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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | James Henderson# | 0.67 | 2031 | |
| 2 | Fernando Cardehas# | 0.83 | 2031 | |
| 3 | Raúl Zamora# | 0.90 | 2031 | |
| 4 | Júlio Rentería# | 0.98 | 2031 | |
| 5 | Leone Carnini# | 1.00 | 2031 | |
| 6 | Ronald Holland# | 1.10 | 2031 | |
| 7 | Júlio Ramírez# | 1.13 | 2031 | |
| 8 | Jerry Smith# | 1.14 | 2031 | |
| 9 | Sergio Guerrero# | 1.32 | 2031 | |
| 10 | Luuk Trierum# | 1.47 | 2031 | |
| 11 | George Burke# | 1.52 | 2031 | |
| 12 | Manuel Martínez# | 1.55 | 2031 |
