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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Sandy Koufax | 2.761 | 1955-1966 | |
| 2 | Kenley Jansen# | 2.905 | 2012-2025 | |
| 3 | David Robertson# | 2.947 | 2010-2025 | |
| 4 | Joe Nathan | 3.051 | 2000-2016 | |
| 5 | Steve Hamilton | 3.054 | 1961-1972 | |
| 6 | Craig Kimbrel# | 3.074 | 2011-2025 | |
| 7 | Huston Street | 3.084 | 2005-2016 | |
| 8 | Catfish Hunter | 3.106 | 1965-1976 | |
| 9 | Luke Gregerson | 3.146 | 2010-2019 | |
| 10 | Francisco Rodriguez | 3.197 | 2003-2018 | |
| 11 | Max Scherzer# | 3.259 | 2009-2025 | |
| 12 | Jonathan Broxton | 3.268 | 2007-2017 | |
| 13 | Larry Dierker | 3.283 | 1964-1976 | |
| 14 | Billy O'Dell | 3.294 | 1954-1967 | |
| 15 | Joakim Soria | 3.301 | 2007-2020 | |
| 16 | Chaz Roe | 3.305 | 2010-2021 | |
| 17 | Johnny Antonelli | 3.338 | 1948-1961 | |
| 18 | Jonathan Papelbon | 3.352 | 2006-2017 | |
| 19 | Sean Doolittle | 3.366 | 2011-2022 | |
| 20 | Aroldis Chapman# | 3.390 | 2011-2025 | |
| 21 | Jesse Crain | 3.392 | 2006-2015 | |
| 22 | David Price | 3.418 | 2009-2023 | |
| 23 | Matt Belisle | 3.449 | 2004-2018 | |
| 24 | Bryse Wilson# | 3.451 | 2020-2025 | |
| 25 | Smith Smith | 3.471 | 2002-2018 | |
| 26 | Mark Melancon | 3.479 | 2010-2023 | |
| 27 | Blake Snell# | 3.488 | 2012-2025 | |
| 28 | Yu Darvish# | 3.490 | 2012-2025 | |
| 29 | Adam Ottavino# | 3.492 | 2010-2024 | |
| 30 | Raisel Iglesias# | 3.502 | 2016-2025 | |
| 31 | Brad Ziegler | 3.516 | 2007-2018 | |
| 32 | Bill Stafford | 3.517 | 1960-1967 | |
| 33 | Jose Alvarez | 3.532 | 2010-2023 | |
| 34 | Mat Latos | 3.542 | 2010-2016 | |
| 35 | Bob Feller | 3.544 | 1947-1956 | |
| 36 | Shane Bieber# | 3.546 | 2020-2025 | |
| 37 | Sergio Romo | 3.547 | 2010-2021 | |
| 38 | Lance McCullers Jr.# | 3.551 | 2016-2025 | |
| 39 | Wade Davis | 3.567 | 2009-2020 | |
| 40 | Justin Verlander# | 3.576 | 2007-2025 | |
| 41 | Rafael Soriano | 3.585 | 2003-2015 | |
| 42 | Jeurys Familia | 3.590 | 2010-2022 | |
| 43 | Luis Severino# | 3.603 | 2016-2025 | |
| 44 | Stephen Strasburg# | 3.607 | 2010-2025 | |
| 45 | Jacob Degrom# | 3.610 | 2012-2025 | |
| 46 | Hector Rondon | 3.611 | 2010-2021 | |
| 47 | Joe Smith | 3.619 | 2008-2022 | |
| 48 | Clayton Kershaw# | 3.637 | 2009-2025 | |
| 49 | Pablo Lopez# | 3.644 | 2021-2025 | |
| 50 | Andrew Miller | 3.648 | 2007-2020 | |
| 51 | Josh M. Johnson | 3.654 | 2006-2017 | |
| 52 | Liam Hendriks# | 3.666 | 2012-2025 | |
| 53 | Freddy Peralta# | 3.667 | 2019-2025 | |
| 54 | Koji Uehara | 3.675 | 2009-2018 | |
| 55 | Chris Sale# | 3.683 | 2011-2025 | |
| 56 | Santiago Casilla | 3.698 | 2005-2017 | |
| 57 | Trevor Bauer | 3.713 | 2012-2023 | |
| 58 | Felix Hernandez | 3.717 | 2005-2021 | |
| 59 | Luis Castillo# | 3.732 | 2020-2025 | |
| 60 | Tarik Skubal# | 3.740 | 2022-2025 | |
| 61 | Jake Peavy | 3.741 | 2002-2018 | |
| 62 | Sean Marshall | 3.745 | 2007-2016 | |
| 63 | Danny Salazar | 3.747 | 2010-2021 | |
| 64 | Justin Steele# | 3.748 | 2015-2025 | |
| 65 | Luke Hochevar | 3.756 | 2010-2018 | |
| 66 | Cole Hamels | 3.773 | 2007-2022 | |
| 67 | Zach McAllister | 3.776 | 2012-2019 | |
| 67 | Walker Buehler# | 3.776 | 2019-2025 | |
| 69 | Max Fried# | 3.779 | 2018-2025 | |
| 70 | Lucas Giolito# | 3.780 | 2016-2025 | |
| 71 | Darren O'Day | 3.782 | 2010-2022 | |
| 72 | Marcus Stroman# | 3.788 | 2015-2025 | |
| 73 | Brandon Maurer | 3.790 | 2010-2018 | |
| 74 | Framber Valdez# | 3.801 | 2022-2025 | |
| 75 | Collin McHugh | 3.803 | 2010-2024 | |
| 76 | Dylan Cease# | 3.804 | 2015-2025 | |
| 77 | Adam Wainwright | 3.809 | 2004-2023 | |
| 78 | Adam Warren | 3.817 | 2010-2021 | |
| 79 | Johnny Cueto | 3.828 | 2010-2023 | |
| 80 | Steve Cishek | 3.834 | 2012-2021 | |
| 81 | Seth Lugo# | 3.839 | 2012-2025 | |
| 82 | Aaron Nola# | 3.843 | 2015-2025 | |
| 83 | Scott Baker | 3.855 | 2006-2014 | |
| 84 | Chad Billingsley | 3.866 | 2007-2015 | |
| 85 | Smith Smith | 3.896 | 2005-2015 | |
| 86 | Jerry Blevins | 3.904 | 2008-2018 | |
| 87 | Julio Urias# | 3.922 | 2018-2025 | |
| 88 | Kris Medlen | 3.923 | 2010-2016 | |
| 88 | Hunter Strickland# | 3.923 | 2010-2023 | |
| 90 | Jesse Chavez# | 3.930 | 2010-2025 | |
| 91 | Corbin Burnes# | 3.931 | 2020-2025 | |
| 91 | Zack Wheeler# | 3.931 | 2010-2025 | |
| 93 | Matt Harvey | 3.934 | 2014-2021 | |
| 94 | Wade Miley# | 3.937 | 2010-2024 | |
| 95 | Alex Colome | 3.939 | 2010-2022 | |
| 96 | J.P. Howell | 3.944 | 2008-2017 | |
| 97 | Tim Lincecum | 3.956 | 2009-2018 | |
| 98 | Carlos Rodon# | 3.961 | 2015-2025 | |
| 99 | Sonny Gray# | 3.963 | 2012-2025 | |
| 100 | Jeff Samardzija | 3.967 | 2010-2020 |
