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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Hidemichi Kikuchi | 3.99 | 2017-2022 | |
| 2 | Sancho Ortega | 4.11 | 2021-2028 | |
| 3 | Gregg Emerson | 4.30 | 2024-2031 | |
| 4 | David Bryan | 4.32 | 2012-2025 | |
| 5 | Máximo Cucalón | 4.37 | 2016-2025 | |
| 6 | Si-dao Chen# | 4.43 | 2024-2031 | |
| 6 | Iván Rea | 4.43 | 2021-2028 | |
| 8 | Kang-il Hyong# | 4.49 | 2028-2033 | |
| 9 | Dick Wassenaer | 4.51 | 2020-2028 | |
| 10 | Shoichi Ikeda# | 4.53 | 2026-2033 | |
| 10 | Andrew St. John | 4.53 | 2015-2019 | |
| 12 | Sergio Ortíz | 4.64 | 2014-2020 | |
| 13 | Noritoshi Hayashi# | 4.65 | 2024-2031 | |
| 14 | Adam Lewis# | 4.74 | 2025-2032 | |
| 15 | Kaong Foong# | 4.82 | 2026-2033 | |
| 16 | Júlio Herrera# | 4.83 | 2021-2033 | |
| 17 | Héctor Navarro# | 5.27 | 2024-2033 | |
| 18 | Daisuke Nakanishi | 5.29 | 2017-2026 | |
| 18 | Román Cruz | 5.29 | 2018-2025 | |
| 20 | Bob Hill | 5.51 | 2020-2028 | |
| 21 | Lourenço Russa# | 5.90 | 2027-2033 | |
| 22 | Mario Robles# | 6.42 | 2025-2032 |
