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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Santiago Rivera# | 1.21 | 2025 | |
| 2 | Emmett Rogers# | 1.29 | 2025 | |
| 3 | John Gillies# | 1.47 | 2025 | |
| 4 | Hector Mendoza# | 1.62 | 2025 | |
| 5 | Scott Lewandowski# | 1.64 | 2025 |
