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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | John Bunch# | 1.20 | 2054-2058 | |
| 2 | Pedro Rodríguez | 1.30 | 2042-2048 | |
| 3 | Louis McDowell | 1.38 | 2015-2030 | |
| 4 | Manuel Medranda | 1.39 | 2034-2039 | |
| 5 | Júlio Vázquez | 1.45 | 2027-2032 | |
| 6 | Woo-suk Cho | 1.48 | 2026-2032 | |
| 6 | Felipe Hernández | 1.48 | 2047-2053 | |
| 8 | David Davis | 1.55 | 2019-2030 | |
| 9 | Mike Barrett | 1.59 | 2022-2027 |
