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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Roy Little# | 0.581 | 2037-2040 | |
| 2 | Henry Cluett# | 1.149 | 2029-2030 | |
| 3 | José Flores# | 1.392 | 2034-2034 | |
| 4 | Tsurayuki Harada | 1.428 | 2029-2040 | |
| 5 | René Padilla# | 1.436 | 2034-2034 | |
| 6 | Sebastiaan de Roode# | 1.444 | 2032-2033 | |
| 7 | Monzaemon Nakashima# | 1.467 | 2032-2042 | |
| 8 | Lou Butler# | 1.667 | 2029-2041 | |
| 9 | Erik Watson | 1.728 | 2024-2039 | |
| 10 | Joe Russell# | 1.761 | 2028-2037 | |
| 11 | Huibrecht Ubbens | 1.929 | 2032-2036 | |
| 12 | Domingo Vázquez | 1.954 | 2027-2036 | |
| 13 | Roberto Ruíz# | 2.020 | 2034-2036 | |
| 14 | Alfredo Zambrano | 2.032 | 2023-2025 | |
| 15 | León Vallés | 2.160 | 2009-2013 | |
| 16 | Armando Sánchez# | 2.314 | 2036-2036 | |
| 17 | Adam Pemberton# | 2.374 | 2027-2040 | |
| 18 | Dean Makepeace | 2.382 | 2032-2033 | |
| 19 | Juan Pérez | 2.455 | 2028-2040 | |
| 20 | Alfredo Reyes | 2.492 | 2027-2036 | |
| 21 | Kikaku Suzuki | 2.543 | 2022-2030 | |
| 22 | Fernando García | 2.547 | 2032-2035 | |
| 23 | Barney Stone# | 2.580 | 2028-2038 | |
| 24 | Izumo Kondo | 2.755 | 2025-2031 | |
| 25 | Min-zhong Lou# | 2.793 | 2034-2035 | |
| 26 | Marcel Osterhout# | 2.842 | 2029-2040 | |
| 27 | Marcos Alcorta | 2.885 | 2025-2030 | |
| 28 | Jorge Flores# | 2.983 | 2033-2034 | |
| 29 | Barney Swanson# | 3.000 | 2027-2042 | |
| 30 | Robinson Hernández# | 3.072 | 2028-2038 | |
| 31 | Arlen Badger | 3.124 | 2027-2039 | |
| 32 | Héctor Ventura# | 3.135 | 2033-2040 | |
| 33 | Andrew Burns | 3.166 | 2021-2033 | |
| 34 | Félix Córdova | 3.224 | 2023-2035 | |
| 35 | Robbie Dupuis | 3.375 | 2028-2040 | |
| 35 | Eisuke Sanu | 3.375 | 2020-2023 | |
| 35 | Seiichi Sakaguchi# | 3.375 | 2032-2033 | |
| 38 | Luis Miguel Freitas# | 3.423 | 2035-2040 | |
| 39 | Jim Fish | 3.477 | 2024-2037 | |
| 40 | Trey Calder# | 3.484 | 2031-2037 | |
| 41 | Barney Stevens | 3.547 | 2027-2035 | |
| 42 | Andrés Rodríguez# | 3.654 | 2030-2041 | |
| 43 | Pedro Torres# | 3.682 | 2027-2042 | |
| 44 | Eric Coleman# | 3.734 | 2039-2041 | |
| 45 | Luis Cavazos# | 3.757 | 2035-2036 | |
| 46 | Tadakuni Suzuki | 3.823 | 2024-2037 | |
| 47 | Brock Barrett | 3.857 | 2012-2025 | |
| 48 | Donald Lesher | 3.979 | 2028-2033 | |
| 49 | Ryan Coyfe# | 4.021 | 2030-2042 | |
| 50 | Felipe Aguilera# | 4.034 | 2037-2040 | |
| 51 | Emílio Martínez | 4.133 | 2032-2041 | |
| 52 | Júlio Rivera# | 4.231 | 2027-2040 | |
| 53 | Damien Neighbour# | 4.250 | 2033-2041 | |
| 54 | Kitahachi Noda | 4.459 | 2024-2040 | |
| 55 | Bill Miller# | 4.549 | 2040-2041 | |
| 56 | Juan Jose Patino | 4.590 | 2024-2038 | |
| 57 | Fernando Castro | 4.812 | 2021-2039 | |
| 58 | Seong-chae Somun | 5.769 | 2029-2039 | |
| 59 | Jin-hyun Park# | 5.824 | 2026-2042 | |
| 60 | José Espinosa# | 6.291 | 2039-2042 | |
| 61 | Darryl McClendon | 6.606 | 2017-2022 | |
| 62 | Iván Hernández# | 6.618 | 2029-2040 | |
| 63 | Salvador Ramos# | 7.043 | 2041-2041 |
