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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Jorge Aguirre* | 1.112 | 2020 | |
| 2 | Jim Eliott* | 1.402 | 2019 | |
| 3 | Guillermo García | 1.415 | 2014 | |
| 4 | Ryan Davis* | 1.476 | 2017 | |
| 5 | Todd Hines* | 1.483 | 2021 | |
| 6 | Guillermo García | 1.573 | 2015 | |
| 7 | Noud Taaij# | 1.585 | 2049 | |
| 8 | Todd Hines* | 1.592 | 2018 | |
| 9 | Kenji Aoki | 1.656 | 2035 | |
| 10 | Miguel Rubia | 1.703 | 2035 | |
| 11 | Edwin Ellis | 1.719 | 2015 | |
| 12 | Todd Hines* | 1.815 | 2019 | |
| 13 | Iiri Lahti# | 1.831 | 2051 | |
| 14 | Jorge Aguirre* | 1.849 | 2018 | |
| 15 | Alec Pittman | 1.899 | 2019 | |
| 16 | Andrew Moody | 1.919 | 2035 | |
| 17 | Bill Oulton | 1.936 | 2025 | |
| 18 | Jim Eliott* | 1.948 | 2017 | |
| 19 | Bruce Wright | 1.952 | 2023 | |
| 20 | Mario Rosales# | 1.979 | 2054 | |
| 21 | Noud Taaij# | 1.986 | 2051 | |
| 22 | Charles Dobson | 2.010 | 2028 | |
| 23 | Lúcio Sánchez* | 2.028 | 2023 | |
| 24 | Roderick Rhodes | 2.038 | 2024 | |
| 25 | Jesús Vidro | 2.048 | 2039 | |
| 26 | Tom Reynolds* | 2.063 | 2020 | |
| 27 | Jim Eliott* | 2.069 | 2018 | |
| 28 | Mike Donovan | 2.096 | 2041 | |
| 28 | Jesús Gonzáles* | 2.096 | 2028 | |
| 30 | Wayne Craig | 2.103 | 2020 | |
| 31 | Jesús Gonzáles* | 2.110 | 2021 | |
| 32 | Raúl Romero | 2.113 | 2035 | |
| 33 | Tetsuzan Kaneko | 2.119 | 2018 | |
| 34 | Ramón Ortega* | 2.124 | 2020 | |
| 35 | Kyle Lewis | 2.126 | 2019 | |
| 36 | Cris Mendoza | 2.154 | 2017 | |
| 37 | John Wilkins* | 2.164 | 2019 | |
| 38 | Ryan Davis* | 2.166 | 2015 | |
| 39 | Lúcio Sánchez* | 2.173 | 2026 | |
| 40 | Guillermo García | 2.178 | 2013 | |
| 41 | Lúcio Colón# | 2.195 | 2052 | |
| 42 | Ralph McKinney* | 2.197 | 2023 | |
| 42 | Tony Alfonso* | 2.197 | 2041 | |
| 44 | Sozen Raikatuji* | 2.204 | 2017 | |
| 45 | Manuel Rojas | 2.214 | 2018 | |
| 46 | Cordell Wilson | 2.222 | 2022 | |
| 47 | Piotr Oja | 2.223 | 2032 | |
| 48 | Yoriyoshi Yamamoto | 2.224 | 2018 | |
| 49 | José Hernández | 2.225 | 2016 | |
| 50 | Kyle Lewis | 2.242 | 2018 | |
| 50 | Jesús Franco | 2.242 | 2030 | |
| 52 | John Kaufman* | 2.244 | 2022 | |
| 53 | Enrique Castro | 2.250 | 2033 | |
| 53 | Wes Hamm* | 2.250 | 2029 | |
| 53 | Sozen Raikatuji* | 2.250 | 2021 | |
| 56 | Tom Reynolds* | 2.255 | 2025 | |
| 56 | Lúcio Sánchez* | 2.255 | 2022 | |
| 58 | Cordell Wilson | 2.258 | 2026 | |
| 59 | Jim Eliott* | 2.263 | 2020 | |
| 60 | Ryan Ray | 2.269 | 2013 | |
| 61 | Javier Ramírez | 2.272 | 2022 | |
| 62 | Martin Luther# | 2.276 | 2053 | |
| 62 | Chester Henry | 2.276 | 2018 | |
| 64 | Javier Mora | 2.293 | 2024 | |
| 65 | Paul Díaz | 2.297 | 2022 | |
| 66 | Curtis Fields | 2.300 | 2017 | |
| 66 | Ralph McKinney* | 2.300 | 2026 | |
| 68 | Eric Matson* | 2.314 | 2035 | |
| 69 | Pedro Alejándrez* | 2.319 | 2030 | |
| 70 | Ramón Ortega* | 2.324 | 2018 | |
| 71 | Charles Dobson | 2.325 | 2027 | |
| 72 | Edgardo Marín | 2.326 | 2015 | |
| 73 | Cris Mendoza | 2.339 | 2016 | |
| 74 | Kyle Boddy | 2.341 | 2028 | |
| 75 | António Cruz | 2.354 | 2013 | |
| 76 | Lúcio Sánchez* | 2.355 | 2027 | |
| 77 | Eddie Kop* | 2.356 | 2029 | |
| 78 | José Hernández | 2.357 | 2017 | |
| 79 | Ralph McKinney* | 2.361 | 2020 | |
| 80 | Jesús Franco | 2.363 | 2027 | |
| 81 | John Wilkins* | 2.382 | 2013 | |
| 81 | Sozen Raikatuji* | 2.382 | 2019 | |
| 83 | John Kaufman* | 2.388 | 2019 | |
| 84 | Bruce Wright | 2.390 | 2025 | |
| 85 | Vincent Hall | 2.398 | 2022 | |
| 85 | António Solís | 2.398 | 2013 | |
| 87 | Eric Matson* | 2.403 | 2036 | |
| 88 | Aurelio López | 2.407 | 2024 | |
| 89 | Yoriyoshi Yamamoto | 2.408 | 2020 | |
| 90 | Guillermo García | 2.409 | 2017 | |
| 91 | Ratko Peric# | 2.412 | 2043 | |
| 92 | Pedro Alejándrez* | 2.415 | 2028 | |
| 93 | Virgil Dickerson# | 2.426 | 2045 | |
| 94 | Sozen Raikatuji* | 2.432 | 2022 | |
| 95 | Ramón Ortega* | 2.438 | 2019 | |
| 96 | Eric Matson* | 2.440 | 2032 | |
| 97 | Kenny Aarnoutse | 2.443 | 2035 | |
| 98 | Cris Mendoza | 2.445 | 2018 | |
| 99 | Yaichiro Shini# | 2.455 | 2054 | |
| 99 | Hermenegildo Beliago | 2.455 | 2032 |
