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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Joe Sparks | 1.533 | 2015 | |
| 2 | Carlos Zambrano | 1.558 | 2008 | |
| 3 | Bob Jenkins* | 1.613 | 2012 | |
| 4 | Roger Clemens* | 1.776 | 1990 | |
| 4 | Archie Esparza# | 1.776 | 2027 | |
| 6 | Dwight Tucker | 1.815 | 2015 | |
| 7 | Madison Bumgarner | 1.867 | 2026 | |
| 8 | Roger Clemens* | 1.926 | 2000 | |
| 9 | Gilberto Martínez# | 1.939 | 2029 | |
| 10 | Roger Clemens* | 1.960 | 1991 | |
| 11 | Eddie Morgan* | 2.021 | 2009 | |
| 12 | John Fletcher# | 2.036 | 2026 | |
| 13 | Aaron Sele* | 2.046 | 2000 | |
| 14 | CC Sabathia* | 2.083 | 2006 | |
| 14 | Mark Prior* | 2.083 | 2004 | |
| 16 | Gregory Burke | 2.091 | 2007 | |
| 16 | Carl Pavano | 2.091 | 2008 | |
| 18 | Dwight Tucker | 2.093 | 2017 | |
| 19 | Daron Maddox | 2.103 | 2019 | |
| 20 | Joe Sparks | 2.106 | 2009 | |
| 21 | Roger Clemens* | 2.119 | 1994 | |
| 22 | John Lambert# | 2.141 | 2025 | |
| 23 | Gary Lefebvre | 2.148 | 2011 | |
| 24 | Roger Clemens* | 2.171 | 1987 | |
| 25 | Mark Prior* | 2.178 | 2003 | |
| 26 | Kevin Schaefer | 2.184 | 2015 | |
| 27 | Roger Clemens* | 2.219 | 1996 | |
| 28 | Gregory Burke | 2.246 | 2006 | |
| 29 | Roger Clemens* | 2.263 | 1992 | |
| 30 | Roger Clemens* | 2.269 | 1993 | |
| 31 | Bob Jenkins* | 2.281 | 2011 | |
| 32 | William Pierce# | 2.303 | 2027 | |
| 33 | Andrew Bailey | 2.304 | 2014 | |
| 34 | Mitch Craft# | 2.317 | 2029 | |
| 35 | Roger Clemens* | 2.318 | 1986 | |
| 36 | Daniel Patterson | 2.327 | 2022 | |
| 36 | Irving Townsend# | 2.327 | 2028 | |
| 38 | Lee Myers# | 2.343 | 2027 | |
| 39 | Reece MacKinley | 2.345 | 2012 | |
| 40 | Roger Clemens* | 2.346 | 1988 | |
| 41 | Gil Meche | 2.352 | 2001 | |
| 42 | Paul Phelps | 2.366 | 2016 | |
| 43 | Mike Hampton | 2.390 | 2003 | |
| 44 | Scott Sanders | 2.399 | 1996 | |
| 45 | Joba Chamberlain | 2.408 | 2013 | |
| 46 | Rich Burton | 2.412 | 2021 | |
| 47 | António Ortíz | 2.415 | 2005 | |
| 48 | Toki Nagai | 2.423 | 2007 | |
| 49 | Lee Myers# | 2.432 | 2024 | |
| 50 | Javier Vazquez* | 2.434 | 2002 | |
| 51 | Hipolito Pichardo | 2.438 | 1994 | |
| 51 | Dorian Bunch# | 2.438 | 2023 | |
| 53 | Raúl López | 2.440 | 2003 | |
| 54 | Kerry Wood | 2.447 | 1999 | |
| 55 | Bob Jenkins* | 2.458 | 2020 | |
| 56 | Juan Guzman* | 2.461 | 1991 | |
| 57 | Ben Sheets | 2.476 | 2002 | |
| 57 | Rick Snow# | 2.476 | 2028 | |
| 59 | Roy Halladay* | 2.483 | 2007 | |
| 60 | Archie Esparza# | 2.488 | 2026 | |
| 61 | Daron Maddox | 2.491 | 2015 | |
| 62 | Nolan Arnold | 2.496 | 2014 | |
| 63 | Carlos Zambrano | 2.506 | 2011 | |
| 64 | Archie Esparza# | 2.513 | 2028 | |
| 65 | Mark Prior* | 2.523 | 2007 | |
| 66 | Yeong-sin Park# | 2.524 | 2029 | |
| 67 | Amdre Nova# | 2.526 | 2030 | |
| 68 | Archie Esparza# | 2.539 | 2029 | |
| 69 | A J Burnett | 2.541 | 2002 | |
| 70 | Scott Kazmir | 2.547 | 2009 | |
| 71 | Clarence Holland | 2.550 | 2015 | |
| 72 | Brandon Webb* | 2.551 | 2016 | |
| 73 | R A Dickey | 2.554 | 2008 | |
| 74 | Major Pixel | 2.555 | 2010 | |
| 74 | Joel Pineiro | 2.555 | 2003 | |
| 76 | Nolan Arnold | 2.577 | 2013 | |
| 77 | Steve Nebraska | 2.585 | 2015 | |
| 78 | Brandon Webb* | 2.590 | 2011 | |
| 79 | Juan Guzman* | 2.595 | 1993 | |
| 80 | Joe Sparks | 2.600 | 2013 | |
| 81 | Joe Sparks | 2.602 | 2012 | |
| 82 | Roy Ward | 2.613 | 2015 | |
| 83 | Randy D Johnson | 2.620 | 1998 | |
| 84 | Steve Karsay | 2.628 | 1993 | |
| 85 | Heath Bell | 2.630 | 2010 | |
| 85 | Zack Greinke* | 2.630 | 2008 | |
| 87 | Manny Aybar | 2.644 | 2002 | |
| 88 | Randy D Johnson | 2.645 | 1990 | |
| 89 | Lee Myers# | 2.647 | 2021 | |
| 90 | Roy Oswalt* | 2.649 | 2011 | |
| 91 | Gregory Burke | 2.653 | 2008 | |
| 92 | Reece MacKinley | 2.659 | 2009 | |
| 92 | Madison Bumgarner | 2.659 | 2025 | |
| 94 | Tony Martínez | 2.661 | 2007 | |
| 95 | Gilberto Martínez# | 2.671 | 2027 | |
| 96 | Dan Haren | 2.672 | 2010 | |
| 97 | Nolan Arnold | 2.679 | 2018 | |
| 98 | Dave Dowden | 2.685 | 2023 | |
| 99 | Bob Jenkins* | 2.686 | 2013 | |
| 100 | Gary Lefebvre | 2.687 | 2008 |
