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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Kaluka Wene | 1.378 | 2026 | |
| 2 | Tomiji Saikawa | 1.742 | 2021 | |
| 3 | Bernie Sanders | 2.062 | 2026 | |
| 4 | Augusto Alfonzo# | 2.083 | 2045 | |
| 5 | Manny Amici | 2.129 | 2027 | |
| 6 | Ingo Abresch | 2.268 | 2036 | |
| 7 | Bernie Sanders | 2.312 | 2027 | |
| 8 | Santiago López | 2.326 | 2035 | |
| 9 | Bo Tubbs | 2.337 | 2023 | |
| 10 | Jason Miller | 2.367 | 2043 | |
| 11 | Ángel Flores | 2.412 | 2036 | |
| 12 | Alejandro Arteaga | 2.429 | 2022 | |
| 13 | Armando Garay | 2.439 | 2041 | |
| 14 | Jorge Valdéz# | 2.448 | 2050 | |
| 15 | Ron O'Slattery | 2.462 | 2023 | |
| 16 | Raimo Kangas | 2.470 | 2039 | |
| 17 | Manuel Peña# | 2.485 | 2053 | |
| 18 | Michael Galloway# | 2.500 | 2050 | |
| 19 | Jason Miller | 2.501 | 2051 | |
| 20 | Keith Lynskey# | 2.503 | 2046 | |
| 21 | Willie Cameron | 2.512 | 2024 | |
| 22 | Ángel Flores | 2.536 | 2037 | |
| 23 | Michael Shepard# | 2.547 | 2050 | |
| 24 | Tong-kyu Ko# | 2.571 | 2052 | |
| 25 | Ren-qing Weng | 2.579 | 2041 | |
| 26 | Jeff Sloan | 2.602 | 2021 | |
| 27 | Jamie Miller# | 2.624 | 2050 | |
| 28 | Kane Hallworth# | 2.638 | 2052 | |
| 29 | Salvador Heredia# | 2.658 | 2053 | |
| 30 | Jeff Sloan | 2.675 | 2022 | |
| 31 | Manuel Franco | 2.691 | 2024 | |
| 32 | Jared Cox | 2.692 | 2023 | |
| 33 | Manuel Paílla | 2.707 | 2036 | |
| 34 | Gabel Ambrosius# | 2.708 | 2045 | |
| 35 | Jing-quo Ts'ai# | 2.714 | 2045 | |
| 36 | Wally Wilkerson | 2.718 | 2025 | |
| 37 | Kenny Kawaguchi | 2.737 | 2031 | |
| 38 | Tomiji Saikawa | 2.746 | 2022 | |
| 39 | Isaaka Ienimea | 2.766 | 2034 | |
| 40 | Robert O'Reilly# | 2.781 | 2052 | |
| 41 | Clément Moreno | 2.788 | 2046 | |
| 42 | Elvin Olson# | 2.793 | 2053 | |
| 42 | James Scott | 2.793 | 2023 | |
| 44 | Fernando González | 2.825 | 2023 | |
| 45 | Luis Cuero | 2.827 | 2030 | |
| 46 | Zalontae Hillary | 2.860 | 2030 | |
| 47 | Eduardo Bravo | 2.865 | 2024 | |
| 48 | Sean Murphy# | 2.874 | 2046 | |
| 49 | Cooper Carroll# | 2.884 | 2046 | |
| 50 | Aiden Dubhghall | 2.893 | 2035 | |
| 51 | Peter Bradley# | 2.895 | 2050 | |
| 52 | Wally Nelson | 2.907 | 2021 | |
| 53 | Jesús Franco | 2.925 | 2025 | |
| 54 | Nebosja Draskovic | 2.938 | 2033 | |
| 55 | Ingo Abresch | 2.941 | 2037 | |
| 56 | Chris Sommer | 2.947 | 2028 | |
| 57 | Don Cunningham | 2.952 | 2021 | |
| 58 | Dave Bass# | 2.956 | 2053 | |
| 59 | Manny Burgos | 2.960 | 2038 | |
| 60 | Greg King# | 2.964 | 2046 | |
| 61 | Valentín Rivera | 2.973 | 2027 | |
| 62 | Joe Pruitt | 2.975 | 2030 | |
| 63 | Asher Mouland | 3.007 | 2048 | |
| 64 | Roy Head# | 3.008 | 2051 | |
| 65 | Gabe Stephenson | 3.028 | 2027 | |
| 66 | Marcos Germán | 3.043 | 2036 | |
| 67 | Wayne Hayes | 3.048 | 2020 | |
| 68 | Sean Murphy# | 3.062 | 2045 | |
| 69 | Dave Bass# | 3.076 | 2052 | |
| 70 | Manuel Pader | 3.078 | 2025 | |
| 71 | Greguorio Espora | 3.094 | 2037 | |
| 72 | Jerry Kumpf | 3.101 | 2036 | |
| 73 | Kenny Kawaguchi | 3.113 | 2030 | |
| 74 | James Scott | 3.115 | 2026 | |
| 75 | Coy Broderick | 3.118 | 2037 | |
| 76 | Ed Emery | 3.130 | 2048 | |
| 77 | Jason McKinney | 3.138 | 2020 | |
| 78 | Robert Shirt# | 3.140 | 2053 | |
| 79 | Jesús Silva | 3.145 | 2037 | |
| 80 | Michael Brown | 3.147 | 2024 | |
| 81 | Bryan Houston | 3.149 | 2020 | |
| 82 | Hyeong-ro Yi# | 3.157 | 2053 | |
| 83 | António Marés | 3.159 | 2036 | |
| 84 | José Zamora# | 3.161 | 2052 | |
| 85 | Javier Romero | 3.167 | 2031 | |
| 86 | Kirby Buckner | 3.184 | 2024 | |
| 87 | Alfredo Ríos | 3.186 | 2025 | |
| 88 | Gabriel Valenzuela | 3.191 | 2035 | |
| 89 | Raimo Kangas | 3.194 | 2040 | |
| 90 | Tim O'Heyne# | 3.196 | 2048 | |
| 91 | Yasunobu Suisha | 3.203 | 2044 | |
| 92 | Jorge Castillo | 3.216 | 2029 | |
| 93 | Chris Sommer | 3.225 | 2032 | |
| 94 | Hikaru Yamaguchi | 3.227 | 2032 | |
| 95 | Jay Mahabir | 3.237 | 2041 | |
| 95 | Daniel Ryan | 3.237 | 2035 | |
| 97 | Raúl González# | 3.238 | 2044 | |
| 98 | Jing-quo Ts'ai# | 3.240 | 2050 | |
| 99 | Pedro Arredondo# | 3.243 | 2044 | |
| 100 | Rodger de Meza | 3.252 | 2023 |
