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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Nolan Arnold | 1.091 | 2010 | |
| 2 | António Alonzo | 1.439 | 2011 | |
| 3 | Chris Sale | 1.485 | 2010 | |
| 4 | Nathan Whalebelly | 1.494 | 2014 | |
| 5 | Anthony Hunt | 1.506 | 2013 | |
| 6 | Gerard Matthews | 1.658 | 2012 | |
| 7 | Michael Gittens | 1.678 | 2014 | |
| 8 | Nelson Sandoval | 1.900 | 2012 | |
| 9 | Roberto Ramírez# | 1.909 | 2027 | |
| 10 | Christian Sherman | 1.911 | 2012 | |
| 11 | Earl Collins | 1.933 | 2010 | |
| 12 | Miguel Hernández# | 1.992 | 2022 | |
| 13 | Seth Howatt# | 2.004 | 2024 | |
| 14 | Abraham Hoover | 2.055 | 2010 | |
| 15 | Jesús Gonzáles# | 2.083 | 2020 | |
| 16 | Luis Castaneda | 2.084 | 2011 | |
| 17 | Clarence Holland | 2.104 | 2013 | |
| 18 | Ben Moore# | 2.106 | 2021 | |
| 19 | Bill Hall | 2.146 | 2020 | |
| 20 | Tirta Suharto | 2.153 | 2020 | |
| 21 | Willard May | 2.184 | 2012 | |
| 22 | Clarence Holland | 2.204 | 2012 | |
| 23 | Jesús Ramírez# | 2.229 | 2027 | |
| 24 | James Miller | 2.242 | 2014 | |
| 25 | Phil Duffy | 2.250 | 2013 | |
| 26 | Danny Baker# | 2.258 | 2019 | |
| 27 | Rodrigo Mendoza# | 2.260 | 2031 | |
| 28 | Pedro González | 2.330 | 2014 | |
| 29 | Roy Snyder | 2.336 | 2015 | |
| 30 | Juan Luis Díaz# | 2.372 | 2021 | |
| 31 | Dave Dowden | 2.404 | 2016 | |
| 32 | Mike Prudom | 2.411 | 2014 | |
| 33 | Tommy Johnson | 2.428 | 2015 | |
| 34 | Kenny Wilson | 2.440 | 2011 | |
| 34 | Alfredo Taváres# | 2.440 | 2021 | |
| 36 | Cole Brewer# | 2.479 | 2022 | |
| 37 | Darren Opie# | 2.480 | 2024 | |
| 37 | Johnny Cueto | 2.480 | 2010 | |
| 39 | Culley Rolfe# | 2.483 | 2022 | |
| 40 | Dan White | 2.484 | 2010 | |
| 41 | Chad Durbin | 2.494 | 2010 | |
| 42 | Jay White# | 2.499 | 2022 | |
| 43 | Héctor Cavallaro# | 2.510 | 2024 | |
| 44 | Shelby Miller | 2.520 | 2011 | |
| 45 | Pancho Ramírez# | 2.529 | 2023 | |
| 46 | Soshu Hashimoto# | 2.557 | 2027 | |
| 47 | George Yates | 2.560 | 2014 | |
| 47 | David Dixon | 2.560 | 2021 | |
| 49 | Phil Madocks | 2.565 | 2011 | |
| 50 | Artie McCray# | 2.569 | 2023 | |
| 51 | José Ruíz# | 2.574 | 2024 | |
| 52 | Nelson Taylor# | 2.600 | 2024 | |
| 53 | Mike Jacobson# | 2.611 | 2027 | |
| 54 | Negussu Adewole | 2.619 | 2011 | |
| 55 | Héctor Olivares# | 2.621 | 2023 | |
| 56 | U-ram Ch'oe# | 2.638 | 2027 | |
| 57 | José Féliz# | 2.648 | 2030 | |
| 58 | Tommy Zellers# | 2.662 | 2020 | |
| 59 | James Swain# | 2.667 | 2016 | |
| 60 | Ricardo López# | 2.673 | 2026 | |
| 61 | Ricardo López# | 2.678 | 2025 | |
| 62 | Henning Bello# | 2.679 | 2027 | |
| 63 | Dave Myers | 2.691 | 2010 | |
| 64 | Kenny Mayes | 2.692 | 2014 | |
| 65 | Jesús Ramírez# | 2.694 | 2025 | |
| 66 | Clarence Holland | 2.700 | 2011 | |
| 67 | David Ladner | 2.710 | 2011 | |
| 68 | Cristián Negrón | 2.711 | 2013 | |
| 69 | Nick Baker | 2.726 | 2011 | |
| 70 | Pepe Davis | 2.729 | 2014 | |
| 71 | Emory Morrell# | 2.736 | 2031 | |
| 71 | Godfrey Burgmans# | 2.736 | 2027 | |
| 73 | Howard McGee | 2.743 | 2019 | |
| 74 | Daron Maddox | 2.753 | 2013 | |
| 75 | John Russell | 2.757 | 2015 | |
| 76 | Katsuyuki Sumita# | 2.761 | 2031 | |
| 77 | Christian Guillaume# | 2.768 | 2027 | |
| 78 | Eric Ford# | 2.772 | 2021 | |
| 79 | Andrés Herrera# | 2.778 | 2030 | |
| 80 | Juan Vega | 2.779 | 2011 | |
| 80 | Chris Moore | 2.779 | 2011 | |
| 82 | Cody Frost# | 2.782 | 2023 | |
| 83 | Ira Phelps | 2.784 | 2014 | |
| 84 | Roy Bolden | 2.790 | 2010 | |
| 85 | David Hernández | 2.796 | 2011 | |
| 86 | Matt Werner# | 2.799 | 2022 | |
| 87 | José Muñóz | 2.800 | 2014 | |
| 88 | Darrell Hicks# | 2.809 | 2025 | |
| 89 | Christian Guillaume# | 2.815 | 2028 | |
| 90 | Roy Ward | 2.816 | 2010 | |
| 91 | Rich Stuart | 2.822 | 2017 | |
| 91 | Humberto Atares# | 2.822 | 2023 | |
| 91 | Mark Jefferson# | 2.822 | 2022 | |
| 94 | David Medich | 2.831 | 2015 | |
| 95 | Darrell Hicks# | 2.833 | 2026 | |
| 95 | Jason Williams | 2.833 | 2011 | |
| 97 | Enrico Rúbio# | 2.839 | 2022 | |
| 98 | Tony Everhart | 2.842 | 2012 | |
| 99 | Dalton Moon# | 2.845 | 2019 | |
| 100 | José Vázquez# | 2.852 | 2031 |
