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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Ewan Moore# | 1.00 | 1952 | |
| 2 | Mounir Soulier# | 1.06 | 1953 | |
| 3 | Mounir Soulier# | 1.14 | 1952 | |
| 4 | Danny Arellano# | 1.23 | 1953 | |
| 5 | Omar Cespedes# | 1.32 | 1953 | |
| 6 | Aaron Maier# | 1.47 | 1952 | |
| 7 | Aaron Maier# | 1.48 | 1953 |
