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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Luis Leyva | 0.93 | 2013-2019 | |
| 2 | Michael Calhoun | 1.06 | 2044-2049 | |
| 3 | Toby Adams | 1.10 | 2034-2047 | |
| 4 | Júlio Caraballo | 1.11 | 2030-2034 | |
| 5 | Takeichi Koike | 1.16 | 2017-2020 | |
| 6 | Bubba McCall# | 1.23 | 2046-2051 | |
| 7 | Dave Boyer# | 1.28 | 2043-2051 | |
| 8 | Rory Taverner | 1.31 | 2023-2025 | |
| 9 | Jarred Benson | 1.38 | 2038-2043 | |
| 10 | Will Lester | 1.41 | 2021-2023 | |
| 11 | Bill Davis | 1.42 | 2030-2037 |
