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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Kululu Olujimi# | 1.102 | 2149 | |
| 2 | Ki-heon Myong# | 1.731 | 2149 | |
| 3 | Naomi Matsunaga# | 2.314 | 2149 | |
| 4 | Alexander Børresen# | 3.767 | 2149 | |
| 5 | Almas bin Abbud# | 4.154 | 2149 | |
| 6 | Mudasser Mughal# | 4.190 | 2149 | |
| 7 | Xin-fang Zeng# | 5.162 | 2149 | |
| 8 | Jong-kook Pak# | 5.400 | 2149 | |
| 9 | José Vélez# | 6.750 | 2149 |
