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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Rodger Kraamer# | 0.509 | 2031 | |
| 2 | Pete Cote# | 0.574 | 2031 | |
| 3 | Connor West# | 1.403 | 2031 | |
| 4 | Ethan Grimwade# | 2.400 | 2031 | |
| 5 | Shunji Miyamoto# | 3.086 | 2031 | |
| 6 | Kazuyuki Asai# | 3.306 | 2031 | |
| 7 | Anthony Qualtrough# | 3.375 | 2031 | |
| 8 | Kiyonobu Iijima# | 3.780 | 2031 | |
| 9 | Cristián Mata# | 3.857 | 2031 | |
| 10 | José Flores# | 4.021 | 2031 | |
| 11 | Eduardo Delgado# | 4.050 | 2031 | |
| 12 | Richard West# | 4.101 | 2031 | |
| 13 | José García# | 4.585 | 2031 | |
| 14 | Pedro López# | 5.625 | 2031 | |
| 15 | Rubén Fuentes# | 6.000 | 2031 | |
| 16 | José Gálvez# | 6.288 | 2031 | |
| 17 | Raúl Madrigal# | 6.932 | 2031 | |
| 18 | Kunihiko Nakano# | 7.714 | 2031 | |
| 19 | Nae-wi Min# | 7.941 | 2031 |
