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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# | 2.29 | 2029-2033 | |
| 3 | Tim Powell | 2.48 | 2015-2020 | |
| 4 | Shigemasa Horiuchi | 2.65 | 2017-2031 | |
| 5 | Walt Coffman# | 2.67 | 2026-2033 | |
| 6 | Carlos Sánchez# | 2.78 | 2021-2028 | |
| 7 | Gary Bailey | 2.85 | 2015-2032 | |
| 8 | Addie Samson# | 2.86 | 2024-2027 | |
| 9 | Luis Peña# | 2.90 | 2025-2032 | |
| 10 | Jeff Territt# | 3.05 | 2020-2030 | |
| 11 | Chip Bishop | 3.09 | 2015-2030 | |
| 12 | Eduardo Molina# | 3.12 | 2022-2033 | |
| 13 | Alexis Zambaco# | 3.15 | 2028-2033 | |
| 14 | Sexto Rodríguez | 3.17 | 2015-2025 | |
| 14 | Johnny Joyce | 3.17 | 2015-2019 | |
| 16 | George Frazier# | 3.23 | 2017-2032 | |
| 17 | Edison Larson# | 3.37 | 2020-2029 | |
| 18 | Mathies Pilegaard | 3.41 | 2015-2025 | |
| 18 | Greg White | 3.41 | 2015-2028 | |
| 18 | Alfonso Zapata# | 3.41 | 2022-2033 | |
| 18 | John Alvarado | 3.41 | 2017-2021 | |
| 22 | Lorenzo Sánchez# | 3.42 | 2020-2029 | |
| 23 | Lou Meadows | 3.43 | 2016-2029 | |
| 24 | Cris Herrera# | 3.48 | 2024-2032 | |
| 25 | Mal Houser# | 3.50 | 2029-2033 | |
| 26 | Quintiliano Seixal# | 3.52 | 2025-2033 | |
| 27 | Roger Garrett | 3.53 | 2016-2024 | |
| 28 | John Brown | 3.54 | 2017-2031 | |
| 29 | Dan Mitchell | 3.61 | 2020-2025 | |
| 30 | Myles Wilkerson# | 3.62 | 2026-2033 | |
| 31 | José Alaniz# | 3.65 | 2016-2030 | |
| 31 | Roderick Rhodes | 3.65 | 2015-2030 | |
| 33 | Prince Michael Jackson# | 3.66 | 2029-2033 | |
| 34 | Jon Briddon# | 3.71 | 2022-2032 | |
| 35 | Panda Montana# | 3.72 | 2029-2033 | |
| 36 | Ronald Harmon | 3.76 | 2016-2029 | |
| 37 | Woody Carlson# | 3.78 | 2020-2033 | |
| 37 | Art Adams# | 3.78 | 2021-2030 | |
| 39 | Jared Cox | 3.80 | 2016-2022 | |
| 40 | William MacKnight# | 3.81 | 2022-2028 | |
| 40 | Paul Lowery | 3.81 | 2015-2020 | |
| 40 | Adrián Fierro# | 3.81 | 2020-2033 | |
| 43 | Ryan Peterson# | 3.87 | 2026-2030 | |
| 43 | Juan Montoya# | 3.87 | 2025-2031 | |
| 45 | Matt Harris | 3.92 | 2020-2031 | |
| 46 | Jesús Tejeda# | 3.97 | 2023-2033 | |
| 47 | Shunen Takahashi# | 4.05 | 2023-2030 | |
| 48 | Benny York | 4.07 | 2015-2029 | |
| 49 | Rusty Swanson# | 4.08 | 2026-2033 | |
| 50 | Leroy Moody# | 4.10 | 2025-2032 | |
| 51 | Alfonso Miranda# | 4.12 | 2022-2031 | |
| 52 | António Castillo# | 4.13 | 2027-2033 | |
| 52 | Sukejuro Yokoyama# | 4.13 | 2025-2033 | |
| 54 | Collin Hill# | 4.14 | 2020-2028 | |
| 55 | Jim Roberts | 4.15 | 2016-2020 | |
| 56 | Melvin Haney# | 4.26 | 2023-2030 | |
| 57 | Kenshin Koike | 4.28 | 2018-2032 | |
| 57 | Austin Stewart | 4.28 | 2022-2030 | |
| 59 | Bobby Swain | 4.31 | 2024-2032 | |
| 60 | Félix Jiménez | 4.41 | 2022-2026 | |
| 61 | Yusuke Chikafuji# | 4.44 | 2024-2032 | |
| 62 | Merlin Bassett# | 4.45 | 2029-2033 | |
| 63 | Christian Patrick | 4.47 | 2019-2028 | |
| 63 | José Guzmán# | 4.47 | 2024-2032 | |
| 65 | Gunner Hardy | 4.63 | 2016-2028 | |
| 66 | David Collingwood | 4.71 | 2018-2031 | |
| 67 | Kent Hubbard | 4.72 | 2015-2020 | |
| 68 | Bob Compton | 4.89 | 2015-2023 | |
| 69 | Doug Green# | 4.95 | 2022-2032 | |
| 70 | Elvin Brooks | 5.18 | 2017-2028 |
