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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 | Michael Machen# | 2.47 | 2029-2032 | |
| 3 | Tim Powell | 2.48 | 2015-2020 | |
| 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 | Gary Bailey | 2.85 | 2015-2032 | |
| 9 | Ron Manning# | 2.86 | 2029-2032 | |
| 9 | Addie Samson# | 2.86 | 2024-2027 | |
| 11 | Luis Peña# | 2.90 | 2025-2032 | |
| 12 | Javier Castillo# | 2.95 | 2024-2032 | |
| 13 | Jeff Territt# | 3.05 | 2020-2030 | |
| 14 | Chip Bishop | 3.09 | 2015-2030 | |
| 15 | Eduardo Molina# | 3.12 | 2022-2025 | |
| 16 | Sexto Rodríguez | 3.17 | 2015-2025 | |
| 16 | Johnny Joyce | 3.17 | 2015-2019 | |
| 18 | George Frazier# | 3.23 | 2017-2032 | |
| 19 | Alfonso Zapata# | 3.24 | 2022-2025 | |
| 20 | Alexis Zambaco# | 3.31 | 2028-2032 | |
| 21 | Edison Larson# | 3.37 | 2020-2029 | |
| 22 | Mathies Pilegaard | 3.41 | 2015-2025 | |
| 22 | Greg White | 3.41 | 2015-2028 | |
| 22 | John Alvarado | 3.41 | 2017-2021 | |
| 25 | Lorenzo Sánchez# | 3.42 | 2020-2029 | |
| 26 | Lou Meadows | 3.43 | 2016-2029 | |
| 27 | Jorge Castillo | 3.44 | 2020-2030 | |
| 28 | Cris Herrera# | 3.48 | 2024-2032 | |
| 29 | Roger Garrett | 3.53 | 2016-2024 | |
| 30 | John Brown | 3.54 | 2017-2031 | |
| 31 | Dan Mitchell# | 3.61 | 2020-2025 | |
| 32 | Myles Wilkerson# | 3.63 | 2026-2032 | |
| 33 | José Alaniz# | 3.65 | 2016-2030 | |
| 33 | Roderick Rhodes | 3.65 | 2015-2030 | |
| 35 | Jon Briddon# | 3.71 | 2022-2032 | |
| 36 | Neil Gilliam | 3.73 | 2021-2026 | |
| 36 | Woody Carlson# | 3.73 | 2020-2032 | |
| 38 | Panda Montana# | 3.76 | 2029-2032 | |
| 38 | Ronald Harmon | 3.76 | 2016-2029 | |
| 40 | Art Adams# | 3.78 | 2021-2030 | |
| 41 | Jared Cox | 3.80 | 2016-2022 | |
| 42 | William MacKnight# | 3.81 | 2022-2028 | |
| 42 | Paul Lowery | 3.81 | 2015-2020 | |
| 44 | Adrián Fierro# | 3.82 | 2020-2032 | |
| 45 | Ryan Peterson# | 3.87 | 2026-2030 | |
| 45 | Juan Montoya# | 3.87 | 2025-2031 | |
| 47 | Rusty Swanson# | 3.89 | 2026-2029 | |
| 48 | Matt Harris | 3.92 | 2020-2031 | |
| 49 | Jesús Tejeda# | 3.98 | 2023-2032 | |
| 50 | Shunen Takahashi# | 4.05 | 2023-2030 | |
| 51 | Benny York | 4.07 | 2015-2029 | |
| 52 | Leroy Moody# | 4.10 | 2025-2032 | |
| 53 | Alfonso Miranda# | 4.12 | 2022-2031 | |
| 54 | António Castillo# | 4.13 | 2027-2032 | |
| 55 | Collin Hill# | 4.14 | 2020-2028 | |
| 56 | Jim Roberts | 4.15 | 2016-2020 | |
| 57 | António Cruz | 4.19 | 2015-2020 | |
| 58 | Melvin Haney# | 4.26 | 2023-2030 | |
| 59 | Kenshin Koike | 4.28 | 2018-2032 | |
| 59 | Austin Stewart | 4.28 | 2022-2030 | |
| 61 | Bobby Swain# | 4.31 | 2024-2032 | |
| 62 | Leslie Brooks | 4.37 | 2021-2030 | |
| 63 | Félix Jiménez | 4.41 | 2022-2026 | |
| 64 | Yusuke Chikafuji# | 4.44 | 2024-2032 | |
| 65 | Leroy Picot | 4.46 | 2025-2032 | |
| 66 | Christian Patrick | 4.47 | 2019-2028 | |
| 66 | José Guzmán# | 4.47 | 2024-2032 | |
| 68 | Gunner Hardy | 4.63 | 2016-2028 | |
| 69 | David Collingwood# | 4.71 | 2018-2031 | |
| 70 | Kent Hubbard | 4.72 | 2015-2020 | |
| 71 | Bob Compton | 4.89 | 2015-2023 | |
| 72 | Doug Green# | 4.95 | 2022-2032 | |
| 73 | Elvin Brooks | 5.18 | 2017-2028 |
