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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Reagan Wear* | 1.219 | 2022 | |
| 2 | Albert Lebel* | 1.262 | 2028 | |
| 3 | Jorge Cossutta# | 1.393 | 2047 | |
| 4 | Scott Hill* | 1.507 | 2011 | |
| 5 | Cisco Toledo# | 1.598 | 2047 | |
| 6 | Scott Hill* | 1.618 | 2010 | |
| 7 | Masutaro Koyama* | 1.619 | 2028 | |
| 8 | Wes Slaughter# | 1.651 | 2048 | |
| 9 | Wes Slaughter# | 1.653 | 2049 | |
| 10 | Scott Hill* | 1.735 | 2015 | |
| 11 | Scott Hill* | 1.775 | 2008 | |
| 12 | Joseph Reed# | 1.788 | 2047 | |
| 13 | Sergio Crivelli | 1.793 | 2043 | |
| 14 | Félix Hernández# | 1.832 | 2046 | |
| 15 | Masutaro Koyama* | 1.836 | 2026 | |
| 16 | Dae-ho Kim | 1.842 | 2034 | |
| 17 | Masutaro Koyama* | 1.854 | 2021 | |
| 18 | Jorge Cossutta# | 1.858 | 2048 | |
| 18 | Dae-ho Kim | 1.858 | 2032 | |
| 20 | Félix Hernández# | 1.894 | 2047 | |
| 21 | Albert Lebel* | 1.910 | 2025 | |
| 22 | Scott Hill* | 1.914 | 2009 | |
| 23 | Pedro Pagán# | 1.917 | 2042 | |
| 24 | Hong-ryul Yun* | 1.947 | 2033 | |
| 25 | John Garrett* | 1.962 | 2007 | |
| 26 | Scott Hill* | 1.964 | 2018 | |
| 27 | Robinson Vázquez# | 1.980 | 2046 | |
| 28 | Jules Paradis | 1.982 | 2007 | |
| 29 | Claudio Martínez | 1.995 | 2029 | |
| 30 | Wes Slaughter# | 2.000 | 2045 | |
| 31 | Mark Collins* | 2.034 | 2023 | |
| 32 | Iván Martínez# | 2.042 | 2049 | |
| 33 | José Martínez* | 2.050 | 2028 | |
| 34 | Albert Lebel* | 2.055 | 2027 | |
| 35 | Jean-Thomas Francoeur* | 2.064 | 2015 | |
| 36 | Scott Hill* | 2.071 | 2017 | |
| 37 | Dave Smeddon | 2.080 | 2027 | |
| 38 | Manuel Navarro | 2.084 | 2045 | |
| 39 | António Rijo | 2.089 | 2027 | |
| 40 | Cipriano Román | 2.091 | 2035 | |
| 41 | Joe MacAslan# | 2.095 | 2044 | |
| 42 | Masutaro Koyama* | 2.099 | 2025 | |
| 43 | Javier Rodríguez | 2.104 | 2013 | |
| 44 | Tom Crowder | 2.107 | 2014 | |
| 44 | Jorge Cossutta# | 2.107 | 2049 | |
| 46 | Osvaldo Cruz* | 2.109 | 2018 | |
| 47 | José Martínez* | 2.111 | 2029 | |
| 48 | José Martínez* | 2.166 | 2026 | |
| 49 | Matt MacKinley | 2.167 | 2044 | |
| 50 | Scott Hill* | 2.172 | 2019 | |
| 51 | Hong-ryul Yun* | 2.180 | 2034 | |
| 52 | Scott Hill* | 2.186 | 2016 | |
| 53 | Jesús De Los Santos | 2.195 | 2033 | |
| 54 | Albert Lebel* | 2.212 | 2022 | |
| 55 | Alfredo Aicón | 2.236 | 2008 | |
| 56 | Wes Slaughter# | 2.237 | 2046 | |
| 57 | José Brito | 2.243 | 2014 | |
| 58 | Dae-ho Kim | 2.247 | 2029 | |
| 59 | Manuel Navarro | 2.258 | 2044 | |
| 60 | Wes Slaughter# | 2.263 | 2047 | |
| 61 | Manuel Medina | 2.267 | 2017 | |
| 62 | Guy Harris# | 2.279 | 2045 | |
| 63 | Ben Moody | 2.285 | 2031 | |
| 64 | Carlos Clemente* | 2.289 | 2019 | |
| 65 | Scott Hill* | 2.294 | 2007 | |
| 66 | Albert Lebel* | 2.295 | 2026 | |
| 67 | Vic Niekro# | 2.303 | 2048 | |
| 68 | Dave Smeddon | 2.304 | 2030 | |
| 69 | Darrell Harding | 2.307 | 2032 | |
| 70 | José Martínez* | 2.311 | 2031 | |
| 71 | Kevin Bush* | 2.314 | 2027 | |
| 72 | Scott Hill* | 2.325 | 2013 | |
| 73 | Júlio Dávila# | 2.326 | 2047 | |
| 73 | Félix Hernández# | 2.326 | 2048 | |
| 75 | Masutaro Koyama* | 2.339 | 2027 | |
| 76 | Guy Harris# | 2.340 | 2047 | |
| 77 | Juan Gómez# | 2.344 | 2044 | |
| 78 | Kevin Bush* | 2.348 | 2022 | |
| 79 | Félix Hernández# | 2.354 | 2049 | |
| 80 | Wang Yang# | 2.368 | 2035 | |
| 81 | Étienne Garcia | 2.393 | 2020 | |
| 82 | Walter Bamber* | 2.395 | 2020 | |
| 82 | Lloyd MacBride | 2.395 | 2010 | |
| 84 | Jean-Thomas Francoeur* | 2.397 | 2013 | |
| 85 | Masutaro Koyama* | 2.398 | 2024 | |
| 86 | Ethan Pickup | 2.409 | 2011 | |
| 87 | Bob Moss | 2.413 | 2030 | |
| 88 | Jean-Thomas Francoeur* | 2.421 | 2007 | |
| 89 | Dennis McKillop# | 2.423 | 2047 | |
| 90 | Dae-ho Kim | 2.425 | 2035 | |
| 91 | Jean-Thomas Francoeur* | 2.427 | 2011 | |
| 92 | Jung Chwa | 2.435 | 2026 | |
| 93 | Daron Chandler# | 2.437 | 2043 | |
| 94 | Pat Key# | 2.438 | 2045 | |
| 95 | Keith Swanson | 2.439 | 2026 | |
| 96 | Alfredo Aicón | 2.448 | 2015 | |
| 97 | Jean-Thomas Francoeur* | 2.451 | 2009 | |
| 98 | Darrell Harding | 2.455 | 2033 | |
| 98 | Takehide Ono | 2.455 | 2024 | |
| 98 | Chuck Phillips | 2.455 | 2012 |
