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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Ramón Cruz | 2.179 | 2010 | |
| 2 | Santiago González | 2.254 | 2026 | |
| 3 | António Gálvez | 2.375 | 2014 | |
| 4 | John Martin | 2.481 | 2013 | |
| 5 | Davey Huckaby | 2.509 | 2013 | |
| 6 | Katsuhiko Takaki | 2.595 | 2011 | |
| 7 | Jesús Jaramillo | 2.635 | 2013 | |
| 8 | Jim Wither# | 2.650 | 2035 | |
| 9 | Javier González | 2.674 | 2026 | |
| 10 | Lorenzo Aguilar# | 2.726 | 2024 | |
| 11 | Jerry Paige | 2.784 | 2011 | |
| 12 | Ju-yi Gu | 2.910 | 2010 | |
| 13 | John Martin | 2.947 | 2014 | |
| 14 | Rob King | 2.954 | 2012 | |
| 15 | Raymond Gregg | 2.970 | 2026 | |
| 16 | Sandro Gonzáles | 2.995 | 2015 | |
| 17 | Santiago González | 3.018 | 2020 | |
| 18 | Ramón Cruz | 3.065 | 2011 | |
| 19 | Irving Baker | 3.083 | 2013 | |
| 20 | Cordell Hensley | 3.113 | 2012 | |
| 21 | Walt Thompson | 3.119 | 2013 | |
| 22 | Luis Féliz | 3.127 | 2023 | |
| 23 | Luis Franco | 3.132 | 2008 | |
| 24 | Román Zamora# | 3.155 | 2036 | |
| 25 | Irving Baker | 3.168 | 2014 | |
| 26 | Armando Rodríguez | 3.179 | 2027 | |
| 27 | Esteban Gonzáles | 3.217 | 2019 | |
| 28 | Dave Watkins | 3.219 | 2026 | |
| 29 | Ángel Rodríguez | 3.252 | 2012 | |
| 30 | Ramón Méndez | 3.254 | 2010 | |
| 31 | Yin-zhen Zhan | 3.266 | 2008 | |
| 32 | Tim Sullivan | 3.296 | 2011 | |
| 33 | Santiago González | 3.300 | 2019 | |
| 34 | Erwin Entwistle | 3.311 | 2026 | |
| 35 | Nathan Seymour | 3.342 | 2024 | |
| 35 | Nick Herbert | 3.342 | 2010 | |
| 37 | Don Wiggins | 3.349 | 2024 | |
| 38 | Carlos Ruíz | 3.350 | 2019 | |
| 39 | Javier González | 3.362 | 2025 | |
| 40 | António Gálvez | 3.394 | 2013 | |
| 41 | Armando Rodríguez | 3.397 | 2026 | |
| 42 | Ramón Quintero | 3.410 | 2026 | |
| 43 | Yajirobei Endo | 3.415 | 2015 | |
| 43 | Cristóbal Santos | 3.415 | 2016 | |
| 45 | Hokusai Nakashima | 3.437 | 2018 | |
| 46 | Júlio Quintana | 3.492 | 2010 | |
| 47 | Duane Deal# | 3.514 | 2030 | |
| 48 | Gildun Ouakili | 3.527 | 2019 | |
| 49 | Matt Barlow | 3.536 | 2029 | |
| 50 | Rod Day | 3.544 | 2026 | |
| 51 | Fred Bennett | 3.558 | 2012 | |
| 52 | Sandro Gonzáles | 3.561 | 2016 | |
| 53 | Steve Harris# | 3.564 | 2036 | |
| 54 | Bart Hughes# | 3.582 | 2036 | |
| 55 | Robbie Daniel | 3.591 | 2022 | |
| 56 | Steve Floyd | 3.624 | 2025 | |
| 57 | Jason MacKnight# | 3.638 | 2029 | |
| 58 | Jorge Ruíz | 3.644 | 2023 | |
| 59 | Tom Land# | 3.650 | 2034 | |
| 60 | Juan Aguilar | 3.652 | 2019 | |
| 61 | Nathan Seymour | 3.659 | 2026 | |
| 62 | Kiyoshi Yamaguchi | 3.666 | 2010 | |
| 63 | Juan Martínez# | 3.670 | 2027 | |
| 64 | Ramón Quintero | 3.676 | 2025 | |
| 65 | David Evans | 3.687 | 2011 | |
| 66 | Jason MacKnight# | 3.716 | 2028 | |
| 67 | Clarence Skerratt | 3.729 | 2024 | |
| 68 | Pedro Mendoza | 3.730 | 2026 | |
| 69 | Won-sup Yi | 3.731 | 2014 | |
| 70 | Mal Windham | 3.770 | 2010 | |
| 71 | Mike Waddingham# | 3.773 | 2038 | |
| 72 | Marcos Urbina | 3.779 | 2014 | |
| 73 | Júlio González# | 3.787 | 2025 | |
| 74 | Albert Wallace | 3.792 | 2015 | |
| 75 | José Reyes | 3.809 | 2008 | |
| 76 | Araga Yeluri# | 3.813 | 2034 | |
| 77 | Cecil Bonekamp | 3.821 | 2021 | |
| 77 | Armand Calazzo | 3.821 | 2023 | |
| 79 | Lorenzo López | 3.834 | 2017 | |
| 80 | Javier González | 3.850 | 2027 | |
| 81 | Javier Rodríguez# | 3.857 | 2037 | |
| 82 | Lane Lund | 3.870 | 2029 | |
| 83 | Raúl Vélez# | 3.877 | 2037 | |
| 84 | Luis Franco | 3.884 | 2010 | |
| 85 | Bill Parry# | 3.886 | 2031 | |
| 86 | Erwin Entwistle | 3.896 | 2025 | |
| 87 | Gilberto Barrera | 3.911 | 2018 | |
| 88 | Kian Mac | 3.913 | 2007 | |
| 89 | Mario Peńa | 3.918 | 2013 | |
| 90 | Tom Land# | 3.919 | 2033 | |
| 90 | Dave Lewis | 3.919 | 2010 | |
| 92 | Nathan Seymour | 3.923 | 2021 | |
| 93 | Ramón López | 3.930 | 2014 | |
| 94 | Dwight Livingston# | 3.935 | 2026 | |
| 95 | Santiago González | 3.940 | 2018 | |
| 96 | Keith O'Higgins# | 3.954 | 2032 | |
| 97 | Yoshitoki Shibata | 3.960 | 2018 | |
| 98 | Gerald Collins# | 3.985 | 2034 | |
| 99 | Bartolo González | 3.987 | 2015 | |
| 100 | Aaron Palmer | 3.992 | 2022 |
