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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 | Douglas Pantall# | 4.32 | 2028-2034 | |
| 4 | David Bryan | 4.32 | 2012-2025 | |
| 6 | Máximo Cucalón | 4.37 | 2016-2025 | |
| 7 | Si-dao Chen | 4.43 | 2024-2031 | |
| 7 | Iván Rea | 4.43 | 2021-2028 | |
| 9 | Kang-il Hyong# | 4.49 | 2028-2033 | |
| 10 | Dick Wassenaer | 4.51 | 2020-2028 | |
| 11 | Andrew St. John | 4.53 | 2015-2019 | |
| 12 | Sergio Ortíz | 4.64 | 2014-2020 | |
| 13 | Noritoshi Hayashi# | 4.65 | 2024-2031 | |
| 14 | Shoichi Ikeda# | 4.68 | 2026-2034 | |
| 15 | Adam Lewis# | 4.74 | 2025-2032 | |
| 16 | Júlio Herrera | 4.83 | 2021-2033 | |
| 17 | Kaong Foong# | 4.84 | 2026-2034 | |
| 18 | Miguel Hinojosa# | 5.00 | 2026-2034 | |
| 19 | Héctor Navarro# | 5.24 | 2024-2034 | |
| 20 | Daisuke Nakanishi | 5.29 | 2017-2026 | |
| 20 | Román Cruz | 5.29 | 2018-2025 | |
| 22 | Bob Hill | 5.51 | 2020-2028 | |
| 23 | Lourenço Russa# | 5.71 | 2027-2034 | |
| 24 | Mario Robles | 6.42 | 2025-2032 |
