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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Archie Esparza# | 2.655 | 2025-2031 | |
| 2 | Roger Clemens* | 2.721 | 1984-2006 | |
| 3 | Victor Moret | 2.799 | 2003-2016 | |
| 4 | Wilford Chambers* | 2.810 | 2006-2025 | |
| 5 | Joe Sparks | 2.845 | 2007-2019 | |
| 6 | Gregory Burke | 2.894 | 2002-2013 | |
| 7 | Bob Jenkins* | 3.007 | 2008-2023 | |
| 8 | Danny Patterson | 3.073 | 1996-2010 | |
| 9 | John Lambert# | 3.119 | 2022-2031 | |
| 10 | Lee Myers# | 3.122 | 2019-2031 | |
| 11 | Jake McGee | 3.133 | 2015-2023 | |
| 12 | Terrell Wade | 3.184 | 1995-2010 | |
| 13 | Gilberto Martínez# | 3.208 | 2025-2031 | |
| 14 | Santiago Herrera | 3.212 | 2000-2018 | |
| 15 | Rick Snow# | 3.235 | 2026-2031 | |
| 16 | Jesús Enríquez | 3.260 | 2001-2015 | |
| 17 | David Robertson | 3.265 | 2011-2023 | |
| 18 | Mike Harkey | 3.334 | 1988-2004 | |
| 19 | Nolan Arnold | 3.350 | 2011-2022 | |
| 20 | Toki Nagai | 3.351 | 2004-2015 | |
| 21 | Paul Hale# | 3.354 | 2020-2031 | |
| 22 | Ian Richardson | 3.355 | 2009-2019 | |
| 23 | Ronald Moyer# | 3.361 | 2023-2031 | |
| 24 | Dan Wilkerson# | 3.363 | 2023-2031 | |
| 25 | Zack Greinke* | 3.368 | 2005-2020 | |
| 26 | Dan Woods# | 3.369 | 2023-2031 | |
| 27 | Carlos Zambrano | 3.379 | 2001-2019 | |
| 28 | Kevin Schaefer | 3.391 | 2012-2023 | |
| 29 | José Torres# | 3.398 | 2026-2031 | |
| 30 | Dwight Tucker | 3.409 | 2011-2027 | |
| 31 | Madison Bumgarner | 3.418 | 2014-2031 | |
| 32 | Eddie Morgan* | 3.427 | 2005-2019 | |
| 33 | Mark Prior* | 3.439 | 2002-2016 | |
| 34 | David Nied* | 3.501 | 1992-2009 | |
| 35 | Kerry Wood | 3.509 | 1998-2007 | |
| 36 | Roy Oswalt* | 3.524 | 2001-2016 | |
| 37 | Juan Velázquez# | 3.526 | 2025-2031 | |
| 38 | Mo Sanford | 3.533 | 1991-2005 | |
| 39 | Juan Guzman* | 3.538 | 1991-2005 | |
| 40 | Dellin Betances | 3.540 | 2012-2028 | |
| 41 | Dave Dowden | 3.541 | 2017-2027 | |
| 42 | Andy Ashby | 3.552 | 1991-2002 | |
| 43 | Javier Vazquez* | 3.553 | 1998-2013 | |
| 44 | Jesús Bravo# | 3.561 | 2026-2031 | |
| 45 | Aaron Sele* | 3.572 | 1993-2006 | |
| 46 | Ramon J Martinez | 3.583 | 1988-2002 | |
| 47 | Garth Vaughn | 3.587 | 2008-2020 | |
| 48 | Jeff Sawyer | 3.602 | 2006-2018 | |
| 49 | Brandon Webb* | 3.608 | 2004-2024 | |
| 50 | Major Pixel | 3.609 | 2007-2021 | |
| 51 | Dorian Bunch# | 3.621 | 2022-2031 | |
| 52 | Scott Kazmir | 3.638 | 2004-2019 | |
| 53 | Daron Maddox | 3.658 | 2015-2027 | |
| 54 | Joba Chamberlain | 3.665 | 2012-2027 | |
| 54 | Gary Lefebvre | 3.665 | 2002-2016 | |
| 56 | Mike Hampton | 3.668 | 1994-2009 | |
| 57 | Roy Ward | 3.672 | 2014-2026 | |
| 58 | CC Sabathia* | 3.675 | 2001-2019 | |
| 59 | Rusty Meacham | 3.676 | 1991-2006 | |
| 60 | Randy D Johnson | 3.684 | 1988-2003 | |
| 60 | Dave Pownall | 3.684 | 2014-2027 | |
| 60 | Rheal Cormier | 3.684 | 1991-2005 | |
| 63 | Bill Gill# | 3.690 | 2023-2031 | |
| 64 | Roy Halladay* | 3.694 | 1998-2014 | |
| 65 | Brad Clontz | 3.699 | 1995-2009 | |
| 66 | Tony Martínez | 3.707 | 2002-2012 | |
| 67 | Ismael Valdez* | 3.709 | 1994-2010 | |
| 68 | Allen Bailey | 3.711 | 2011-2023 | |
| 68 | Pedro J Martinez | 3.711 | 1992-2007 | |
| 70 | Josh Johnson | 3.713 | 2010-2018 | |
| 71 | Carlos Jiménez# | 3.729 | 2021-2031 | |
| 72 | Chris Carpenter | 3.730 | 1997-2009 | |
| 73 | Cole Hamels* | 3.731 | 2007-2023 | |
| 74 | Stan Combs# | 3.735 | 2023-2031 | |
| 75 | Scott Sanders | 3.739 | 1993-2007 | |
| 76 | António Ortíz | 3.745 | 2002-2011 | |
| 77 | Scott Randall | 3.753 | 2003-2020 | |
| 78 | John Halama | 3.759 | 1998-2008 | |
| 79 | Jeff Shoemaker# | 3.764 | 2025-2031 | |
| 80 | Anthony Hunt | 3.765 | 2016-2028 | |
| 81 | Cisco Castellanos# | 3.766 | 2025-2031 | |
| 82 | Nathan Whalebelly | 3.769 | 2015-2029 | |
| 83 | Chad Qualls | 3.770 | 2006-2020 | |
| 84 | Brett Myers | 3.774 | 2002-2017 | |
| 84 | John Smoltz | 3.774 | 1988-2003 | |
| 86 | Paul Phelps | 3.777 | 2014-2026 | |
| 87 | Greg Keagle | 3.780 | 1996-2006 | |
| 88 | Kevin Walters | 3.787 | 2003-2015 | |
| 89 | Andy Pettitte | 3.797 | 1995-2004 | |
| 90 | Heath Bell | 3.800 | 2004-2021 | |
| 91 | Eric Hurley | 3.802 | 2007-2020 | |
| 92 | Angel Miranda | 3.810 | 1993-2006 | |
| 93 | Jimmy Anderson | 3.828 | 1999-2011 | |
| 94 | MacKenzie Gore# | 3.830 | 2026-2031 | |
| 94 | Esteban Loaiza | 3.830 | 1995-2006 | |
| 96 | Cory Lidle | 3.834 | 1997-2010 | |
| 97 | Erik Bedard | 3.846 | 2004-2013 | |
| 98 | Matt Morris | 3.847 | 1997-2005 | |
| 99 | Bob Clark | 3.858 | 2001-2015 | |
| 100 | Kelvim Escobar | 3.860 | 1997-2018 |
