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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Héctor Aguilar | 1.05 | 2026-2028 | |
| 2 | Reynaldo Sánchez | 1.14 | 2020-2023 | |
| 3 | Pat Thompson | 1.17 | 2020-2022 | |
| 4 | Júlio Díaz# | 1.20 | 2032-2034 | |
| 4 | Nicolas Roche# | 1.20 | 2027-2030 | |
| 6 | Octávio Ríos# | 1.21 | 2020-2022 | |
| 7 | Lincoln Spooner# | 1.24 | 2026-2028 | |
| 7 | Will Hoffman# | 1.24 | 2026-2028 | |
| 9 | Bailey Achurch# | 1.28 | 2031-2035 | |
| 10 | Edmund Blackadder# | 1.31 | 2026-2030 | |
| 11 | Yoshihide Hirata# | 1.33 | 2030-2034 | |
| 12 | Enea Dini | 1.45 | 2020-2024 |
