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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 | Alin Oanta# | 2.203 | 2025 | |
| 3 | Santiago Alonza# | 2.257 | 2026 | |
| 4 | Seong-rae Park# | 2.436 | 2027 | |
| 5 | Zach Rediker# | 2.508 | 2028 | |
| 6 | Seong-rae Park# | 2.521 | 2026 | |
| 7 | Santiago Alonza# | 2.584 | 2025 | |
| 8 | Bob Browning# | 2.616 | 2027 | |
| 9 | Octávio Fernández# | 2.644 | 2027 | |
| 10 | Brian Morris# | 2.649 | 2028 | |
| 11 | Mike Owens# | 2.670 | 2026 | |
| 12 | Stewart Fleming# | 2.673 | 2028 | |
| 13 | Edgar Martínez | 2.727 | 2022 | |
| 14 | Ezio Deodato# | 2.747 | 2024 | |
| 15 | Gabriel Hernández# | 2.751 | 2024 | |
| 16 | Jeff Hale | 2.754 | 2026 | |
| 17 | Cory Sanders# | 2.757 | 2020 | |
| 18 | Dave Mitchell# | 2.791 | 2024 | |
| 19 | Aki Tanaka | 2.838 | 2020 | |
| 19 | Mal Houser# | 2.838 | 2028 | |
| 21 | Claudio Díaz# | 2.888 | 2027 | |
| 22 | Ricardo Rodríguez# | 2.895 | 2027 | |
| 23 | Ricardo Gómez# | 2.917 | 2022 | |
| 23 | Hidehira Matsuda | 2.917 | 2023 | |
| 25 | Raúl Areola# | 2.962 | 2028 | |
| 26 | Joseph Reed | 2.972 | 2022 | |
| 27 | Ángel Navarro# | 3.044 | 2024 | |
| 28 | César Vatgos | 3.045 | 2021 | |
| 29 | Shawn Williams# | 3.047 | 2026 | |
| 30 | Luis Flores# | 3.055 | 2022 | |
| 31 | Víctor García# | 3.068 | 2022 | |
| 32 | Jimmy Whittier# | 3.075 | 2022 | |
| 33 | Tony Solíz# | 3.090 | 2027 | |
| 34 | Manuel Montés# | 3.096 | 2028 | |
| 35 | Bryan Palmer# | 3.100 | 2026 | |
| 36 | Alejandro Guerra# | 3.125 | 2026 | |
| 37 | Octávio Fernández# | 3.135 | 2028 | |
| 38 | Anthony Hanover# | 3.163 | 2022 | |
| 39 | Alin Oanta# | 3.203 | 2020 | |
| 40 | Armando Hernández | 3.208 | 2020 | |
| 41 | José Granados | 3.246 | 2020 | |
| 42 | Herman Barnes# | 3.275 | 2020 | |
| 43 | Prince Nakamura# | 3.305 | 2025 | |
| 44 | John Hamilton# | 3.306 | 2024 | |
| 45 | Daniel Martínez# | 3.346 | 2025 | |
| 46 | George Armstrong# | 3.375 | 2025 | |
| 46 | Preston Vick# | 3.375 | 2026 | |
| 48 | Alejandro Arteaga# | 3.391 | 2027 | |
| 49 | Francisco Chávez# | 3.421 | 2026 | |
| 50 | Augusto Ramos# | 3.425 | 2028 | |
| 51 | Howard Finch# | 3.462 | 2027 | |
| 52 | Miguel Aguilar# | 3.473 | 2026 | |
| 53 | Morlack Spurgeon# | 3.477 | 2027 | |
| 54 | Taylor Minor | 3.486 | 2020 | |
| 55 | Jaime Venditti# | 3.493 | 2023 | |
| 56 | Brad Cunnick# | 3.501 | 2023 | |
| 57 | Dave Morse# | 3.506 | 2028 | |
| 58 | Shawn Arnold# | 3.515 | 2025 | |
| 59 | Júlio Martínez# | 3.529 | 2024 | |
| 60 | Brewster Warble# | 3.538 | 2028 | |
| 61 | Kenshin Koike# | 3.548 | 2028 | |
| 62 | Prince Nakamura# | 3.553 | 2026 | |
| 63 | Gustavo Pérez# | 3.565 | 2026 | |
| 64 | Morlack Spurgeon# | 3.596 | 2028 | |
| 65 | Luis Miguel Rojas | 3.617 | 2021 | |
| 66 | Augusto Ramos# | 3.635 | 2026 | |
| 67 | Francisco Barrios# | 3.659 | 2022 | |
| 68 | Lester Gross | 3.664 | 2021 | |
| 69 | Lorenzo Sánchez# | 3.671 | 2019 | |
| 70 | John Holley | 3.689 | 2021 | |
| 71 | Reynaldo Ortíz# | 3.691 | 2021 | |
| 72 | Roberto Silva# | 3.707 | 2028 | |
| 73 | Seong-rae Park# | 3.711 | 2028 | |
| 74 | Tom McKee# | 3.724 | 2028 | |
| 74 | Augusto Ramos# | 3.724 | 2027 | |
| 76 | Gabriel Hernández# | 3.735 | 2027 | |
| 77 | Javier Tares | 3.756 | 2022 | |
| 78 | Gustavo Pérez# | 3.775 | 2025 | |
| 79 | Carlos Hernández# | 3.778 | 2024 | |
| 80 | Kenny Koehler# | 3.779 | 2025 | |
| 81 | John Keller | 3.793 | 2024 | |
| 82 | Bayram Tanaoglu# | 3.809 | 2026 | |
| 83 | Mark Collingwood# | 3.812 | 2026 | |
| 84 | Riley Breckenridge# | 3.817 | 2026 | |
| 85 | Chris Sommer# | 3.822 | 2027 | |
| 86 | Shawn Williams# | 3.839 | 2025 | |
| 87 | Joseph Reed | 3.857 | 2021 | |
| 87 | Armando Hernández | 3.857 | 2021 | |
| 87 | Eric Lang# | 3.857 | 2021 | |
| 90 | John Hamilton# | 3.869 | 2028 | |
| 90 | Edgar Capello# | 3.869 | 2023 | |
| 92 | Luis Gonzáles | 3.882 | 2020 | |
| 93 | Francisco Barrios# | 3.911 | 2023 | |
| 94 | Severiano Duclos# | 3.925 | 2025 | |
| 95 | José Guzmán# | 3.944 | 2021 | |
| 95 | Alin Oanta# | 3.944 | 2023 | |
| 97 | Stanley Neal | 3.963 | 2019 | |
| 98 | Tom Hernández | 3.976 | 2022 | |
| 99 | Ramón Molina# | 3.978 | 2023 | |
| 99 | Jurgen Sagebrecht# | 3.978 | 2026 |
