3.744 | 2017 | |
| 82 | Jacob Faria# | 3.770 | 2015 | |
| 83 | Jacob Faria# | 3.820 | 2014 | |
| 84 | Matt Bradley# | 3.828 | 2021 | |
| 85 | Michael Gillespie# | 3.841 | 2020 | |
| 86 | Enderson Franco# | 3.857 | 2014 | |
| 87 | Alberto Otero# | 3.874 | 2020 | |
| 88 | Caden Lemons# | 3.889 | 2019 | |
| 89 | Derrick Spencer# | 3.905 | 2021 | |
| 90 | Phil Mitchell# | 3.923 | 2019 | |
| 91 | Reginald Campbell# | 4.024 | 2020 | |
| 92 | Baptiste Bregonzi# | 4.060 | 2018 | |
| 93 | Randy Thompson# | 4.097 | 2018 | |
| 94 | Joe MacGregor# | 4.115 | 2019 | |
| 95 | Jack Lamb# | 4.127 | 2020 | |
| 96 | Aaron Wright# | 4.128 | 2019 | |
| 96 | Brenny Paulino | 4.128 | 2012 | |
| 98 | Jeff Fitzsymons# | 4.131 | 2016 | |
| 99 | Zack Thompson# | 4.154 | 2019 | |
| 100 | Adam Sorensen# | 4.172 | 2016 |
