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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Francisco Encarnación# | 2.932 | 2051-2057 | |
| 2 | Xavier Padilla | 3.316 | 2025-2031 | |
| 3 | Ricardo Fraga | 3.359 | 2030-2037 | |
| 4 | Teddy Barnes | 3.368 | 2049-2052 | |
| 5 | Rafael González | 3.425 | 2033-2039 | |
| 6 | Fernando Reyna | 3.545 | 2015-2027 | |
| 7 | Joaquín Pérez | 3.553 | 2033-2037 | |
| 8 | Miguel Mora | 3.802 | 2015-2020 | |
| 9 | José Santiago | 3.917 | 2028-2032 | |
| 10 | Raúl Pérez | 3.983 | 2015-2028 | |
| 11 | Il-gyung Kim | 4.189 | 2017-2026 | |
| 12 | Gerard Fyson | 4.543 | 2040-2045 | |
| 13 | Romano Martínez | 4.737 | 2024-2029 | |
| 14 | Mark Brunswick | 4.754 | 2042-2048 |
