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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 | Brian Fixel# | 2.33 | 2023-2025 | |
| 4 | Alejandro García# | 2.34 | 2026-2030 | |
| 5 | Stanley Eldrige# | 2.43 | 2025-2027 | |
| 6 | Jesús Guerra# | 2.52 | 2023-2025 | |
| 7 | Héctor Aguilar# | 2.54 | 2026-2028 | |
| 8 | Blaine Stottlar# | 2.57 | 2027-2028 | |
| 9 | Pat Thompson | 2.65 | 2020-2022 | |
| 10 | Nicolas Roche# | 2.70 | 2027-2030 | |
| 11 | Billy Grange# | 2.75 | 2024-2026 | |
| 12 | Reynaldo Sánchez# | 2.94 | 2020-2023 | |
| 13 | Phil Hanson | 2.96 | 2020-2023 | |
| 14 | Felipe Casanova# | 3.00 | 2028-2031 | |
| 15 | Lincoln Spooner# | 3.01 | 2026-2028 | |
| 16 | António Rodríguez# | 3.05 | 2023-2025 | |
| 17 | Octávio Ríos# | 3.24 | 2020-2022 | |
| 18 | Edmund Blackadder# | 3.27 | 2026-2030 | |
| 19 | Gabriel Herrera# | 3.36 | 2022-2025 | |
| 19 | Barry Mullen# | 3.36 | 2028-2030 | |
| 21 | Will Hoffman# | 3.37 | 2026-2028 | |
| 22 | Bernardino Neagle | 3.48 | 2020-2023 | |
| 23 | Mike McKay# | 3.50 | 2026-2029 | |
| 24 | Garrett Schaper# | 3.64 | 2025-2030 | |
| 25 | Juan Ordóñez# | 3.87 | 2024-2026 | |
| 26 | Rhys Maskell# | 3.92 | 2031-2032 | |
| 27 | Enea Dini | 4.07 | 2020-2024 | |
| 28 | Curt Walker# | 4.28 | 2021-2023 |
