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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 | Anatoly Ivanovich | 1.666 | 2033 | |
| 5 | Nick Snyder# | 1.721 | 2053 | |
| 6 | Howard Randolph# | 1.726 | 2050 | |
| 7 | Pedro Valdéz | 1.735 | 2023 | |
| 8 | Shang-de Fu | 1.763 | 2036 | |
| 9 | Van Hileman# | 1.852 | 2042 | |
| 10 | Tom Johnston# | 1.901 | 2053 | |
| 11 | Gary Ashley | 1.933 | 2043 | |
| 12 | Jesús Silva | 1.992 | 2041 | |
| 13 | Juan Guillén* | 2.020 | 2030 | |
| 14 | Walt Coffman* | 2.045 | 2031 | |
| 15 | Torvald Geertsen | 2.058 | 2019 | |
| 16 | Anatoly Ivanovich | 2.071 | 2032 | |
| 17 | Jorge Otero* | 2.077 | 2030 | |
| 18 | Ryan Davis* | 2.085 | 2019 | |
| 19 | Bobby Swain | 2.095 | 2023 | |
| 20 | Jason Hubbell | 2.118 | 2022 | |
| 21 | Janghyun Han# | 2.123 | 2049 | |
| 22 | Jay Newton# | 2.133 | 2047 | |
| 23 | Javier Mora | 2.137 | 2026 | |
| 24 | Bartolomeu Lio | 2.154 | 2021 | |
| 25 | Tony Alfonso* | 2.178 | 2035 | |
| 26 | Nathaniel Riley | 2.198 | 2021 | |
| 27 | Pedro Valdéz | 2.202 | 2027 | |
| 28 | Alton Westrich# | 2.208 | 2044 | |
| 29 | Lou Hartling | 2.216 | 2022 | |
| 30 | Eddie Kop* | 2.217 | 2034 | |
| 31 | Jesús Gonzáles* | 2.224 | 2020 | |
| 32 | Manuel Martínez# | 2.233 | 2049 | |
| 33 | Pedro Alejándrez* | 2.235 | 2022 | |
| 34 | Octavius Pringle | 2.236 | 2033 | |
| 35 | Bungay Osiman# | 2.244 | 2050 | |
| 35 | Gordon Benjamin# | 2.244 | 2053 | |
| 37 | Pedro Alejándrez* | 2.250 | 2023 | |
| 38 | Larry Benítez# | 2.255 | 2052 | |
| 39 | Germán Rodríguez | 2.259 | 2028 | |
| 40 | Francis McBride | 2.280 | 2025 | |
| 41 | Eddie Kop* | 2.281 | 2025 | |
| 42 | Eijiro Takahashi | 2.283 | 2030 | |
| 43 | Lorenzo Fabián | 2.295 | 2032 | |
| 44 | Ray Harrison# | 2.339 | 2051 | |
| 45 | Roberto Ortega | 2.343 | 2018 | |
| 46 | Jorge Otero* | 2.348 | 2040 | |
| 46 | Wes Hamm* | 2.348 | 2024 | |
| 48 | Juan Guillén* | 2.355 | 2029 | |
| 49 | George Frazier | 2.358 | 2022 | |
| 50 | Tony Alfonso* | 2.360 | 2032 | |
| 51 | Rusty Swanson | 2.368 | 2037 | |
| 51 | David Buchanan | 2.368 | 2033 | |
| 53 | Natalino Golaio | 2.370 | 2027 | |
| 54 | Matthew Fallows | 2.372 | 2037 | |
| 55 | Chase Sims | 2.374 | 2042 | |
| 56 | Cory Sanders | 2.375 | 2026 | |
| 57 | Todd Hines* | 2.379 | 2025 | |
| 57 | Juan Guillén* | 2.379 | 2028 | |
| 59 | Stuart Lee | 2.386 | 2021 | |
| 60 | Chase Davis# | 2.388 | 2049 | |
| 61 | Ángel Navarro | 2.389 | 2027 | |
| 62 | Greg White | 2.394 | 2025 | |
| 63 | John Wilkins* | 2.398 | 2016 | |
| 64 | Eddie Kop* | 2.401 | 2026 | |
| 65 | Walt Coffman* | 2.402 | 2032 | |
| 66 | Keisuke Nishida | 2.444 | 2028 | |
| 67 | Bungay Osiman# | 2.447 | 2051 | |
| 68 | Gerardo Pagán | 2.448 | 2027 | |
| 68 | Dave Lewis# | 2.448 | 2050 | |
| 70 | Lou Hartling | 2.459 | 2023 | |
| 71 | Nicholas Wells | 2.460 | 2021 | |
| 72 | Wayne Craig | 2.461 | 2019 | |
| 73 | Jeff McFarland# | 2.468 | 2051 | |
| 74 | John Woods | 2.470 | 2026 | |
| 75 | Lewis Thompson# | 2.483 | 2052 | |
| 76 | Anatoly Ivanovich | 2.487 | 2034 | |
| 77 | Jesús Vidro | 2.503 | 2034 | |
| 78 | Guy Riggs# | 2.512 | 2052 | |
| 79 | Addie Samson | 2.517 | 2028 | |
| 80 | Joaquín Herrera# | 2.519 | 2053 | |
| 81 | Paul Haines | 2.521 | 2048 | |
| 81 | John Dempsey | 2.521 | 2022 | |
| 83 | Dave Goode | 2.524 | 2022 | |
| 84 | Jesús Vidro | 2.526 | 2037 | |
| 85 | Janghyun Han# | 2.530 | 2048 | |
| 86 | Wayne Craig | 2.533 | 2023 | |
| 87 | Travis Morgan | 2.534 | 2042 | |
| 88 | Pedro Valdéz | 2.540 | 2024 | |
| 89 | John Wilkins* | 2.543 | 2025 | |
| 90 | Aurelio López | 2.546 | 2026 | |
| 91 | Earl Hurdle# | 2.547 | 2051 | |
| 92 | Kevin Brown# | 2.551 | 2051 | |
| 93 | Javier Roldán | 2.554 | 2025 | |
| 94 | Mario Gonzáles# | 2.564 | 2050 | |
| 95 | Kevin Nogilny | 2.568 | 2036 | |
| 95 | Paul Haines | 2.568 | 2042 | |
| 97 | Kyle Chambers# | 2.571 | 2052 | |
| 98 | Janghyun Han# | 2.584 | 2051 | |
| 98 | Raúl Gómez | 2.584 | 2027 | |
| 100 | Wes Hamm* | 2.591 | 2023 |
