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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Tim Powell | 2.479 | 2015-2020 | |
| 2 | Michael Machen | 2.633 | 2029-2041 | |
| 3 | Shigemasa Horiuchi* | 2.648 | 2017-2031 | |
| 4 | Carlos Sánchez | 2.780 | 2021-2028 | |
| 5 | Gary Bailey* | 2.853 | 2015-2032 | |
| 6 | Walt Coffman* | 2.900 | 2026-2035 | |
| 7 | Kevin Nogilny# | 3.073 | 2031-2046 | |
| 8 | Chip Bishop | 3.089 | 2015-2030 | |
| 9 | Holden Rosen Grupp | 3.166 | 2030-2042 | |
| 10 | Sexto Rodríguez | 3.167 | 2015-2025 | |
| 11 | Alexis Zambaco | 3.218 | 2028-2040 | |
| 11 | Jeff Territt | 3.218 | 2020-2035 | |
| 13 | George Frazier | 3.226 | 2017-2037 | |
| 14 | Ron Manning | 3.262 | 2029-2043 | |
| 15 | Greg White | 3.406 | 2015-2028 | |
| 16 | Alfonso Zapata | 3.410 | 2022-2033 | |
| 17 | Lou Meadows | 3.429 | 2016-2029 | |
| 18 | John Brown | 3.543 | 2017-2031 | |
| 19 | Cris Herrera | 3.559 | 2024-2034 | |
| 20 | Will Hunting | 3.576 | 2030-2044 | |
| 21 | Myles Wilkerson | 3.620 | 2026-2033 | |
| 22 | Quintiliano Seixal | 3.633 | 2025-2036 | |
| 23 | Shawn Williams | 3.644 | 2030-2040 | |
| 24 | José Alaniz | 3.645 | 2016-2030 | |
| 25 | Roderick Rhodes | 3.652 | 2015-2030 | |
| 26 | Jon Briddon | 3.712 | 2022-2032 | |
| 27 | Rod Watts# | 3.713 | 2037-2046 | |
| 28 | Edison Larson | 3.714 | 2020-2039 | |
| 29 | Mal Houser | 3.716 | 2029-2038 | |
| 30 | Nolan Howard | 3.732 | 2034-2045 | |
| 31 | Woody Carlson | 3.780 | 2020-2033 | |
| 32 | Art Adams | 3.782 | 2021-2030 | |
| 33 | Hermenegildo Beliago | 3.787 | 2027-2044 | |
| 34 | Jared Cox | 3.803 | 2016-2022 | |
| 35 | William MacKnight | 3.806 | 2022-2028 | |
| 35 | Paul Lowery | 3.806 | 2015-2020 | |
| 37 | Adrián Fierro | 3.851 | 2020-2034 | |
| 38 | Hong-bin Hua# | 3.852 | 2040-2046 | |
| 39 | Luis Díaz# | 3.890 | 2033-2046 | |
| 40 | Zalontae Hillary | 3.895 | 2031-2038 | |
| 40 | Panda Montana | 3.895 | 2029-2041 | |
| 42 | Matt Harris | 3.917 | 2020-2031 | |
| 43 | Armando Romano | 3.928 | 2033-2038 | |
| 44 | Roman Phansalker# | 3.934 | 2038-2046 | |
| 45 | Ryan Peterson | 3.954 | 2026-2036 | |
| 46 | Neil Franson | 3.986 | 2030-2042 | |
| 47 | Marvin Martin | 4.060 | 2025-2041 | |
| 48 | Benny York | 4.071 | 2015-2029 | |
| 49 | Ernesto López | 4.080 | 2036-2045 | |
| 50 | Robbie Betchley | 4.087 | 2030-2040 | |
| 51 | Javier Desdin | 4.090 | 2026-2043 | |
| 52 | Rusty Swanson | 4.095 | 2026-2035 | |
| 52 | Leroy Moody | 4.095 | 2025-2032 | |
| 54 | Alfonso Miranda | 4.118 | 2022-2031 | |
| 55 | Shunen Takahashi | 4.124 | 2023-2035 | |
| 56 | Collin Hill | 4.139 | 2020-2028 | |
| 57 | Lance Barber# | 4.144 | 2040-2046 | |
| 58 | Mark Collingwood | 4.147 | 2031-2041 | |
| 59 | António Castillo | 4.207 | 2027-2038 | |
| 60 | Domingo Ramírez | 4.219 | 2023-2040 | |
| 61 | Juan Montoya | 4.225 | 2025-2036 | |
| 62 | Gerald Orlebar# | 4.247 | 2035-2046 | |
| 63 | Melvin Haney | 4.258 | 2023-2030 | |
| 64 | Kenshin Koike | 4.278 | 2018-2032 | |
| 65 | Esteban Rodríguez# | 4.294 | 2035-2044 | |
| 66 | Jordan Calhoun# | 4.301 | 2037-2046 | |
| 67 | Elroy Thompkins | 4.357 | 2028-2043 | |
| 68 | Masahiro Sakei | 4.387 | 2035-2041 | |
| 69 | Yusuke Chikafuji | 4.436 | 2024-2032 | |
| 70 | Pete Rhue | 4.461 | 2032-2040 | |
| 71 | Christian Patrick | 4.467 | 2019-2028 | |
| 72 | Román Mejía# | 4.489 | 2034-2046 | |
| 73 | Alain Arnaud | 4.498 | 2036-2043 | |
| 74 | José Ruíz | 4.580 | 2035-2040 | |
| 75 | Gunner Hardy | 4.634 | 2016-2028 | |
| 76 | Manny Castro | 4.662 | 2030-2037 | |
| 77 | Harry Stuterberg# | 4.670 | 2034-2046 | |
| 78 | David Collingwood | 4.706 | 2018-2031 | |
| 79 | Bob Compton | 4.888 | 2015-2023 | |
| 80 | Merlin Bassett | 4.897 | 2029-2038 | |
| 81 | Doug Green | 4.949 | 2022-2032 |
