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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Javier Mora | 1.401 | 2023 | |
| 2 | Pat Butler# | 1.543 | 2053 | |
| 3 | Bobby Swain | 1.651 | 2022 | |
| 4 | Noud Taaij# | 1.658 | 2054 | |
| 5 | Anatoly Ivanovich | 1.666 | 2033 | |
| 6 | Rodrigo García# | 1.718 | 2054 | |
| 7 | Nick Snyder# | 1.721 | 2053 | |
| 8 | Howard Randolph# | 1.726 | 2050 | |
| 9 | Puhi Paselio# | 1.728 | 2060 | |
| 10 | Pedro Valdéz | 1.735 | 2023 | |
| 11 | Shang-de Fu | 1.763 | 2036 | |
| 12 | Al Ivey# | 1.804 | 2060 | |
| 13 | Wing-fung Quan | 1.821 | 2054 | |
| 14 | Gregory Collins | 1.824 | 2055 | |
| 15 | Van Hileman* | 1.852 | 2042 | |
| 16 | Tom Johnston# | 1.901 | 2053 | |
| 17 | Bobby Monroe# | 1.929 | 2062 | |
| 18 | Gary Ashley* | 1.933 | 2043 | |
| 19 | Jesús Silva | 1.992 | 2041 | |
| 20 | P.J. O'Day# | 2.008 | 2061 | |
| 21 | Scott Bishop# | 2.014 | 2055 | |
| 22 | Juan Guillén* | 2.020 | 2030 | |
| 23 | Van Hileman* | 2.029 | 2055 | |
| 24 | Cheol-han Cho# | 2.032 | 2055 | |
| 25 | Alex Thompson# | 2.040 | 2057 | |
| 26 | Walt Coffman* | 2.045 | 2031 | |
| 27 | Torvald Geertsen | 2.058 | 2019 | |
| 28 | Anatoly Ivanovich | 2.071 | 2032 | |
| 29 | Noud Taaij# | 2.077 | 2056 | |
| 29 | Jorge Otero* | 2.077 | 2030 | |
| 31 | Ryan Davis* | 2.085 | 2019 | |
| 32 | Bobby Swain | 2.095 | 2023 | |
| 33 | Noud Taaij# | 2.098 | 2058 | |
| 34 | Sloppy Thurston# | 2.104 | 2061 | |
| 35 | Jason Hubbell | 2.118 | 2022 | |
| 36 | Janghyun Han# | 2.123 | 2049 | |
| 37 | Jay Newton | 2.133 | 2047 | |
| 38 | Javier Mora | 2.137 | 2026 | |
| 39 | Bartolomeu Lio | 2.154 | 2021 | |
| 40 | Tony Alfonso* | 2.178 | 2035 | |
| 41 | José Salinas# | 2.197 | 2056 | |
| 42 | Nathaniel Riley | 2.198 | 2021 | |
| 43 | Alex Thompson# | 2.200 | 2055 | |
| 44 | Pedro Valdéz | 2.202 | 2027 | |
| 45 | Alton Westrich | 2.208 | 2044 | |
| 46 | Tom Johnston# | 2.215 | 2055 | |
| 47 | Lou Hartling | 2.216 | 2022 | |
| 48 | Eddie Kop* | 2.217 | 2034 | |
| 49 | Jesús Gonzáles* | 2.224 | 2020 | |
| 50 | Brandon Fox# | 2.230 | 2059 | |
| 51 | Manuel Martínez | 2.233 | 2049 | |
| 52 | Pedro Alejándrez* | 2.235 | 2022 | |
| 53 | Octavius Pringle | 2.236 | 2033 | |
| 54 | Bungay Osiman | 2.244 | 2050 | |
| 54 | Gordon Benjamin | 2.244 | 2053 | |
| 56 | Alex Thompson# | 2.250 | 2056 | |
| 56 | Pedro Alejándrez* | 2.250 | 2023 | |
| 58 | Larry Benítez | 2.255 | 2052 | |
| 59 | Germán Rodríguez | 2.259 | 2028 | |
| 60 | Howard Randolph# | 2.268 | 2055 | |
| 61 | Aaron Daniels# | 2.270 | 2055 | |
| 62 | Francis O'Farrell# | 2.276 | 2058 | |
| 63 | Francis McBride | 2.280 | 2025 | |
| 64 | Eddie Kop* | 2.281 | 2025 | |
| 65 | Eijiro Takahashi | 2.283 | 2030 | |
| 66 | Lorenzo Fabián | 2.295 | 2032 | |
| 67 | David White# | 2.299 | 2061 | |
| 68 | Ray Harrison | 2.339 | 2051 | |
| 69 | Roberto Ortega | 2.343 | 2018 | |
| 70 | Devin Hancock# | 2.348 | 2060 | |
| 70 | Wes Hamm* | 2.348 | 2024 | |
| 70 | Jorge Otero* | 2.348 | 2040 | |
| 73 | Juan Guillén* | 2.355 | 2029 | |
| 74 | George Frazier | 2.358 | 2022 | |
| 75 | Tony Alfonso* | 2.360 | 2032 | |
| 76 | David Buchanan | 2.368 | 2033 | |
| 76 | Rusty Swanson | 2.368 | 2037 | |
| 78 | Natalino Golaio | 2.370 | 2027 | |
| 79 | Barry Davis# | 2.371 | 2062 | |
| 80 | Matthew Fallows | 2.372 | 2037 | |
| 81 | Chase Sims | 2.374 | 2042 | |
| 82 | Cory Sanders | 2.375 | 2026 | |
| 83 | Todd Hines* | 2.379 | 2025 | |
| 83 | Juan Guillén* | 2.379 | 2028 | |
| 85 | Luis Rojas# | 2.386 | 2061 | |
| 85 | Stuart Lee | 2.386 | 2021 | |
| 87 | Chase Davis | 2.388 | 2049 | |
| 88 | Ángel Navarro | 2.389 | 2027 | |
| 89 | Nick Long# | 2.394 | 2054 | |
| 89 | Greg White | 2.394 | 2025 | |
| 91 | John Wilkins* | 2.398 | 2016 | |
| 92 | Eddie Kop* | 2.401 | 2026 | |
| 93 | Walt Coffman* | 2.402 | 2032 | |
| 94 | Jesús Rosas# | 2.434 | 2057 | |
| 95 | Keisuke Nishida | 2.444 | 2028 | |
| 96 | Ken Harding# | 2.447 | 2062 | |
| 96 | Bungay Osiman | 2.447 | 2051 | |
| 98 | Gerardo Pagán | 2.448 | 2027 | |
| 98 | Dave Lewis | 2.448 | 2050 | |
| 100 | Lou Hartling | 2.459 | 2023 |
