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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Atasuke Inoue# | 1.391 | 2025-2028 | |
| 2 | Román Morales# | 1.664 | 2037-2040 | |
| 3 | Taizo Otsuka# | 1.715 | 2036-2039 | |
| 4 | Brett Purkis# | 1.741 | 2033-2037 | |
| 5 | Adrie Revet# | 1.883 | 2036-2039 | |
| 6 | Luis López# | 1.957 | 2026-2029 | |
| 7 | José Ortíz# | 1.983 | 2025-2028 | |
| 8 | Josh Cheney# | 2.197 | 2024-2027 | |
| 9 | Harris MacLay# | 2.257 | 2033-2037 | |
| 10 | Ramón Carlos# | 2.280 | 2033-2036 | |
| 11 | Armando Batista# | 2.355 | 2025-2028 | |
| 12 | Cheong-u So# | 2.458 | 2034-2037 | |
| 13 | Masahiro Maruyama# | 2.493 | 2033-2036 | |
| 14 | Ryuzaburo Yamaguchi# | 2.524 | 2036-2039 | |
| 15 | Ricardo Colón# | 2.689 | 2033-2037 | |
| 16 | Raúl Martínez# | 2.697 | 2033-2037 | |
| 17 | Ryosei Kichida# | 2.761 | 2032-2036 | |
| 18 | Dylan Mcintosh | 2.829 | 2021-2025 | |
| 19 | Ju-wei Zong# | 2.893 | 2021-2024 | |
| 20 | Morgan Kingston# | 2.962 | 2033-2037 | |
| 21 | Teo Beerens# | 3.206 | 2032-2036 | |
| 22 | Ieyoshi Kiyomizu# | 3.296 | 2033-2037 | |
| 23 | Kenshin Iijima# | 3.522 | 2033-2037 | |
| 24 | Raúl Morales# | 4.178 | 2033-2037 | |
| 25 | Timothy Fewings# | 4.426 | 2032-2036 | |
| 26 | Ikemoto Kodo# | 4.731 | 2033-2037 |
