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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Abel Gibson | 0.88 | 2028-2035 | |
| 2 | Harold Aspell | 0.94 | 2025-2027 | |
| 3 | Juan Acevedo | 0.97 | 2020-2026 | |
| 4 | Félix Hernández | 1.07 | 2027-2028 | |
| 5 | José Guerra | 1.10 | 2022-2025 | |
| 6 | Jorge Cintrón | 1.11 | 2026-2027 | |
| 7 | Jimmy Greenwood | 1.13 | 2026-2045 | |
| 8 | José Pezina | 1.22 | 2022-2029 | |
| 9 | Javier Velázquez | 1.23 | 2025-2031 | |
| 10 | José López | 1.24 | 2036-2046 | |
| 11 | Natsuo Kono# | 1.27 | 2053-2057 | |
| 11 | Dan O'Manning | 1.27 | 2027-2036 | |
| 13 | José Rosas | 1.30 | 2027-2031 | |
| 13 | Jesús Pacheco | 1.30 | 2023-2027 | |
| 15 | Juan Rodríguez | 1.31 | 2024-2034 | |
| 15 | Hani Goddard# | 1.31 | 2044-2054 | |
| 17 | Curtis Barnes | 1.34 | 2027-2031 | |
| 18 | José Gallegos | 1.38 | 2023-2027 | |
| 19 | Brent Strom# | 1.42 | 2050-2056 | |
| 20 | Ramiro Medina | 1.47 | 2050-2054 | |
| 20 | John Campbell Jr. | 1.47 | 2028-2036 | |
| 22 | José Castillo | 1.66 | 2021-2034 | |
| 23 | Salvador Gonzáles | 1.71 | 2027-2035 |
