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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Francisco Burgos# | 1.77 | 2025-2028 | |
| 2 | Benjamin Busto# | 2.09 | 2025-2027 | |
| 3 | Song-saeng Kim# | 2.33 | 2021-2024 | |
| 4 | Chae-seong Kim# | 2.34 | 2021-2022 | |
| 5 | Don Bender | 2.35 | 2020-2021 | |
| 6 | Alejandro Ramos# | 2.42 | 2021-2025 | |
| 7 | Enrique Madrid | 2.45 | 2021-2023 | |
| 8 | Gonzalo Montés# | 2.47 | 2022-2026 | |
| 8 | António Marés# | 2.47 | 2021-2022 | |
| 10 | Ramiro García# | 2.49 | 2022-2024 | |
| 11 | Juan López# | 2.51 | 2020-2022 | |
| 12 | Manuel Ceja# | 2.53 | 2027-2028 | |
| 13 | Luis Hernández# | 2.56 | 2025-2026 | |
| 14 | Bob Browning# | 2.58 | 2023-2025 | |
| 15 | Osiris St. Brown# | 2.61 | 2027-2028 | |
| 16 | Roger Murdock# | 2.68 | 2026-2027 | |
| 17 | Ismael Lara# | 2.70 | 2024-2027 | |
| 18 | Armando Ortíz# | 2.71 | 2021-2025 | |
| 19 | Jon Shirley# | 2.75 | 2023-2024 | |
| 20 | Natalino Golaio# | 2.78 | 2020-2021 | |
| 21 | Rusty Swanson# | 2.80 | 2023-2025 | |
| 22 | José Santiago# | 2.83 | 2024-2027 | |
| 23 | Gabriel Escobar# | 2.97 | 2022-2025 | |
| 24 | Chet Saks# | 2.99 | 2027-2028 | |
| 24 | Alberto Solís# | 2.99 | 2025-2027 | |
| 26 | José López# | 3.00 | 2026-2028 | |
| 27 | Pang Qin# | 3.04 | 2026-2027 | |
| 28 | Morihiro Sai# | 3.06 | 2025-2027 | |
| 29 | Hänsel Freeh | 3.09 | 2020-2021 | |
| 29 | Eddie Kop# | 3.09 | 2020-2022 | |
| 31 | Ánibal Rivera# | 3.22 | 2020-2022 | |
| 32 | Loren Berdine# | 3.23 | 2027-2028 | |
| 33 | James Neutron# | 3.24 | 2024-2026 | |
| 34 | Nick Richie# | 3.26 | 2022-2024 | |
| 35 | Darius Baxa# | 3.31 | 2025-2026 | |
| 36 | Josef Strolz# | 3.32 | 2023-2025 | |
| 37 | Edward Scarborough# | 3.33 | 2026-2028 | |
| 38 | António Muñóz# | 3.37 | 2026-2027 | |
| 39 | Travis Grant# | 3.40 | 2021-2023 | |
| 40 | Pedro Adame# | 3.50 | 2026-2028 | |
| 41 | Shawn Holliday | 3.54 | 2020-2022 | |
| 42 | Javier Matajudíos# | 3.73 | 2023-2026 | |
| 43 | Felipe Pereira# | 4.12 | 2024-2027 | |
| 44 | Heyg Lamper# | 4.18 | 2025-2027 | |
| 45 | Ryan Dull# | 4.89 | 2024-2028 | |
| 46 | Santiago Carrión# | 5.15 | 2021-2022 |
