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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 | Zane Reed | 3.51 | 2017-2028 | |
| 3 | Fernando Reyna | 3.54 | 2015-2027 | |
| 4 | Tomiji Saikawa | 3.55 | 2023-2028 | |
| 5 | Luis Castrejón# | 3.59 | 2019-2031 | |
| 6 | Miguel Mora | 3.80 | 2015-2020 | |
| 7 | José Santiago# | 3.92 | 2028-2032 | |
| 8 | Bob Payne# | 3.95 | 2025-2027 | |
| 9 | Miguel González | 3.96 | 2015-2018 | |
| 10 | Raúl Pérez | 3.98 | 2015-2028 | |
| 11 | Alberto Solís# | 4.05 | 2029-2032 | |
| 12 | Currito Melena# | 4.06 | 2025-2030 | |
| 13 | Il-gyung Kim | 4.19 | 2017-2026 | |
| 14 | Javier Penela | 4.24 | 2015-2020 | |
| 15 | Ipe Talboom | 4.45 | 2024-2028 | |
| 16 | Romano Martínez# | 4.74 | 2024-2029 | |
| 17 | Juan Núñez | 5.15 | 2015-2018 |
