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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Ben Crabb# | 0.68 | 2026-2032 | |
| 2 | Don Wheeler# | 0.83 | 2029-2032 | |
| 3 | Matsuyo Koda# | 0.97 | 2026-2029 | |
| 4 | Willi Kehr# | 1.04 | 2026-2028 | |
| 5 | Jake Robinson | 1.05 | 2017-2024 | |
| 6 | Robert Osborne | 1.13 | 2014-2020 | |
| 7 | Felipe Arreola# | 1.26 | 2027-2028 | |
| 8 | Benny Hartley# | 1.28 | 2022-2022 | |
| 9 | Juan Martínez# | 1.30 | 2028-2029 | |
| 10 | George Clay | 1.31 | 2013-2020 | |
| 11 | Jeff Stephens# | 1.37 | 2028-2032 | |
| 12 | Ánibal Altichioro# | 1.40 | 2024-2028 | |
| 13 | Luis Olvera | 1.46 | 2018-2020 |
