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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Lodewijk Kluin | 1.809 | 2023-2033 | |
| 2 | Félix García | 1.815 | 2025-2032 | |
| 3 | Rafael Salgado | 1.969 | 2024-2028 | |
| 4 | Jeff Brantley | 2.019 | 2018-2031 | |
| 5 | Clay Bingham | 2.032 | 2046-2052 | |
| 6 | Bobby Wright# | 2.045 | 2050-2058 | |
| 7 | Chris Drover | 2.160 | 2024-2033 | |
| 8 | Leonardo González# | 2.170 | 2049-2057 | |
| 9 | Brad Peckford# | 2.229 | 2049-2058 | |
| 10 | Anastasio Quintana | 2.298 | 2023-2035 | |
| 11 | Charles van Es | 2.500 | 2025-2030 | |
| 12 | Gustavo Medina | 2.543 | 2022-2031 | |
| 13 | Garth Gunn# | 2.558 | 2049-2056 | |
| 14 | Stanley Benson | 2.585 | 2024-2031 | |
| 15 | Ramón Mendoza | 2.670 | 2023-2026 | |
| 16 | José Morales | 2.727 | 2026-2031 | |
| 17 | Mark Reardon# | 2.793 | 2051-2058 | |
| 18 | Jorge Cintrón | 3.191 | 2027-2030 | |
| 19 | Josh Taylor | 3.456 | 2025-2031 | |
| 20 | Román Sánchez | 3.582 | 2037-2046 | |
| 21 | Jesús Vargas | 3.600 | 2026-2029 | |
| 22 | Tony Nelson | 3.619 | 2028-2040 | |
| 23 | Anastasio Vázquez | 3.635 | 2025-2030 | |
| 24 | Javier Bautista | 3.724 | 2024-2032 | |
| 25 | Cristóbal Hernández | 3.837 | 2027-2042 | |
| 26 | Domingo Anaya | 3.888 | 2023-2030 | |
| 27 | Hyun-sik Chang | 3.938 | 2030-2043 | |
| 28 | Tom Young | 3.942 | 2018-2029 | |
| 29 | Jesús Ramos | 4.008 | 2024-2042 | |
| 30 | Abel Gibson | 4.011 | 2029-2036 | |
| 31 | Salvador Romero | 4.109 | 2028-2041 | |
| 32 | Domingo Campa | 4.343 | 2025-2032 | |
| 33 | Todd Jones# | 4.408 | 2048-2058 | |
| 34 | Octávio Gonzáles | 4.451 | 2023-2034 | |
| 35 | Carter Curtis | 4.471 | 2027-2032 | |
| 36 | José Zúñiga | 4.580 | 2026-2033 | |
| 37 | Mario López | 4.781 | 2022-2037 | |
| 38 | Christopher Robinson | 4.832 | 2017-2027 | |
| 39 | Gord Downie | 4.840 | 2029-2034 | |
| 40 | Tony Caraballo | 5.034 | 2028-2037 | |
| 41 | Tim Humphrey | 5.130 | 2026-2029 | |
| 42 | José Olvera | 5.277 | 2023-2038 | |
| 43 | Marcos Medina | 5.529 | 2025-2037 | |
| 44 | Luis Valenzuela | 5.684 | 2022-2036 | |
| 45 | Barrett Woods | 5.870 | 2018-2031 | |
| 46 | Jeff Doane# | 6.000 | 2049-2053 | |
| 47 | Cody Lee | 6.525 | 2029-2037 | |
| 48 | Arturo Rodríguez | 6.917 | 2021-2030 | |
| 49 | José Sánchez | 7.175 | 2018-2030 | |
| 50 | Luis Reyes | 7.500 | 2019-2026 | |
| 51 | Héctor Romero | 7.794 | 2024-2029 |
