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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Tomiji Saikawa | 1.19 | 2023-2028 | |
| 2 | Xavier Padilla# | 1.27 | 2025-2031 | |
| 3 | Miguel Mora | 1.28 | 2015-2020 | |
| 3 | Zane Reed | 1.28 | 2017-2028 | |
| 5 | Miguel González | 1.33 | 2015-2018 | |
| 6 | Javier Penela | 1.36 | 2015-2020 | |
| 6 | Fernando Reyna | 1.36 | 2015-2027 | |
| 8 | José Santiago# | 1.37 | 2028-2032 | |
| 9 | Ipe Talboom | 1.40 | 2024-2028 | |
| 10 | Raúl Pérez | 1.46 | 2015-2028 | |
| 10 | Il-gyung Kim | 1.46 | 2017-2026 | |
| 12 | Romano Martínez# | 1.47 | 2024-2029 | |
| 13 | Juan Núñez | 1.65 | 2015-2018 |
