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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Brock Dykxhoorn | 0.67 | 2020 | |
| 2 | Cody Reed | 0.84 | 2016 | |
| 3 | Diomenges Almengo# | 1.00 | 2018 | |
| 4 | Shane Dawson | 1.02 | 2018 | |
| 5 | Niall Windeler# | 1.13 | 2021 | |
| 6 | Carlos G. Hernandez | 1.26 | 2020 | |
| 7 | Reid Morgan# | 1.38 | 2020 | |
| 8 | Lucas Giolito# | 1.40 | 2014 | |
| 9 | Adrian Houser# | 1.69 | 2014 | |
| 9 | Chih-Wei Hu | 1.69 | 2014 | |
| 11 | Lucas Giolito# | 2.03 | 2013 |
