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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Roy Robinson | 1.56 | 2013-2023 | |
| 2 | Todd Hines# | 2.25 | 2018-2028 | |
| 3 | Sozen Raikatuji | 2.59 | 2016-2023 | |
| 3 | John Coleman | 2.59 | 2013-2025 | |
| 5 | Ryan Davis | 2.62 | 2015-2026 | |
| 6 | Ralph McKinney# | 2.64 | 2019-2028 | |
| 7 | Devin Hinton | 2.66 | 2013-2023 | |
| 8 | Gene Kirkland# | 2.67 | 2018-2028 | |
| 9 | Jesús Gonzáles# | 2.73 | 2019-2028 | |
| 9 | Lúcio Sánchez# | 2.73 | 2017-2028 | |
| 11 | John Dempsey# | 2.76 | 2022-2028 | |
| 12 | Ryan Ray | 2.79 | 2013-2021 | |
| 13 | António Vega | 2.80 | 2013-2023 | |
| 14 | Jim Eliott | 2.83 | 2014-2025 | |
| 15 | Guillermo García | 2.85 | 2013-2021 | |
| 16 | Bill Oulton# | 2.88 | 2021-2028 | |
| 17 | Javier Ramírez | 2.89 | 2018-2027 | |
| 18 | Jorge Aguirre# | 2.90 | 2015-2028 | |
| 19 | Pedro Alejándrez# | 2.91 | 2021-2028 | |
| 20 | Yuri Volkers | 2.92 | 2013-2021 | |
| 21 | Jesús Caldero# | 2.93 | 2018-2027 | |
| 22 | Bruce Wright# | 2.99 | 2020-2028 | |
| 23 | José Hernández | 3.02 | 2013-2023 | |
| 24 | Kyle Lewis | 3.03 | 2016-2026 | |
| 25 | Edwin Ellis | 3.04 | 2013-2019 | |
| 26 | Vincent Hall# | 3.07 | 2020-2027 | |
| 27 | Cordell Wilson# | 3.08 | 2019-2028 | |
| 28 | John Wilkins# | 3.13 | 2013-2028 | |
| 29 | Cris Mendoza# | 3.15 | 2013-2028 | |
| 30 | Chester Henry | 3.16 | 2016-2023 | |
| 30 | Wayne Craig# | 3.16 | 2018-2028 | |
| 30 | John Kaufman# | 3.16 | 2017-2028 | |
| 33 | Manuel Rojas# | 3.17 | 2018-2028 | |
| 34 | Ken Hinkle | 3.19 | 2013-2026 | |
| 35 | Pedro Ritodíaz | 3.20 | 2013-2024 | |
| 36 | Ramón Ortega# | 3.21 | 2013-2028 | |
| 37 | Tom Reynolds# | 3.22 | 2015-2028 | |
| 38 | Edgardo Marín# | 3.24 | 2013-2028 | |
| 39 | Yoriyoshi Yamamoto | 3.25 | 2016-2026 | |
| 39 | Ole Kos | 3.25 | 2018-2027 | |
| 41 | Juan Gusmán# | 3.26 | 2024-2028 | |
| 42 | Bartolomeu Lio# | 3.30 | 2018-2028 | |
| 43 | Alec Pittman# | 3.33 | 2016-2028 | |
| 44 | Clancy McKinney# | 3.35 | 2023-2028 | |
| 45 | Earnest Casey | 3.37 | 2018-2025 | |
| 46 | Adrián Fierro# | 3.40 | 2018-2026 | |
| 47 | Juan Júlio | 3.45 | 2013-2026 | |
| 48 | Eduardo Díaz# | 3.48 | 2021-2028 | |
| 49 | Curtis Fields | 3.49 | 2016-2024 | |
| 50 | Fraser Cuevas# | 3.50 | 2020-2028 | |
| 51 | Enrique Cortéz# | 3.52 | 2022-2027 | |
| 52 | Pat Farrell | 3.53 | 2013-2022 | |
| 53 | George Frazier# | 3.54 | 2019-2027 | |
| 54 | Billy Crawford | 3.55 | 2014-2025 | |
| 55 | Raúl Areola# | 3.56 | 2020-2028 | |
| 56 | Reid Garner | 3.59 | 2015-2022 | |
| 57 | William Johnson | 3.62 | 2013-2018 | |
| 58 | Wayne Hurst# | 3.63 | 2015-2024 | |
| 59 | Burt Booth | 3.67 | 2013-2026 | |
| 60 | Christian Bates | 3.70 | 2019-2022 | |
| 61 | Josef van der Poel# | 3.71 | 2019-2028 | |
| 61 | Juan Torres# | 3.71 | 2023-2028 | |
| 63 | Kirby Brown# | 3.72 | 2017-2028 | |
| 64 | Kirby Buckner# | 3.73 | 2025-2028 | |
| 65 | Ilie Paunescu# | 3.79 | 2016-2028 | |
| 66 | José Flores# | 3.80 | 2019-2028 | |
| 67 | Bill Fletcher# | 3.81 | 2018-2025 | |
| 67 | Luis Flores# | 3.81 | 2024-2028 | |
| 69 | Miguel Castillo | 3.82 | 2013-2020 | |
| 70 | Carlos Mata | 3.90 | 2018-2021 | |
| 71 | Chris Rogers# | 3.92 | 2015-2027 | |
| 72 | Bill Grange | 3.94 | 2013-2017 | |
| 73 | Mario Peńa | 3.98 | 2013-2023 | |
| 74 | Peter Rivers | 3.99 | 2013-2020 | |
| 75 | Juan Pérez# | 4.02 | 2020-2028 | |
| 76 | Enrique Magana | 4.04 | 2013-2019 | |
| 77 | Vern Camp | 4.08 | 2013-2022 | |
| 78 | Makoto Kato# | 4.17 | 2019-2024 | |
| 79 | Pedro Martínez | 4.28 | 2013-2017 | |
| 80 | Yin-fat Foong# | 4.36 | 2017-2027 | |
| 80 | Cole Hall | 4.36 | 2013-2027 | |
| 82 | Christian Pitts | 4.48 | 2015-2025 | |
| 83 | Michael Battle | 4.58 | 2014-2024 | |
| 84 | Kaluka Wene# | 4.59 | 2016-2028 | |
| 85 | Edgar Martínez | 4.78 | 2013-2021 | |
| 86 | Pedro Ramírez# | 4.86 | 2023-2028 | |
| 87 | Marshall Edwards | 4.99 | 2013-2022 | |
| 88 | Masood Thind | 5.23 | 2014-2018 | |
| 89 | Armando Hernández | 5.73 | 2013-2018 |
