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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 | 0.600 | 2020 | |
| 2 | Roger Stewart# | 0.611 | 2029 | |
| 3 | Bob Moore | 1.000 | 2014 | |
| 4 | Richard Lawson# | 1.302 | 2023 | |
| 5 | Rubén Cabrera# | 1.333 | 2023 |
