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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Jorge Gómez | 0.51 | 2028-2030 | |
| 2 | Jorge López# | 0.64 | 2036-2039 | |
| 3 | Tetsuzan Hashimoto# | 0.88 | 2036-2039 | |
| 4 | Jay Nunn | 0.89 | 2023-2026 | |
| 5 | Toshimichi Ohayashi# | 0.93 | 2039-2040 | |
| 5 | Félix Crisanto# | 0.93 | 2037-2038 | |
| 7 | Fernando García | 0.95 | 2029-2030 | |
| 7 | Pat Barr# | 0.95 | 2040-2041 | |
| 9 | Kyoichi Gato | 1.05 | 2021-2022 | |
| 10 | Kyu-cheol Na | 1.12 | 2022-2028 | |
| 11 | Juan Canó | 1.14 | 2019-2021 | |
| 11 | Francisco Santana# | 1.14 | 2035-2037 | |
| 13 | Hidekazu Suzuki# | 1.17 | 2038-2040 | |
| 14 | Damien Neighbour# | 1.20 | 2029-2031 | |
| 15 | Dani Montés# | 1.24 | 2026-2027 | |
| 16 | Mito Okuda | 1.26 | 2027-2030 | |
| 17 | Dylan Stinson# | 1.47 | 2030-2031 | |
| 18 | Huo-tu Guo# | 1.63 | 2034-2036 |
