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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Sandy Koufax | 0.947 | 1955-1966 | |
| 2 | Mat Latos | 1.364 | 2010-2016 | |
| 3 | Justin Souza | 1.406 | 2012-2012 | |
| 4 | Jacob Degrom# | 1.716 | 2012-2025 | |
| 5 | Chris Jones | 1.800 | 2010-2012 | |
| 6 | Jeurys Familia | 1.813 | 2010-2022 | |
| 7 | Kyle Hendricks# | 1.929 | 2016-2024 | |
| 8 | Jon Niese | 2.054 | 2009-2016 | |
| 9 | Merrill Kelly# | 2.182 | 2019-2024 | |
| 10 | Carlos Carrasco | 2.261 | 2010-2023 | |
| 11 | Gerrit Cole# | 2.353 | 2012-2025 | |
| 12 | Stephen Strasburg# | 2.455 | 2010-2025 | |
| 13 | Lance McCullers Jr.# | 2.478 | 2016-2025 | |
| 14 | Max Scherzer# | 2.669 | 2009-2025 | |
| 15 | Homer Bailey | 2.700 | 2009-2020 | |
| 16 | Jose Quintana# | 2.742 | 2013-2025 | |
| 17 | Michael Pineda | 2.755 | 2011-2023 | |
| 18 | Catfish Hunter | 2.807 | 1965-1976 | |
| 19 | Yu Darvish# | 2.816 | 2012-2025 | |
| 20 | Gio Gonzalez | 3.057 | 2010-2022 | |
| 21 | Nathan Eovaldi# | 3.134 | 2012-2025 | |
| 22 | Shane McClanahan# | 3.176 | 2023-2025 | |
| 23 | Craig Kimbrel# | 3.250 | 2011-2025 | |
| 24 | Smith Smith | 3.280 | 2004-2017 | |
| 25 | Corbin Burnes# | 3.303 | 2020-2025 | |
| 26 | Corey Kluber | 3.333 | 2011-2023 | |
| 27 | Justin Verlander# | 3.385 | 2007-2025 | |
| 28 | Johnny Cueto | 3.490 | 2010-2023 | |
| 29 | Madison Bumgarner | 3.533 | 2011-2023 | |
| 30 | Blake Snell# | 3.638 | 2012-2025 | |
| 31 | Charlie Morton# | 3.706 | 2010-2025 | |
| 32 | Shohei Ohtani# | 3.774 | 2018-2025 | |
| 33 | Tyler Mahle# | 3.787 | 2017-2025 | |
| 34 | Chad Bettis | 3.793 | 2012-2019 | |
| 35 | Walker Buehler# | 3.814 | 2019-2025 | |
| 36 | Wade Davis | 3.832 | 2009-2020 | |
| 37 | Aaron Nola# | 3.906 | 2015-2025 | |
| 38 | Hyun-Jin Ryu | 4.000 | 2013-2023 | |
| 39 | Jake Odorizzi | 4.091 | 2012-2023 | |
| 40 | Adam Wainwright | 4.175 | 2004-2023 | |
| 41 | Dellin Betances | 4.290 | 2011-2021 | |
| 42 | Edinson Volquez | 4.320 | 2008-2020 | |
| 43 | David Price | 4.455 | 2009-2023 | |
| 44 | Cole Hamels | 4.547 | 2007-2022 | |
| 45 | Clayton Kershaw# | 4.591 | 2009-2025 | |
| 46 | Derek Holland | 4.673 | 2010-2019 | |
| 47 | Zack Wheeler# | 4.690 | 2010-2025 | |
| 48 | Trevor Bauer | 4.696 | 2012-2023 | |
| 49 | Carlos Rodon# | 4.717 | 2015-2025 | |
| 50 | Jaime Garcia | 4.732 | 2011-2017 | |
| 51 | Ross Detwiler | 4.747 | 2011-2023 | |
| 52 | Matt Moore# | 4.832 | 2012-2025 | |
| 53 | Marcus Stroman# | 4.869 | 2015-2024 | |
| 54 | German Marquez# | 4.875 | 2018-2025 | |
| 55 | Chris Archer | 5.018 | 2012-2023 | |
| 56 | Pablo Lopez# | 5.019 | 2021-2025 | |
| 57 | Freddy Peralta# | 5.130 | 2019-2025 | |
| 58 | Ryan Pressley | 5.235 | 2010-2012 | |
| 59 | Logan Webb# | 5.637 | 2015-2025 | |
| 60 | Dylan Cease# | 5.745 | 2015-2025 | |
| 61 | Matthew Boyd# | 5.870 | 2019-2025 | |
| 62 | Miles Mikolas# | 5.923 | 2010-2025 | |
| 63 | Julio Urias# | 6.824 | 2018-2023 |
