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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Drew Cullen | 3.52 | 2027-2035 | |
| 2 | Mario Ruíz | 3.58 | 2023-2031 | |
| 3 | Roy Alsobrook# | 3.70 | 2028-2038 | |
| 4 | Victor Brey | 3.81 | 2021-2028 | |
| 5 | Gary Barber | 4.15 | 2021-2033 | |
| 6 | Chae-seong Kim | 4.16 | 2023-2033 | |
| 7 | Claudio Díaz | 4.27 | 2022-2031 | |
| 8 | Luis Hernández | 4.37 | 2030-2037 | |
| 9 | Wop Baars# | 4.41 | 2032-2041 | |
| 10 | Matt Davenport | 4.62 | 2029-2037 | |
| 11 | Jorge Cedeño | 4.64 | 2033-2037 | |
| 12 | José Salinas | 4.73 | 2017-2027 | |
| 13 | King Fletcher | 4.91 | 2023-2030 | |
| 14 | Willie Cameron | 5.35 | 2016-2031 | |
| 15 | Reynaldo Sánchez | 5.78 | 2024-2032 | |
| 16 | Earl Brown | 6.00 | 2023-2031 | |
| 17 | Marcos Mesa | 6.01 | 2023-2030 |
