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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Atasuke Inoue# | 0.74 | 2025-2028 | |
| 2 | Román Morales# | 0.82 | 2037-2040 | |
| 3 | Taizo Otsuka# | 0.83 | 2036-2039 | |
| 3 | Armando Batista# | 0.83 | 2025-2028 | |
| 5 | Adrie Revet# | 0.84 | 2036-2039 | |
| 6 | José Ortíz# | 0.85 | 2025-2028 | |
| 7 | Brett Purkis# | 0.89 | 2033-2037 | |
| 8 | Dylan Mcintosh | 0.93 | 2021-2025 | |
| 9 | Luis López# | 0.96 | 2026-2029 | |
| 10 | Josh Cheney# | 0.99 | 2024-2027 | |
| 11 | Harris MacLay# | 1.00 | 2033-2037 | |
| 12 | Ryosei Kichida# | 1.02 | 2032-2036 | |
| 13 | Ramón Carlos# | 1.03 | 2033-2036 | |
| 13 | Cheong-u So# | 1.03 | 2034-2037 | |
| 13 | Raúl Martínez# | 1.03 | 2033-2037 | |
| 16 | Masahiro Maruyama# | 1.04 | 2033-2036 | |
| 17 | Ju-wei Zong# | 1.05 | 2021-2024 | |
| 18 | Ryuzaburo Yamaguchi# | 1.08 | 2036-2039 | |
| 18 | Teo Beerens# | 1.08 | 2032-2036 | |
| 20 | Ricardo Colón# | 1.11 | 2033-2037 | |
| 20 | Morgan Kingston# | 1.11 | 2033-2037 | |
| 22 | Kenshin Iijima# | 1.19 | 2033-2037 | |
| 23 | Raúl Morales# | 1.21 | 2033-2037 | |
| 24 | Ieyoshi Kiyomizu# | 1.23 | 2033-2037 | |
| 25 | Timothy Fewings# | 1.28 | 2032-2036 | |
| 25 | Ikemoto Kodo# | 1.28 | 2033-2037 |
