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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Sandy Koufax | 1.728 | 1966 | |
| 2 | Sandy Koufax | 1.735 | 1964 | |
| 3 | Sandy Koufax | 1.881 | 1963 | |
| 4 | Paul Maholm | 1.995 | 2006 | |
| 5 | Sandy Koufax | 2.038 | 1965 | |
| 6 | Catfish Hunter | 2.042 | 1972 | |
| 7 | Shane Bieber# | 2.130 | 2022 | |
| 8 | Zack Wheeler# | 2.173 | 2015 | |
| 8 | Mat Latos | 2.173 | 2015 | |
| 10 | Felix Hernandez | 2.187 | 2012 | |
| 11 | Matt Harvey | 2.199 | 2015 | |
| 12 | Charlie Shirek | 2.216 | 2011 | |
| 13 | Danny Salazar | 2.236 | 2017 | |
| 14 | Jacob Johnson | 2.250 | 2011 | |
| 15 | Tarik Skubal# | 2.266 | 2026 | |
| 16 | Stephen Strasburg | 2.280 | 2014 | |
| 17 | Smith Smith | 2.293 | 2013 | |
| 18 | Johnny Antonelli | 2.296 | 1954 | |
| 19 | Larry Dierker | 2.329 | 1969 | |
| 20 | Yu Darvish# | 2.350 | 2013 | |
| 21 | Luke Hochevar | 2.368 | 2014 | |
| 22 | Stephen Strasburg | 2.382 | 2013 | |
| 23 | John Lackey | 2.391 | 2008 | |
| 24 | Felix Hernandez | 2.406 | 2013 | |
| 25 | Cole Ragans# | 2.420 | 2026 | |
| 26 | Lucas Giolito# | 2.431 | 2020 | |
| 26 | Aaron Harang | 2.431 | 2008 | |
| 28 | Felix Hernandez | 2.462 | 2015 | |
| 29 | Anthony Bass | 2.475 | 2011 | |
| 30 | Zack Wheeler# | 2.480 | 2022 | |
| 31 | Stephen Strasburg | 2.487 | 2012 | |
| 32 | Catfish Hunter | 2.488 | 1974 | |
| 33 | Yu Darvish# | 2.511 | 2014 | |
| 34 | Clayton Kershaw# | 2.521 | 2015 | |
| 35 | Smith Smith | 2.523 | 2006 | |
| 36 | Bartolo Colon | 2.530 | 2001 | |
| 37 | David Price | 2.531 | 2015 | |
| 38 | Johnny Cueto | 2.535 | 2012 | |
| 39 | Sandy Koufax | 2.539 | 1962 | |
| 40 | Justin Verlander# | 2.553 | 2022 | |
| 41 | Jake Peavy | 2.560 | 2007 | |
| 42 | Cole Hamels | 2.564 | 2007 | |
| 43 | Catfish Hunter | 2.579 | 1975 | |
| 44 | David Price | 2.602 | 2016 | |
| 45 | Trevor Bauer | 2.611 | 2017 | |
| 46 | Chris Archer | 2.625 | 2016 | |
| 46 | Yu Darvish# | 2.625 | 2015 | |
| 48 | Freddy Peralta# | 2.628 | 2024 | |
| 49 | Lance McCullers Jr.# | 2.633 | 2021 | |
| 50 | Phil Hughes | 2.644 | 2012 | |
| 51 | Freddy Peralta# | 2.645 | 2021 | |
| 52 | Shane McClanahan# | 2.655 | 2023 | |
| 53 | Adam Wainwright | 2.669 | 2013 | |
| 54 | Bill Stafford | 2.677 | 1961 | |
| 55 | Bob Feller | 2.679 | 1947 | |
| 56 | Tim Lincecum | 2.688 | 2013 | |
| 57 | Matt Belisle | 2.689 | 2008 | |
| 58 | Wade Miley# | 2.695 | 2010 | |
| 59 | Jeff Samardzija | 2.696 | 2016 | |
| 59 | Adam Wainwright | 2.696 | 2012 | |
| 61 | Nathan Eovaldi# | 2.700 | 2017 | |
| 61 | Jake Arrieta | 2.700 | 2016 | |
| 61 | Felix Hernandez | 2.700 | 2014 | |
| 64 | Wade Davis | 2.716 | 2013 | |
| 65 | Eric Berger | 2.726 | 2010 | |
| 66 | Clayton Kershaw# | 2.734 | 2013 | |
| 67 | Tim Melville | 2.738 | 2011 | |
| 68 | Adam Wainwright | 2.744 | 2011 | |
| 69 | Luis Severino# | 2.748 | 2023 | |
| 70 | Jered Weaver | 2.750 | 2012 | |
| 71 | Justin Verlander# | 2.759 | 2020 | |
| 72 | Robbie Ross Jr. | 2.772 | 2010 | |
| 73 | Greg Smith | 2.780 | 2010 | |
| 74 | Josh M. Johnson | 2.789 | 2008 | |
| 75 | Sean Manaea# | 2.793 | 2022 | |
| 76 | Kyle McPherson | 2.795 | 2011 | |
| 77 | Sonny Gray# | 2.796 | 2022 | |
| 78 | CC Sabathia | 2.799 | 2009 | |
| 79 | Max Scherzer# | 2.801 | 2017 | |
| 80 | Johnnie Lowe | 2.804 | 2011 | |
| 81 | Scott Baker | 2.807 | 2013 | |
| 81 | Catfish Hunter | 2.807 | 1967 | |
| 83 | Clayton Kershaw# | 2.809 | 2017 | |
| 84 | John Lamb | 2.815 | 2011 | |
| 84 | Blake Snell# | 2.815 | 2019 | |
| 86 | CC Sabathia | 2.817 | 2014 | |
| 87 | Stephen Strasburg | 2.825 | 2016 | |
| 88 | Wade Miley# | 2.826 | 2015 | |
| 89 | Smith Smith | 2.828 | 2013 | |
| 90 | Franklin Morales | 2.831 | 2010 | |
| 91 | Mike Foltynewicz | 2.833 | 2019 | |
| 92 | Justin Verlander# | 2.837 | 2021 | |
| 93 | Max Scherzer# | 2.838 | 2014 | |
| 94 | Chris Sale# | 2.839 | 2014 | |
| 95 | Lucas Giolito# | 2.847 | 2021 | |
| 96 | Johnny Antonelli | 2.857 | 1956 | |
| 97 | Cole Hamels | 2.869 | 2015 | |
| 98 | Yu Darvish# | 2.875 | 2016 | |
| 99 | Scott Feldman | 2.883 | 2017 | |
| 100 | Max Scherzer# | 2.889 | 2015 |
