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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | César Rosado | 1.81 | 2021-2023 | |
| 2 | Jesús Garces# | 2.31 | 2026-2028 | |
| 3 | Alejandro García# | 2.34 | 2026-2030 | |
| 4 | Stanley Eldrige# | 2.43 | 2025-2027 | |
| 5 | Héctor Aguilar# | 2.54 | 2026-2028 | |
| 6 | Pat Thompson | 2.65 | 2020-2022 | |
| 7 | Nicolas Roche# | 2.70 | 2027-2030 | |
| 8 | Reynaldo Sánchez# | 2.94 | 2020-2023 | |
| 9 | Phil Hanson | 2.96 | 2020-2023 | |
| 10 | Lincoln Spooner# | 3.01 | 2026-2028 | |
| 11 | Octávio Ríos# | 3.24 | 2020-2022 | |
| 12 | Edmund Blackadder# | 3.27 | 2026-2030 | |
| 13 | Gabriel Herrera# | 3.36 | 2022-2025 | |
| 13 | Barry Mullen# | 3.36 | 2028-2030 | |
| 15 | Will Hoffman# | 3.37 | 2026-2028 | |
| 16 | Bernardino Neagle | 3.48 | 2020-2023 | |
| 17 | Garrett Schaper# | 3.64 | 2025-2030 | |
| 18 | Rhys Maskell# | 3.92 | 2031-2032 | |
| 19 | Enea Dini | 4.07 | 2020-2024 | |
| 20 | Curt Walker# | 4.28 | 2021-2023 |
