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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | John Wood# | 0.557 | 2029-2031 | |
| 2 | Matt J Miller | 0.865 | 2003-2016 | |
| 3 | Barry Zito | 1.459 | 2000-2014 | |
| 4 | Dan Woods# | 1.530 | 2023-2031 | |
| 5 | Leo Erickson# | 1.549 | 2022-2029 | |
| 6 | Duane Wilson | 1.588 | 2008-2020 | |
| 7 | Alfredo Gómez# | 1.785 | 2028-2031 | |
| 8 | António Ortíz | 1.853 | 2002-2011 | |
| 9 | Jason Dickson | 1.929 | 1997-2006 | |
| 10 | Brad Cochran | 2.077 | 2019-2027 | |
| 10 | Chad Qualls | 2.077 | 2006-2020 | |
| 12 | A J Burnett | 2.150 | 1999-2010 | |
| 13 | Ronald Moyer# | 2.160 | 2023-2031 | |
| 14 | Henry Moss# | 2.177 | 2019-2029 | |
| 15 | Paul Hale# | 2.193 | 2020-2031 | |
| 16 | Randy D Johnson | 2.204 | 1988-2003 | |
| 17 | Santiago Herrera | 2.208 | 2000-2018 | |
| 18 | Scott Randall | 2.213 | 2003-2020 | |
| 19 | Kevin Walters | 2.250 | 2003-2015 | |
| 20 | Eldon Hernández | 2.274 | 2018-2026 | |
| 21 | Roger Clemens* | 2.313 | 1984-2006 | |
| 22 | Jerry Patterson | 2.352 | 2002-2015 | |
| 23 | Mark Prior* | 2.368 | 2002-2016 | |
| 24 | Heath Bell | 2.382 | 2004-2021 | |
| 25 | Amdre Nova# | 2.427 | 2030-2031 | |
| 26 | Carlos Jiménez# | 2.455 | 2021-2031 | |
| 27 | Rick Cederberg# | 2.500 | 2025-2031 | |
| 28 | Ismael Valdez* | 2.502 | 1994-2010 | |
| 29 | Cisco Castellanos# | 2.517 | 2025-2031 | |
| 30 | Carlos Cotter | 2.529 | 2008-2020 | |
| 31 | Raúl López | 2.537 | 2000-2016 | |
| 32 | Erik Bedard | 2.562 | 2004-2013 | |
| 33 | Jason Ellis | 2.586 | 2013-2027 | |
| 34 | David Nied* | 2.608 | 1992-2009 | |
| 35 | Gilberto Martínez# | 2.634 | 2025-2031 | |
| 36 | Adrian Ackermann | 2.647 | 2014-2022 | |
| 37 | Luis Anguiana# | 2.658 | 2026-2031 | |
| 38 | Brett Tomko | 2.676 | 1997-2004 | |
| 39 | Bryan Kent# | 2.717 | 2025-2031 | |
| 40 | Daron Maddox | 2.721 | 2015-2027 | |
| 41 | Clifton Jackson# | 2.734 | 2024-2029 | |
| 42 | Dennis Redden# | 2.766 | 2029-2031 | |
| 43 | Dan White | 2.769 | 2012-2021 | |
| 44 | Allen Bailey | 2.775 | 2011-2023 | |
| 45 | Robert Dixon# | 2.793 | 2019-2031 | |
| 46 | Jonathan Papelbon | 2.829 | 2008-2021 | |
| 47 | Stan Combs# | 2.842 | 2023-2031 | |
| 48 | Alfredo Huerta# | 2.859 | 2022-2030 | |
| 49 | Roger Bailey | 2.872 | 2003-2014 | |
| 50 | Dan Wilkerson# | 2.898 | 2023-2031 | |
| 51 | Jack Flaherty# | 2.899 | 2025-2031 | |
| 51 | Micah Olson# | 2.899 | 2016-2031 | |
| 53 | John Halama | 2.915 | 1998-2008 | |
| 54 | Charlie Frohwirth | 2.931 | 2012-2024 | |
| 55 | Byung-Hyun Kim | 2.935 | 1999-2014 | |
| 55 | Jake McGee | 2.935 | 2015-2023 | |
| 57 | Roy Oswalt* | 2.948 | 2001-2016 | |
| 58 | Francisco Ramírez# | 2.976 | 2017-2030 | |
| 59 | Jon Lester | 3.000 | 2008-2021 | |
| 59 | Chris Sharp# | 3.000 | 2021-2031 | |
| 59 | Justin Thompson | 3.000 | 2016-2026 | |
| 62 | Daniel Patterson | 3.022 | 2017-2029 | |
| 63 | Guillermo Mota | 3.040 | 1999-2010 | |
| 64 | Dave Pownall | 3.057 | 2014-2027 | |
| 65 | Chad Billingsley | 3.075 | 2008-2024 | |
| 66 | Cole Hamels* | 3.094 | 2007-2023 | |
| 67 | Wilford Chambers* | 3.126 | 2006-2025 | |
| 68 | Brent Strong | 3.128 | 2024-2028 | |
| 69 | Javier Vazquez* | 3.144 | 1998-2013 | |
| 70 | Eric Hurley | 3.162 | 2007-2020 | |
| 71 | Shelby Miller | 3.170 | 2016-2027 | |
| 72 | Jim Berthe# | 3.194 | 2025-2031 | |
| 73 | Jimmy Anderson | 3.200 | 1999-2011 | |
| 74 | Eduardo Vázquez# | 3.203 | 2023-2030 | |
| 74 | Gary Lefebvre | 3.203 | 2002-2016 | |
| 76 | Johan Santana | 3.224 | 2000-2015 | |
| 77 | Eddie Morgan* | 3.226 | 2005-2019 | |
| 78 | Jeff Shoemaker# | 3.231 | 2025-2031 | |
| 79 | Máximo Sánchez | 3.247 | 2015-2025 | |
| 80 | Héctor Bernal# | 3.264 | 2024-2031 | |
| 81 | Josh Fogg | 3.273 | 2001-2012 | |
| 82 | Manuel Vázquez# | 3.277 | 2024-2031 | |
| 83 | Ugueth Urbina | 3.284 | 1995-2013 | |
| 84 | Steve Karsay | 3.293 | 1993-2007 | |
| 85 | Zack Greinke* | 3.296 | 2005-2020 | |
| 86 | Gabe Johnson | 3.300 | 2019-2028 | |
| 87 | Felix Hernandez | 3.311 | 2009-2020 | |
| 88 | José Torres# | 3.313 | 2026-2031 | |
| 89 | Joba Chamberlain | 3.317 | 2012-2027 | |
| 90 | George Connolly# | 3.375 | 2018-2031 | |
| 91 | David Price | 3.402 | 2011-2019 | |
| 92 | Brandon Webb* | 3.403 | 2004-2024 | |
| 93 | Bob Schultz | 3.411 | 2013-2022 | |
| 94 | Ryan Arnold | 3.423 | 2012-2021 | |
| 95 | Gregory Burke | 3.436 | 2002-2013 | |
| 96 | Ian Kennedy | 3.457 | 2010-2019 | |
| 97 | John Lambert# | 3.462 | 2022-2031 | |
| 98 | Nolan Arnold | 3.475 | 2011-2022 | |
| 98 | Al Taylor | 3.475 | 2019-2026 | |
| 100 | Andrew Bailey | 3.484 | 2010-2021 |
