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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Pedro Ritodíaz | 2.27 | 2015-2024 | |
| 2 | Tim Powell | 2.48 | 2015-2020 | |
| 3 | Michael Machen# | 2.51 | 2029-2031 | |
| 4 | Shigemasa Horiuchi# | 2.65 | 2017-2031 | |
| 5 | Walt Coffman# | 2.67 | 2026-2029 | |
| 6 | Pat Farrell | 2.71 | 2015-2023 | |
| 7 | Carlos Sánchez# | 2.78 | 2021-2028 | |
| 8 | Dave Goode | 2.81 | 2019-2025 | |
| 9 | Gary Bailey# | 2.83 | 2015-2031 | |
| 10 | Addie Samson# | 2.86 | 2024-2027 | |
| 11 | Luis Peña# | 2.90 | 2025-2031 | |
| 12 | Jeff Territt# | 3.05 | 2020-2030 | |
| 13 | Chip Bishop | 3.09 | 2015-2030 | |
| 14 | Eduardo Molina# | 3.12 | 2022-2025 | |
| 15 | Sexto Rodríguez | 3.17 | 2015-2025 | |
| 15 | Johnny Joyce | 3.17 | 2015-2019 | |
| 17 | Alfonso Zapata# | 3.24 | 2022-2025 | |
| 18 | Alexis Zambaco# | 3.32 | 2028-2031 | |
| 19 | Edison Larson# | 3.37 | 2020-2029 | |
| 20 | Mathies Pilegaard | 3.41 | 2015-2025 | |
| 20 | Greg White | 3.41 | 2015-2028 | |
| 20 | John Alvarado | 3.41 | 2017-2021 | |
| 23 | Chuck Steele | 3.42 | 2018-2024 | |
| 23 | Lorenzo Sánchez# | 3.42 | 2020-2029 | |
| 25 | Lou Meadows | 3.43 | 2016-2029 | |
| 26 | George Frazier# | 3.44 | 2017-2031 | |
| 26 | Jorge Castillo# | 3.44 | 2020-2030 | |
| 28 | Jeff Bradshaw# | 3.48 | 2024-2030 | |
| 28 | Cris Herrera# | 3.48 | 2024-2030 | |
| 30 | Sukejuro Yokoyama# | 3.52 | 2025-2031 | |
| 31 | Roger Garrett | 3.53 | 2016-2024 | |
| 32 | John Brown# | 3.54 | 2017-2031 | |
| 33 | Dan Mitchell# | 3.61 | 2020-2025 | |
| 34 | José Alaniz# | 3.65 | 2016-2030 | |
| 34 | Roderick Rhodes | 3.65 | 2015-2030 | |
| 34 | Myles Wilkerson# | 3.65 | 2026-2031 | |
| 37 | Henry Hall | 3.68 | 2017-2025 | |
| 38 | Neil Gilliam# | 3.73 | 2021-2026 | |
| 39 | Ronald Harmon | 3.76 | 2016-2029 | |
| 39 | Jon Briddon# | 3.76 | 2022-2031 | |
| 41 | Adrián Fierro# | 3.77 | 2020-2031 | |
| 42 | Woody Carlson# | 3.78 | 2020-2027 | |
| 42 | Art Adams# | 3.78 | 2021-2030 | |
| 44 | Jared Cox | 3.80 | 2016-2022 | |
| 45 | William MacKnight# | 3.81 | 2022-2028 | |
| 45 | Paul Lowery | 3.81 | 2015-2020 | |
| 47 | Ryan Peterson# | 3.87 | 2026-2030 | |
| 47 | Juan Montoya# | 3.87 | 2025-2031 | |
| 49 | Rusty Swanson# | 3.89 | 2026-2029 | |
| 50 | Matt Harris# | 3.92 | 2020-2031 | |
| 51 | Hunter Wilson# | 3.94 | 2022-2027 | |
| 52 | Jesús Tejeda# | 3.98 | 2023-2027 | |
| 53 | Leroy Moody# | 4.01 | 2025-2031 | |
| 54 | Shunen Takahashi# | 4.05 | 2023-2030 | |
| 55 | Benny York | 4.07 | 2015-2029 | |
| 56 | Alfonso Miranda# | 4.12 | 2022-2031 | |
| 56 | José Guzmán# | 4.12 | 2024-2027 | |
| 58 | Collin Hill# | 4.14 | 2020-2028 | |
| 59 | António Castillo# | 4.15 | 2027-2031 | |
| 59 | Jim Roberts | 4.15 | 2016-2020 | |
| 61 | Doug Green# | 4.16 | 2022-2030 | |
| 62 | António Cruz | 4.19 | 2015-2020 | |
| 63 | Leroy Picot# | 4.20 | 2025-2029 | |
| 63 | Roderick Draper | 4.20 | 2015-2021 | |
| 65 | Melvin Haney# | 4.26 | 2023-2030 | |
| 66 | Kenshin Koike# | 4.27 | 2018-2027 | |
| 67 | Austin Stewart# | 4.28 | 2022-2030 | |
| 68 | Leslie Brooks# | 4.37 | 2021-2030 | |
| 69 | Yusuke Chikafuji# | 4.39 | 2024-2031 | |
| 70 | Félix Jiménez | 4.41 | 2022-2026 | |
| 71 | Bobby Swain# | 4.46 | 2024-2029 | |
| 72 | Christian Patrick | 4.47 | 2019-2028 | |
| 73 | Gunner Hardy# | 4.63 | 2016-2028 | |
| 74 | David Collingwood# | 4.71 | 2018-2031 | |
| 75 | Kent Hubbard | 4.72 | 2015-2020 | |
| 76 | Bob Compton | 4.89 | 2015-2023 | |
| 77 | Guillermo Pérez | 4.93 | 2017-2025 | |
| 78 | Elvin Brooks | 5.18 | 2017-2028 | |
| 79 | Britt Yates | 5.34 | 2016-2023 | |
| 80 | Glenn West | 5.57 | 2020-2025 | |
| 81 | Ryan Draper | 6.43 | 2020-2024 |
