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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Kiyonobu Iijima# | 0.96 | 2031 | |
| 2 | Connor West# | 0.97 | 2031 | |
| 3 | Kazuyuki Asai# | 0.98 | 2031 | |
| 4 | Ethan Grimwade# | 1.00 | 2031 | |
| 5 | Rodger Kraamer# | 1.02 | 2031 | |
| 6 | Anthony Qualtrough# | 1.06 | 2031 | |
| 7 | Richard West# | 1.10 | 2031 | |
| 8 | Shunji Miyamoto# | 1.11 | 2031 | |
| 9 | Eduardo Delgado# | 1.20 | 2031 | |
| 10 | Pete Cote# | 1.34 | 2031 | |
| 11 | José Gálvez# | 1.56 | 2031 | |
| 12 | José García# | 1.64 | 2031 | |
| 13 | Nae-wi Min# | 1.65 | 2031 | |
| 14 | Raúl Madrigal# | 1.66 | 2031 | |
| 15 | Cristián Mata# | 1.68 | 2031 | |
| 16 | José Flores# | 1.72 | 2031 | |
| 17 | Pedro López# | 1.75 | 2031 | |
| 18 | Rubén Fuentes# | 1.96 | 2031 | |
| 19 | Kunihiko Nakano# | 2.27 | 2031 |
