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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Andrew Hayes | 2.143 | 2022 | |
| 2 | Jesús Vidro# | 2.155 | 2032 | |
| 3 | Alin Oanta | 2.203 | 2025 | |
| 4 | Ryan Bentley# | 2.212 | 2029 | |
| 5 | Bradley Roth# | 2.245 | 2032 | |
| 6 | Santiago Alonza# | 2.257 | 2026 | |
| 7 | Seong-rae Park# | 2.436 | 2027 | |
| 8 | Zach Rediker# | 2.508 | 2028 | |
| 9 | Seong-rae Park# | 2.521 | 2026 | |
| 10 | Santiago Alonza# | 2.584 | 2025 | |
| 11 | Bob Browning# | 2.616 | 2027 | |
| 12 | Octávio Fernández# | 2.644 | 2027 | |
| 13 | Brian Morris# | 2.649 | 2028 | |
| 14 | Mike Owens | 2.670 | 2026 | |
| 15 | Stewart Fleming | 2.673 | 2028 | |
| 16 | Santo Velazco# | 2.724 | 2030 | |
| 17 | Edgar Martínez | 2.727 | 2022 | |
| 18 | Ezio Deodato | 2.747 | 2024 | |
| 19 | Gabriel Hernández | 2.751 | 2024 | |
| 20 | Jeff Hale | 2.754 | 2026 | |
| 21 | Cory Sanders# | 2.757 | 2020 | |
| 21 | Roger Rodenburg# | 2.757 | 2035 | |
| 23 | Ismael Calderón# | 2.769 | 2033 | |
| 24 | Dave Mitchell | 2.791 | 2024 | |
| 24 | Gustavo Tobías# | 2.791 | 2031 | |
| 26 | Nam Yee Yong# | 2.807 | 2029 | |
| 27 | Aki Tanaka | 2.838 | 2020 | |
| 27 | Mal Houser# | 2.838 | 2028 | |
| 29 | Claudio Díaz | 2.888 | 2027 | |
| 30 | Rodas Aguilar# | 2.893 | 2035 | |
| 31 | Ricardo Rodríguez# | 2.895 | 2027 | |
| 32 | Arturo Gramer# | 2.904 | 2034 | |
| 33 | Ricardo Gómez | 2.917 | 2022 | |
| 33 | Hidehira Matsuda | 2.917 | 2023 | |
| 35 | Ismael Calderón# | 2.924 | 2032 | |
| 36 | Juan López | 2.926 | 2029 | |
| 37 | Raúl Areola | 2.962 | 2028 | |
| 38 | Joseph Reed | 2.972 | 2022 | |
| 39 | Surrealiste Zhejna# | 3.017 | 2035 | |
| 40 | Ángel Navarro# | 3.044 | 2024 | |
| 41 | César Vatgos | 3.045 | 2021 | |
| 42 | Shawn Williams# | 3.047 | 2026 | |
| 43 | Luis Flores# | 3.055 | 2022 | |
| 44 | Cisco Andr# | 3.064 | 2034 | |
| 45 | Víctor García# | 3.068 | 2022 | |
| 46 | Jimmy Whittier | 3.075 | 2022 | |
| 47 | Tony Solíz# | 3.090 | 2027 | |
| 48 | Manuel Montés | 3.096 | 2028 | |
| 49 | Bryan Palmer | 3.100 | 2026 | |
| 50 | Alejandro Guerra# | 3.125 | 2026 | |
| 51 | Atila Freska# | 3.128 | 2030 | |
| 52 | Octávio Fernández# | 3.135 | 2028 | |
| 53 | Surrealiste Zhejna# | 3.161 | 2034 | |
| 54 | Anthony Hanover | 3.163 | 2022 | |
| 55 | Santiago López# | 3.185 | 2029 | |
| 56 | Alin Oanta | 3.203 | 2020 | |
| 57 | Armando Hernández | 3.208 | 2020 | |
| 58 | José Granados | 3.246 | 2020 | |
| 59 | Herman Barnes | 3.275 | 2020 | |
| 60 | Eduardo Molina | 3.283 | 2032 | |
| 60 | Alejandro Ramírez# | 3.283 | 2035 | |
| 62 | Prince Nakamura | 3.305 | 2025 | |
| 63 | John Hamilton | 3.306 | 2024 | |
| 64 | Marnix van Rijn# | 3.309 | 2034 | |
| 65 | Jeff Bradshaw# | 3.321 | 2031 | |
| 66 | Daniel Martínez# | 3.346 | 2025 | |
| 67 | Jesús Fernández# | 3.348 | 2035 | |
| 68 | George Armstrong | 3.375 | 2025 | |
| 68 | Preston Vick | 3.375 | 2026 | |
| 70 | Alejandro Arteaga | 3.391 | 2027 | |
| 71 | Naozane Kobayashi# | 3.397 | 2034 | |
| 72 | Ramón Martínez# | 3.409 | 2034 | |
| 73 | Francisco Chávez | 3.421 | 2026 | |
| 74 | Augusto Ramos | 3.425 | 2028 | |
| 75 | Howard Finch | 3.462 | 2027 | |
| 76 | Miguel Aguilar# | 3.473 | 2026 | |
| 77 | Morlack Spurgeon# | 3.477 | 2027 | |
| 78 | Taylor Minor | 3.486 | 2020 | |
| 79 | Bill Lee | 3.489 | 2029 | |
| 80 | Jaime Venditti | 3.493 | 2023 | |
| 81 | Jeremy G. Wentworth | 3.500 | 2029 | |
| 82 | Brad Cunnick | 3.501 | 2023 | |
| 83 | Dave Morse | 3.506 | 2028 | |
| 84 | Shawn Arnold | 3.515 | 2025 | |
| 85 | Júlio Martínez | 3.529 | 2024 | |
| 86 | Will Hoffman# | 3.534 | 2031 | |
| 87 | Brewster Warble# | 3.538 | 2028 | |
| 88 | Naozane Kobayashi# | 3.546 | 2035 | |
| 89 | Kenshin Koike | 3.548 | 2028 | |
| 90 | Prince Nakamura | 3.553 | 2026 | |
| 91 | Gustavo Pérez# | 3.565 | 2026 | |
| 92 | Neil Franson# | 3.595 | 2029 | |
| 92 | Forest Stanley# | 3.595 | 2033 | |
| 94 | Morlack Spurgeon# | 3.596 | 2028 | |
| 94 | Francisco Burgos | 3.596 | 2030 | |
| 96 | Risto Hannila# | 3.614 | 2031 | |
| 97 | Luis Miguel Rojas | 3.617 | 2021 | |
| 98 | Damien Hayward# | 3.632 | 2030 | |
| 99 | Augusto Ramos | 3.635 | 2026 | |
| 99 | Currito Melena# | 3.635 | 2032 |
