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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Teddy Barnes | 1.18 | 2049-2052 | |
| 2 | Joaquín Pérez | 1.23 | 2033-2037 | |
| 3 | Ricardo Fraga | 1.26 | 2030-2037 | |
| 4 | Rafael González | 1.27 | 2033-2039 | |
| 4 | Xavier Padilla | 1.27 | 2025-2031 | |
| 6 | Miguel Mora | 1.28 | 2015-2020 | |
| 7 | Fernando Reyna | 1.36 | 2015-2027 | |
| 8 | Gerard Fyson | 1.37 | 2040-2045 | |
| 8 | José Santiago | 1.37 | 2028-2032 | |
| 10 | Mark Brunswick | 1.43 | 2042-2048 | |
| 11 | Raúl Pérez | 1.46 | 2015-2028 | |
| 11 | Il-gyung Kim | 1.46 | 2017-2026 | |
| 13 | Romano Martínez | 1.47 | 2024-2029 |
