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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Pedro Santiago | 1.07 | 2024-2027 | |
| 2 | Ryosei Takeda | 1.12 | 2014-2018 | |
| 3 | Won-min Im | 1.28 | 2013-2017 | |
| 4 | Pedro Valdés | 1.41 | 2015-2021 | |
| 5 | John Belcher | 1.45 | 2031-2036 | |
| 6 | Scot MacIntosh | 1.46 | 2018-2023 |
