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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Juan Acevedo | 1.500 | 2020-2026 | |
| 1 | Natsuo Kono | 1.500 | 2053-2057 | |
| 3 | Harold Aspell | 2.032 | 2025-2027 | |
| 4 | Hercules Argos | 2.250 | 2056-2062 | |
| 5 | Félix Hernández | 2.277 | 2027-2028 | |
| 6 | Jorge Cintrón | 2.700 | 2026-2027 | |
| 7 | Jimmy Greenwood | 2.950 | 2026-2045 | |
| 8 | Abel Gibson | 2.972 | 2028-2035 | |
| 9 | José Guerra | 3.031 | 2022-2025 | |
| 10 | José Rosas | 3.068 | 2027-2031 | |
| 11 | Hani Goddard# | 3.094 | 2044-2054 | |
| 12 | Jesús Pacheco | 3.300 | 2023-2027 | |
| 13 | Brent Strom | 3.432 | 2050-2056 | |
| 14 | Javier Velázquez | 3.489 | 2025-2031 | |
| 15 | José Pezina | 3.661 | 2022-2029 | |
| 16 | Juan Rodríguez | 3.857 | 2024-2034 | |
| 17 | Enrique Rivera | 3.894 | 2055-2060 | |
| 18 | Curtis Barnes | 4.355 | 2027-2031 | |
| 19 | José Gallegos | 4.684 | 2023-2027 | |
| 20 | José Rodríguez# | 5.100 | 2056-2062 | |
| 21 | John Campbell Jr. | 5.452 | 2028-2036 | |
| 22 | José López | 5.567 | 2036-2046 | |
| 23 | José Castillo | 5.745 | 2021-2034 | |
| 24 | Salvador Gonzáles | 5.786 | 2027-2035 | |
| 25 | Dan O'Manning | 6.000 | 2027-2036 | |
| 26 | Ramiro Medina | 6.480 | 2050-2054 |
