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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Xavier Padilla | 3.32 | 2025-2031 | |
| 2 | Ricardo Fraga# | 3.36 | 2030-2037 | |
| 3 | Rafael González | 3.42 | 2033-2039 | |
| 4 | Fernando Reyna | 3.54 | 2015-2027 | |
| 5 | Joaquín Pérez# | 3.55 | 2033-2037 | |
| 6 | Miguel Mora | 3.80 | 2015-2020 | |
| 7 | José Santiago | 3.92 | 2028-2032 | |
| 8 | Raúl Pérez | 3.98 | 2015-2028 | |
| 9 | Il-gyung Kim | 4.19 | 2017-2026 | |
| 10 | Romano Martínez | 4.74 | 2024-2029 |
