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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Ángel Chavez | 1.20 | 1978-1980 | |
| 2 | Koert Goderie | 1.24 | 1983-1989 | |
| 3 | Leo Fernandez | 1.26 | 1995-2000 | |
| 4 | Tom Hicks | 1.43 | 2025-2030 | |
| 5 | Tom Ryan | 1.51 | 2028-2035 |
