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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Juan Montano# | 0.926 | 2032 | |
| 2 | Chad Sosnowski# | 1.292 | 2027 | |
| 3 | Rick Ankiel | 1.335 | 2001 | |
| 4 | Chris Masters | 1.421 | 2009 | |
| 5 | Edwin Diaz | 1.435 | 2013 | |
| 6 | Mike Damm# | 1.466 | 2028 | |
| 7 | Dennis Bennett | 1.519 | 1958 | |
| 8 | Jeremy Hall | 1.558 | 2007 | |
| 9 | Sam Lawrence | 1.633 | 2029 | |
| 10 | Josh Bailey | 1.723 | 2028 | |
| 11 | Anthony Lerew | 1.735 | 2002 | |
| 12 | Steve Marcelletti# | 1.791 | 2036 | |
| 13 | Rob Whalen | 1.866 | 2013 | |
| 14 | Enny Romero | 1.947 | 2010 | |
| 15 | Grant Gambrell | 1.966 | 2020 | |
| 16 | Luis Rijo | 2.048 | 2018 | |
| 17 | D.J. Darden | 2.077 | 2028 | |
| 18 | Jake Stoskopf# | 2.087 | 2035 | |
| 18 | Chris Flexen | 2.087 | 2013 | |
| 20 | Bill Bell | 2.089 | 1952 | |
| 21 | Randy Vasquez | 2.104 | 2021 | |
| 22 | Steve DiMora | 2.169 | 2025 | |
| 23 | Mike Bacsik | 2.196 | 1996 | |
| 24 | Dave Cousins# | 2.219 | 2034 | |
| 25 | Aaron Harang | 2.298 | 1999 | |
| 26 | Winston Abreu | 2.311 | 1995 | |
| 27 | Guillermo Villasmil | 2.318 | 2024 | |
| 28 | JJ Goss# | 2.338 | 2023 | |
| 29 | Chris LeBouef# | 2.362 | 2028 | |
| 30 | Randy Beach# | 2.389 | 2033 | |
| 31 | Montana Semmel | 2.455 | 2022 | |
| 32 | Matt Heidenreich | 2.487 | 2010 | |
| 32 | Spencer Arroyo | 2.487 | 2010 | |
| 34 | Phil Dennis# | 2.488 | 2032 | |
| 35 | D.J. Houlton | 2.500 | 2001 | |
| 36 | Willian Avinazar | 2.625 | 2010 | |
| 37 | Greg Maddux* | 2.626 | 1984 | |
| 38 | Avery Byrd# | 2.634 | 2035 | |
| 39 | William Gonzalez | 2.647 | 2023 | |
| 40 | Gregory Infante | 2.664 | 2008 | |
| 41 | Erik Brandenburg# | 2.675 | 2031 | |
| 42 | Marcelo Martinez | 2.684 | 2018 | |
| 43 | Bob Lewis# | 2.700 | 2032 | |
| 44 | Ted Mechling | 2.757 | 2025 | |
| 45 | Crawford Simmons | 2.769 | 2010 | |
| 46 | Leonel Santiago | 2.778 | 2010 | |
| 47 | Bobby Lanigan | 2.785 | 2008 | |
| 48 | Joe Pope | 2.827 | 2024 | |
| 49 | Chris Hollingsworth# | 2.829 | 2034 | |
| 50 | Eddie Rinker | 2.842 | 2023 | |
| 50 | Orlando Cosby | 2.842 | 2024 | |
| 52 | JJ Goss# | 2.862 | 2022 | |
| 52 | Rick Bauer | 2.862 | 1997 | |
| 54 | Dilmer Mejia | 2.870 | 2018 | |
| 54 | Dan Wasson | 2.870 | 2028 | |
| 56 | Olivier Basabe | 2.898 | 2006 | |
| 57 | Danny Ogg | 2.906 | 2027 | |
| 58 | Manny Paramo# | 2.929 | 2027 | |
| 58 | Elijah Coney# | 2.929 | 2032 | |
| 60 | Willy Taveras | 2.930 | 2018 | |
| 61 | Manny Flores | 2.937 | 2028 | |
| 62 | Jake Layton# | 2.945 | 2034 | |
| 63 | Shane Greenwood# | 2.971 | 2030 | |
| 64 | Dave Hanegan# | 3.000 | 2032 | |
| 64 | Ivan Guerrero | 3.000 | 2020 | |
| 66 | Esteban Yan | 3.028 | 1993 | |
| 67 | Josh Cooksey | 3.033 | 2022 | |
| 68 | Scott Arnold | 3.055 | 1984 | |
| 69 | Chris Dufner# | 3.102 | 2035 | |
| 70 | Cristian Castillo | 3.125 | 2016 | |
| 71 | Randall Delgado | 3.130 | 2008 | |
| 72 | Ken Napier | 3.137 | 2025 | |
| 73 | Kyle Greenwalt | 3.140 | 2008 | |
| 74 | Johzan Oquendo | 3.152 | 2022 | |
| 75 | Jeremy Motts | 3.211 | 2024 | |
| 76 | Jorge de la Rosa | 3.222 | 2030 | |
| 77 | Carl Bouldin | 3.231 | 1961 | |
| 78 | Garrett Davila | 3.282 | 2020 | |
| 79 | Yender Caramo | 3.296 | 2012 | |
| 80 | Tim Shibuya | 3.299 | 2011 | |
| 81 | Willie Castro | 3.327 | 2031 | |
| 82 | Zach Spears | 3.359 | 2022 | |
| 82 | Yorfran Green# | 3.359 | 2031 | |
| 82 | Noah Murdock | 3.359 | 2020 | |
| 85 | Grant Balfour | 3.361 | 1998 | |
| 86 | Ian Oxnevad | 3.375 | 2016 | |
| 86 | Mike Mendoza | 3.375 | 2032 | |
| 88 | Angel Cespedes | 3.423 | 2010 | |
| 89 | George Mieses | 3.449 | 2010 | |
| 90 | Chandler Casey | 3.456 | 2022 | |
| 91 | Josh Vroman# | 3.500 | 2035 | |
| 92 | Kyle Davies | 3.505 | 2002 | |
| 93 | Gabe Skane# | 3.539 | 2034 | |
| 94 | Jose Lugo | 3.559 | 2006 | |
| 95 | Chris Huerta | 3.566 | 2024 | |
| 96 | Bobby MacLeod | 3.592 | 2030 | |
| 97 | Ted Countryman# | 3.632 | 2033 | |
| 98 | Tommie Chapin | 3.635 | 2024 | |
| 99 | Gabriel Noguera | 3.642 | 2020 | |
| 100 | Steve Blateric | 3.646 | 1966 |
