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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Kululu Olujimi# | 0.86 | 2149 | |
| 2 | Ki-heon Myong# | 0.96 | 2149 | |
| 3 | Jong-kook Pak# | 1.16 | 2149 | |
| 4 | Naomi Matsunaga# | 1.29 | 2149 | |
| 4 | Mudasser Mughal# | 1.29 | 2149 | |
| 6 | Alexander Børresen# | 1.36 | 2149 | |
| 7 | José Vélez# | 1.40 | 2149 | |
| 8 | Almas bin Abbud# | 1.46 | 2149 | |
| 9 | Xin-fang Zeng# | 1.76 | 2149 |
