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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | António López# | 1.26 | 2041-2048 | |
| 1 | Roy Alsobrook | 1.26 | 2028-2038 | |
| 3 | Patrick Ibáñez | 1.35 | 2035-2046 | |
| 3 | Drew Cullen | 1.35 | 2027-2035 | |
| 5 | Mario Ruíz | 1.40 | 2023-2031 | |
| 6 | Victor Brey | 1.41 | 2021-2028 | |
| 6 | Jorge Cedeño | 1.41 | 2033-2037 | |
| 8 | Matt Davenport | 1.42 | 2029-2037 | |
| 9 | Gary Barber | 1.43 | 2021-2033 | |
| 9 | Luis Hernández | 1.43 | 2030-2037 | |
| 11 | José Salinas | 1.45 | 2017-2027 | |
| 11 | Wop Baars | 1.45 | 2032-2041 | |
| 13 | Claudio Díaz | 1.49 | 2022-2031 | |
| 14 | King Fletcher | 1.55 | 2023-2030 | |
| 15 | Chae-seong Kim | 1.56 | 2023-2033 | |
| 16 | Willie Cameron | 1.60 | 2016-2031 | |
| 17 | Earl Brown | 1.75 | 2023-2031 | |
| 18 | Reynaldo Sánchez | 1.77 | 2024-2032 | |
| 19 | Marcos Mesa | 1.82 | 2023-2030 |
