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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Duane Deal# | 0.667 | 2030 | |
| 2 | Matt Hoffman | 0.688 | 2028 | |
| 3 | Danny Clayton# | 0.812 | 2030 | |
| 4 | Jim Snyder# | 0.900 | 2033 | |
| 5 | Ángel Rodríguez | 0.911 | 2031 | |
| 6 | Henry Owens# | 1.109 | 2033 | |
| 6 | Dave Wheeler# | 1.109 | 2038 | |
| 8 | Lou Ferrell# | 1.145 | 2036 | |
| 9 | Mike Marks | 1.269 | 2032 | |
| 10 | Jesús Rivera# | 1.333 | 2035 |
