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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | John Wood# | 0.000 | 2029 | |
| 1 | Heath Bell | 0.000 | 2009 | |
| 1 | Eddie Morgan* | 0.000 | 2018 | |
| 1 | Matt J Miller | 0.000 | 2005 | |
| 5 | Manny Aybar | 0.562 | 2005 | |
| 6 | Tommy Austin | 0.593 | 2017 | |
| 7 | Andrew Bailey | 0.600 | 2012 | |
| 8 | Adrian Ackermann | 0.750 | 2017 | |
| 9 | John Smoltz | 0.844 | 1989 | |
| 10 | Dan Wilkerson# | 0.900 | 2024 | |
| 11 | Carlos Cotter | 0.920 | 2018 | |
| 12 | Dan Woods# | 0.964 | 2024 | |
| 13 | Chad Billingsley | 0.982 | 2011 | |
| 14 | Steve Karsay | 1.091 | 1995 | |
| 15 | Roy Oswalt* | 1.125 | 2013 | |
| 15 | Gary Lefebvre | 1.125 | 2010 | |
| 15 | Leonardo Dávila# | 1.125 | 2025 | |
| 18 | Clifton Jackson# | 1.149 | 2025 | |
| 19 | Shelby Miller | 1.157 | 2022 | |
| 20 | Roy Oswalt* | 1.174 | 2005 | |
| 21 | Brandon Webb* | 1.200 | 2009 | |
| 22 | Eric Hurley | 1.209 | 2014 | |
| 23 | Jerry Patterson | 1.227 | 2008 | |
| 23 | Luis Anguiana# | 1.227 | 2030 | |
| 25 | Randy D Johnson | 1.246 | 1992 | |
| 25 | Tim Lincecum | 1.246 | 2015 | |
| 27 | Andy Ashby | 1.266 | 1996 | |
| 28 | Barry Zito | 1.286 | 2001 | |
| 29 | Jack Flaherty# | 1.306 | 2031 | |
| 30 | Kumar Rocker# | 1.350 | 2022 | |
| 30 | Eddie Morgan* | 1.350 | 2014 | |
| 32 | Jim Anderson# | 1.373 | 2022 | |
| 33 | Brent Strong | 1.385 | 2027 | |
| 34 | Carlos Jiménez# | 1.397 | 2026 | |
| 35 | Jerry Patterson | 1.406 | 2009 | |
| 36 | Kevin Walters | 1.421 | 2006 | |
| 36 | Major Pixel | 1.421 | 2019 | |
| 36 | Ronald Moyer# | 1.421 | 2031 | |
| 36 | Jason Ellis | 1.421 | 2025 | |
| 40 | Yeong-sin Park# | 1.473 | 2029 | |
| 41 | Lee Myers# | 1.484 | 2022 | |
| 42 | Allen Bailey | 1.500 | 2021 | |
| 43 | Roy Halladay* | 1.558 | 2007 | |
| 44 | Jake Peavy | 1.565 | 2010 | |
| 45 | Javier Vazquez* | 1.588 | 2003 | |
| 45 | Héctor Bernal# | 1.588 | 2024 | |
| 45 | Eduardo Vázquez# | 1.588 | 2025 | |
| 48 | Diego Madraso | 1.612 | 2006 | |
| 49 | Ismael Valdez* | 1.620 | 2002 | |
| 49 | Leo Erickson# | 1.620 | 2028 | |
| 49 | Eldon Hernández | 1.620 | 2022 | |
| 52 | Jason Ellis | 1.624 | 2020 | |
| 53 | Kenny Mayes | 1.636 | 2022 | |
| 53 | Diego Velázquez# | 1.636 | 2027 | |
| 55 | Bud Smith | 1.653 | 2004 | |
| 56 | Ian Richardson | 1.662 | 2011 | |
| 56 | Mark Prior* | 1.662 | 2003 | |
| 58 | Roger Clemens* | 1.667 | 1987 | |
| 59 | Roger Clemens* | 1.674 | 1998 | |
| 60 | Cisco Castellanos# | 1.688 | 2029 | |
| 60 | Aaron Sele* | 1.688 | 1998 | |
| 60 | Jimmy Anderson | 1.688 | 2006 | |
| 60 | Cole Hamels* | 1.688 | 2022 | |
| 64 | Bob Jenkins* | 1.718 | 2014 | |
| 65 | Henry Moss# | 1.723 | 2025 | |
| 66 | Dennis Redden# | 1.731 | 2031 | |
| 67 | Alfredo Huerta# | 1.742 | 2023 | |
| 68 | Lee Myers# | 1.748 | 2026 | |
| 69 | Freddy Garcia | 1.761 | 2003 | |
| 69 | Dirk Von Hayhurst | 1.761 | 2007 | |
| 69 | Ryan Harrison | 1.761 | 2003 | |
| 69 | Felix Hernandez | 1.761 | 2012 | |
| 73 | Jake McGee | 1.770 | 2017 | |
| 74 | Roger Clemens* | 1.780 | 1990 | |
| 75 | Randy D Johnson | 1.800 | 1991 | |
| 75 | Paul Hale# | 1.800 | 2027 | |
| 75 | Brandon Webb* | 1.800 | 2008 | |
| 75 | Archie Esparza# | 1.800 | 2025 | |
| 75 | Dwight Tucker | 1.800 | 2017 | |
| 80 | Eric Brennan# | 1.820 | 2020 | |
| 81 | Raúl Mateo# | 1.831 | 2030 | |
| 82 | Zack Greinke* | 1.841 | 2010 | |
| 83 | George Connolly# | 1.871 | 2024 | |
| 84 | José Torres# | 1.878 | 2030 | |
| 85 | Daron Maddox | 1.880 | 2017 | |
| 86 | R A Dickey | 1.906 | 2008 | |
| 87 | Ugueth Urbina | 1.929 | 2000 | |
| 87 | Luis Anguiana# | 1.929 | 2027 | |
| 87 | Javier Vazquez* | 1.929 | 2005 | |
| 87 | Jason Dickson | 1.929 | 2001 | |
| 91 | Benny Howard# | 1.957 | 2023 | |
| 91 | Shelby Miller | 1.957 | 2024 | |
| 91 | Kevin Walters | 1.957 | 2009 | |
| 94 | Allen Bailey | 1.964 | 2017 | |
| 95 | Jeff Samardzija | 1.976 | 2017 | |
| 96 | Bob Lafontaine | 1.985 | 2007 | |
| 97 | Roy Ward | 2.000 | 2022 | |
| 97 | Tony Martínez | 2.000 | 2010 | |
| 99 | Roger Clemens* | 2.011 | 1994 | |
| 100 | Alfredo Gómez# | 2.015 | 2029 |
