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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Edwin Diaz# | 2.716 | 2017-2025 | |
| 2 | Sandy Koufax | 2.761 | 1955-1966 | |
| 3 | Kenley Jansen# | 2.905 | 2012-2025 | |
| 4 | David Robertson# | 2.947 | 2010-2025 | |
| 5 | Ryan Pressly# | 2.987 | 2016-2025 | |
| 6 | Joe Nathan | 3.051 | 2000-2016 | |
| 7 | Steve Hamilton | 3.054 | 1961-1972 | |
| 8 | Craig Kimbrel# | 3.074 | 2011-2025 | |
| 9 | Huston Street | 3.084 | 2005-2016 | |
| 10 | Catfish Hunter | 3.106 | 1965-1976 | |
| 11 | Luke Gregerson | 3.146 | 2010-2019 | |
| 12 | Casey Janssen | 3.170 | 2007-2016 | |
| 13 | Shane McClanahan# | 3.184 | 2023-2025 | |
| 14 | Francisco Rodriguez | 3.197 | 2003-2018 | |
| 15 | Max Scherzer# | 3.259 | 2009-2025 | |
| 16 | Jonathan Broxton | 3.268 | 2007-2017 | |
| 17 | Larry Dierker | 3.283 | 1964-1976 | |
| 18 | Billy O'Dell | 3.294 | 1954-1967 | |
| 19 | Joakim Soria | 3.301 | 2007-2020 | |
| 20 | Chaz Roe | 3.305 | 2010-2021 | |
| 21 | Johnny Antonelli | 3.338 | 1948-1961 | |
| 22 | Jonathan Papelbon | 3.352 | 2006-2017 | |
| 23 | Sean Doolittle | 3.366 | 2011-2022 | |
| 24 | Aroldis Chapman# | 3.390 | 2011-2025 | |
| 25 | Jesse Crain | 3.392 | 2006-2015 | |
| 26 | David Price | 3.418 | 2009-2023 | |
| 27 | Matt Belisle | 3.449 | 2004-2018 | |
| 28 | Bryse Wilson# | 3.451 | 2020-2025 | |
| 29 | Smith Smith | 3.471 | 2002-2018 | |
| 30 | Tony Watson | 3.479 | 2011-2021 | |
| 30 | Mark Melancon | 3.479 | 2010-2023 | |
| 32 | Blake Snell# | 3.488 | 2012-2025 | |
| 33 | Yu Darvish# | 3.490 | 2012-2025 | |
| 34 | Adam Ottavino# | 3.492 | 2010-2024 | |
| 35 | Raisel Iglesias# | 3.502 | 2016-2025 | |
| 36 | Brad Ziegler | 3.516 | 2007-2018 | |
| 37 | Bill Stafford | 3.517 | 1960-1967 | |
| 38 | Jose Alvarez | 3.532 | 2010-2023 | |
| 39 | Mat Latos | 3.542 | 2010-2016 | |
| 40 | Bob Feller | 3.544 | 1947-1956 | |
| 41 | Shane Bieber# | 3.546 | 2020-2025 | |
| 42 | Sergio Romo | 3.547 | 2010-2021 | |
| 43 | Lance McCullers Jr.# | 3.551 | 2016-2025 | |
| 44 | Wade Davis | 3.567 | 2009-2020 | |
| 45 | Justin Verlander# | 3.576 | 2007-2025 | |
| 46 | Rafael Soriano | 3.585 | 2003-2015 | |
| 47 | Jeurys Familia | 3.590 | 2010-2022 | |
| 48 | Luis Severino# | 3.603 | 2016-2025 | |
| 49 | Stephen Strasburg# | 3.607 | 2010-2025 | |
| 50 | Jacob Degrom# | 3.610 | 2012-2025 | |
| 51 | Hector Rondon | 3.611 | 2010-2021 | |
| 52 | Joe Smith | 3.619 | 2008-2022 | |
| 53 | Clayton Kershaw# | 3.637 | 2009-2025 | |
| 54 | Pablo Lopez# | 3.644 | 2021-2025 | |
| 55 | Andrew Miller | 3.648 | 2007-2020 | |
| 56 | Josh M. Johnson | 3.654 | 2006-2017 | |
| 57 | Evan Scribner | 3.661 | 2011-2018 | |
| 58 | Liam Hendriks# | 3.666 | 2012-2025 | |
| 59 | Freddy Peralta# | 3.667 | 2019-2025 | |
| 60 | Koji Uehara | 3.675 | 2009-2018 | |
| 61 | Chris Sale# | 3.683 | 2011-2025 | |
| 62 | Santiago Casilla | 3.698 | 2005-2017 | |
| 62 | Triston McKenzie# | 3.698 | 2021-2025 | |
| 64 | Jason Grilli | 3.703 | 2001-2017 | |
| 65 | Trevor Bauer | 3.713 | 2012-2023 | |
| 66 | Felix Hernandez | 3.717 | 2005-2021 | |
| 67 | Luis Castillo# | 3.732 | 2020-2025 | |
| 68 | Tarik Skubal# | 3.740 | 2022-2025 | |
| 69 | Jake Peavy | 3.741 | 2002-2018 | |
| 70 | Sean Marshall | 3.745 | 2007-2016 | |
| 71 | Danny Salazar | 3.747 | 2010-2021 | |
| 72 | Justin Steele# | 3.748 | 2015-2025 | |
| 73 | Luke Hochevar | 3.756 | 2010-2018 | |
| 74 | Cole Hamels | 3.773 | 2007-2022 | |
| 75 | Zach McAllister | 3.776 | 2012-2019 | |
| 75 | Walker Buehler# | 3.776 | 2019-2025 | |
| 77 | Max Fried# | 3.779 | 2018-2025 | |
| 78 | Lucas Giolito# | 3.780 | 2016-2025 | |
| 79 | Darren O'Day | 3.782 | 2010-2022 | |
| 80 | Marcus Stroman# | 3.788 | 2015-2025 | |
| 81 | Brandon Maurer | 3.790 | 2010-2018 | |
| 82 | Framber Valdez# | 3.801 | 2022-2025 | |
| 83 | Collin McHugh | 3.803 | 2010-2024 | |
| 84 | Dylan Cease# | 3.804 | 2015-2025 | |
| 85 | Adam Wainwright | 3.809 | 2004-2023 | |
| 86 | Adam Warren | 3.817 | 2010-2021 | |
| 87 | Johnny Cueto | 3.828 | 2010-2023 | |
| 87 | A.J. Griffin | 3.828 | 2014-2017 | |
| 89 | Steve Cishek | 3.834 | 2012-2021 | |
| 90 | Seth Lugo# | 3.839 | 2012-2025 | |
| 91 | Aaron Nola# | 3.843 | 2015-2025 | |
| 92 | Scott Baker | 3.855 | 2006-2014 | |
| 93 | Chad Billingsley | 3.866 | 2007-2015 | |
| 94 | Joel Peralta | 3.877 | 2005-2016 | |
| 95 | Smith Smith | 3.896 | 2005-2015 | |
| 96 | Jerry Blevins | 3.904 | 2008-2018 | |
| 97 | Julio Urias# | 3.922 | 2018-2025 | |
| 98 | Kris Medlen | 3.923 | 2010-2016 | |
| 98 | Hunter Strickland# | 3.923 | 2010-2023 | |
| 100 | Jesse Chavez# | 3.930 | 2010-2025 |
