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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Manuel García | 0.60 | 2020 | |
| 2 | Bob Moore | 1.00 | 2014 | |
| 3 | Richard Lawson | 1.30 | 2023 | |
| 4 | Rubén Cabrera | 1.33 | 2023 |
