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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Tim Powell | 2.48 | 2015-2020 | |
| 2 | Michael Machen# | 2.63 | 2029-2036 | |
| 3 | Shigemasa Horiuchi* | 2.65 | 2017-2031 | |
| 4 | Carlos Sánchez | 2.78 | 2021-2028 | |
| 5 | Gary Bailey | 2.85 | 2015-2032 | |
| 6 | Walt Coffman | 2.90 | 2026-2035 | |
| 7 | Chip Bishop | 3.09 | 2015-2030 | |
| 8 | Sexto Rodríguez | 3.17 | 2015-2025 | |
| 9 | Alexis Zambaco# | 3.20 | 2028-2039 | |
| 10 | Jeff Territt | 3.22 | 2020-2035 | |
| 11 | George Frazier | 3.23 | 2017-2037 | |
| 12 | Will Hunting# | 3.36 | 2030-2037 | |
| 13 | Greg White | 3.41 | 2015-2028 | |
| 13 | Alfonso Zapata | 3.41 | 2022-2033 | |
| 15 | Lou Meadows | 3.43 | 2016-2029 | |
| 16 | Hermenegildo Beliago# | 3.44 | 2027-2039 | |
| 17 | John Brown | 3.54 | 2017-2031 | |
| 18 | Cris Herrera | 3.56 | 2024-2034 | |
| 19 | Shawn Williams# | 3.61 | 2030-2039 | |
| 20 | Myles Wilkerson | 3.62 | 2026-2033 | |
| 21 | Quintiliano Seixal | 3.63 | 2025-2036 | |
| 22 | José Alaniz | 3.65 | 2016-2030 | |
| 22 | Roderick Rhodes | 3.65 | 2015-2030 | |
| 24 | Panda Montana# | 3.71 | 2029-2035 | |
| 24 | Jon Briddon | 3.71 | 2022-2032 | |
| 24 | Edison Larson | 3.71 | 2020-2039 | |
| 27 | Mal Houser# | 3.72 | 2029-2038 | |
| 28 | Luis Díaz# | 3.74 | 2033-2039 | |
| 29 | Woody Carlson | 3.78 | 2020-2033 | |
| 29 | Art Adams | 3.78 | 2021-2030 | |
| 31 | Jared Cox | 3.80 | 2016-2022 | |
| 32 | William MacKnight | 3.81 | 2022-2028 | |
| 32 | Paul Lowery | 3.81 | 2015-2020 | |
| 34 | Adrián Fierro | 3.85 | 2020-2034 | |
| 35 | Zalontae Hillary# | 3.89 | 2031-2038 | |
| 36 | Matt Harris | 3.92 | 2020-2031 | |
| 37 | Nolan Howard# | 3.93 | 2034-2039 | |
| 37 | Armando Romano# | 3.93 | 2033-2038 | |
| 37 | Mark Collingwood# | 3.93 | 2031-2039 | |
| 40 | Marvin Martin# | 3.94 | 2025-2039 | |
| 41 | Ryan Peterson | 3.95 | 2026-2036 | |
| 42 | Domingo Ramírez# | 4.00 | 2023-2039 | |
| 43 | Benny York | 4.07 | 2015-2029 | |
| 44 | Rusty Swanson | 4.09 | 2026-2035 | |
| 45 | Leroy Moody | 4.10 | 2025-2032 | |
| 46 | Alfonso Miranda | 4.12 | 2022-2031 | |
| 46 | Shunen Takahashi | 4.12 | 2023-2035 | |
| 48 | Collin Hill | 4.14 | 2020-2028 | |
| 49 | Robbie Betchley# | 4.17 | 2030-2039 | |
| 50 | António Castillo | 4.21 | 2027-2038 | |
| 51 | Juan Montoya | 4.23 | 2025-2036 | |
| 52 | Román Mejía# | 4.25 | 2034-2039 | |
| 53 | Melvin Haney | 4.26 | 2023-2030 | |
| 54 | Kenshin Koike | 4.28 | 2018-2032 | |
| 55 | José Ruíz# | 4.43 | 2035-2039 | |
| 56 | Yusuke Chikafuji | 4.44 | 2024-2032 | |
| 57 | Pete Rhue# | 4.46 | 2032-2039 | |
| 58 | Christian Patrick | 4.47 | 2019-2028 | |
| 59 | Gunner Hardy | 4.63 | 2016-2028 | |
| 60 | Manny Castro | 4.66 | 2030-2037 | |
| 61 | David Collingwood | 4.71 | 2018-2031 | |
| 62 | Harry Stuterberg# | 4.76 | 2034-2039 | |
| 63 | Bob Compton | 4.89 | 2015-2023 | |
| 64 | Merlin Bassett | 4.90 | 2029-2038 | |
| 65 | Doug Green | 4.95 | 2022-2032 |
