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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Jay Nunn | 0.890 | 2023-2026 | |
| 2 | Kyu-cheol Na | 0.956 | 2022-2028 | |
| 3 | Jorge López# | 1.154 | 2036-2039 | |
| 4 | Jorge Gómez | 1.246 | 2028-2030 | |
| 5 | Tetsuzan Hashimoto# | 1.324 | 2036-2039 | |
| 6 | Fernando García | 1.421 | 2029-2030 | |
| 7 | Kyoichi Gato | 1.528 | 2021-2022 | |
| 8 | Pat Barr# | 1.653 | 2040-2041 | |
| 9 | Juan Canó | 1.835 | 2019-2021 | |
| 10 | Francisco Santana# | 2.150 | 2035-2037 | |
| 11 | Hidekazu Suzuki# | 2.400 | 2038-2040 | |
| 12 | Dani Montés# | 2.585 | 2026-2027 | |
| 13 | Mito Okuda | 2.829 | 2027-2030 | |
| 14 | Toshimichi Ohayashi# | 2.872 | 2039-2040 | |
| 15 | Dylan Stinson# | 3.160 | 2030-2031 | |
| 16 | Félix Crisanto# | 3.762 | 2037-2038 | |
| 17 | Damien Neighbour# | 3.886 | 2029-2031 | |
| 18 | Huo-tu Guo# | 4.812 | 2034-2036 |
