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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Robert Cook | 1.144 | 2021-2036 | |
| 2 | Alex Nambo | 1.205 | 2033-2043 | |
| 3 | Manuel Sánchez | 2.030 | 2024-2035 | |
| 4 | James Crowe | 2.374 | 2032-2043 | |
| 5 | Devon Miller# | 2.480 | 2047-2054 | |
| 6 | Ramón Gómez | 2.516 | 2027-2039 | |
| 7 | Joe Ward | 2.786 | 2013-2022 | |
| 8 | Ricky Juarez | 3.057 | 2038-2043 | |
| 9 | Wayne Penfield | 3.079 | 2020-2029 | |
| 10 | Adharma Sughavanam | 3.273 | 2024-2035 | |
| 11 | John Stroud | 3.375 | 2021-2030 | |
| 12 | Joey Cabler | 3.682 | 2043-2050 | |
| 13 | Willi Kehr | 3.695 | 2030-2035 | |
| 14 | Paul Durden | 3.734 | 2012-2017 | |
| 15 | Lester Bisdu | 3.894 | 2030-2042 | |
| 16 | Kagehisa Saikawa | 4.050 | 2022-2035 | |
| 16 | Vincent Vickers | 4.050 | 2025-2038 | |
| 18 | Carlos Ramirez | 4.205 | 2042-2047 | |
| 19 | Rick Childress | 4.255 | 2026-2034 | |
| 20 | Emilio Peres | 4.263 | 2038-2044 | |
| 21 | Joel Hyle# | 4.336 | 2052-2057 | |
| 22 | Khalil Haywood# | 4.339 | 2053-2057 | |
| 23 | Yeong-suk Kim | 4.460 | 2021-2034 | |
| 24 | Juan Martínez | 4.468 | 2030-2043 | |
| 25 | Carlos León | 4.500 | 2022-2033 | |
| 26 | Ken Stein | 4.655 | 2034-2045 | |
| 27 | Torikatzu Nishiyama | 4.750 | 2038-2043 | |
| 28 | Luis Padro# | 4.869 | 2053-2057 | |
| 29 | Kichibei Ozawa | 4.981 | 2026-2030 | |
| 30 | Yoshiaga Rin | 5.037 | 2024-2032 | |
| 31 | Alex Munoz | 5.108 | 2034-2044 | |
| 32 | Jorge Olivo | 5.116 | 2032-2038 | |
| 33 | Alain Picard | 5.207 | 2030-2042 | |
| 34 | Mike Sprake | 5.625 | 2020-2027 | |
| 35 | Eddie Beltran | 5.786 | 2042-2054 | |
| 36 | Marcus Seraphin# | 6.210 | 2048-2056 | |
| 37 | Alberto Ramírez | 7.389 | 2018-2026 | |
| 38 | Lloyd Huggins | 7.714 | 2032-2041 | |
| 39 | Dennis Montgomery | 7.750 | 2030-2042 | |
| 40 | Joe Hurst | 9.257 | 2025-2033 |
