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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Ken Cloude | 1.087 | 2007 | |
| 2 | Doug Ball | 1.288 | 2006 | |
| 3 | Archie Anderson | 1.479 | 2005 | |
| 4 | Carlos Cotter | 1.549 | 2004 | |
| 5 | Major Pixel | 1.620 | 2006 | |
| 6 | Mike Jordan | 1.625 | 2005 | |
| 7 | Eddie Morgan* | 1.646 | 2003 | |
| 8 | Dick Hulse | 1.722 | 2008 | |
| 9 | Dave Harrell | 1.725 | 2007 | |
| 10 | Billy Traber | 1.731 | 2003 | |
| 11 | Juan Bradley# | 1.736 | 2022 | |
| 12 | Will Terry | 1.758 | 2011 | |
| 13 | Charles Jackson | 1.783 | 2002 | |
| 14 | José Pérez | 1.817 | 2008 | |
| 15 | Mike Wood | 1.866 | 2003 | |
| 16 | Wilfredo Rodriguez | 1.882 | 2002 | |
| 17 | Tim Williams | 1.911 | 2007 | |
| 18 | Julián Martínez | 1.932 | 2005 | |
| 19 | José Escamilla | 1.941 | 2008 | |
| 20 | Pedro Castro | 1.945 | 2008 | |
| 21 | Jennie Finch | 1.972 | 2004 | |
| 22 | Joel Zumaya | 1.976 | 2008 | |
| 23 | Ken Cloude | 1.989 | 1997 | |
| 24 | José Hernández | 2.004 | 2002 | |
| 25 | Armando Ramos | 2.012 | 2006 | |
| 26 | Darren Opie# | 2.013 | 2025 | |
| 27 | António González | 2.016 | 2006 | |
| 28 | Juan Córdova# | 2.025 | 2031 | |
| 29 | Steve White | 2.033 | 2015 | |
| 30 | Rob Patterson | 2.046 | 2006 | |
| 31 | Colin Romero# | 2.069 | 2019 | |
| 32 | Jeremy Hellickson | 2.093 | 2012 | |
| 33 | Rob Johnston# | 2.107 | 2021 | |
| 34 | Ángel Frías | 2.121 | 2007 | |
| 35 | Rubén Díaz# | 2.132 | 2023 | |
| 36 | Jason Covington | 2.137 | 2005 | |
| 37 | Pablo Salazar | 2.146 | 2001 | |
| 38 | Garth Vaughn | 2.147 | 2005 | |
| 39 | Paul Williams | 2.154 | 2008 | |
| 39 | Lance Lynn | 2.154 | 2013 | |
| 41 | Phil Lawler | 2.184 | 2006 | |
| 42 | Craig Breslow | 2.202 | 2006 | |
| 43 | Jason Adams | 2.203 | 2013 | |
| 44 | Jason Willis | 2.204 | 2007 | |
| 45 | Kevin Hunnicutt | 2.226 | 2007 | |
| 46 | Diego Madraso | 2.231 | 2003 | |
| 47 | Will Davidson | 2.237 | 2005 | |
| 48 | Mike Evans | 2.246 | 2009 | |
| 49 | Mike Campbell | 2.266 | 2005 | |
| 50 | Orlando García# | 2.276 | 2029 | |
| 51 | Takashi Saito | 2.278 | 2008 | |
| 52 | Melvin Dunn | 2.284 | 2013 | |
| 53 | Curt Hayes | 2.296 | 2018 | |
| 54 | Robert Weaver | 2.297 | 2014 | |
| 55 | Will Porter | 2.312 | 2006 | |
| 56 | Carlos Crus | 2.326 | 2009 | |
| 57 | Mark Rose | 2.332 | 2006 | |
| 58 | Cody Wade | 2.338 | 2006 | |
| 58 | Dustin Sterling | 2.338 | 2022 | |
| 60 | Barry Cross | 2.350 | 2019 | |
| 61 | Alex Gibson | 2.353 | 2018 | |
| 62 | Scott Battle | 2.358 | 2014 | |
| 63 | Melis Velthuizen# | 2.362 | 2029 | |
| 63 | Jason Townsend# | 2.362 | 2022 | |
| 65 | Matt Garza | 2.366 | 2007 | |
| 66 | John Lannan | 2.374 | 2008 | |
| 67 | Nick Davis | 2.378 | 2006 | |
| 68 | Glen Clement# | 2.379 | 2019 | |
| 69 | Rich Looper | 2.384 | 2016 | |
| 70 | Mitch Ward | 2.392 | 2008 | |
| 71 | Victor Dunlap | 2.393 | 2007 | |
| 72 | César Delgado | 2.394 | 2004 | |
| 73 | Yovani Gallardo | 2.397 | 2009 | |
| 74 | Randy Sutton | 2.402 | 2005 | |
| 75 | Bob Foreman | 2.413 | 2008 | |
| 76 | John Owens | 2.422 | 2012 | |
| 77 | Austin Braden | 2.423 | 2006 | |
| 78 | Freddy Castellanos | 2.444 | 2005 | |
| 78 | Iván Alcocer | 2.444 | 2007 | |
| 80 | Kyle McClellan | 2.450 | 2013 | |
| 81 | Jennie Finch | 2.463 | 2003 | |
| 82 | Mike Jeoffrey# | 2.465 | 2029 | |
| 83 | Luis Castaneda | 2.470 | 2012 | |
| 84 | Gabriel Antúnez# | 2.471 | 2031 | |
| 85 | Travis Russell | 2.475 | 2002 | |
| 85 | Tony Ramírez | 2.475 | 2002 | |
| 87 | Maurice Valentín# | 2.476 | 2023 | |
| 87 | Máximo Cruz | 2.476 | 2021 | |
| 89 | Stanley Glavine | 2.477 | 2011 | |
| 90 | Matt Wagner | 2.489 | 1997 | |
| 91 | Aaron Goodman | 2.491 | 2002 | |
| 92 | Chien-Ming Wang | 2.502 | 2007 | |
| 93 | Greg Springer# | 2.505 | 2020 | |
| 93 | Aaron Heilman | 2.505 | 2003 | |
| 95 | Glen Casey | 2.513 | 2006 | |
| 96 | Jim Keith# | 2.518 | 2023 | |
| 97 | Nelson Sandoval | 2.519 | 2014 | |
| 98 | Madison Bumgarner | 2.523 | 2012 | |
| 99 | Kyle Dawson | 2.527 | 2007 | |
| 100 | Armando Pérez# | 2.530 | 2022 |
