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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Joba Chamberlain | 1.065 | 2007 | |
| 2 | Steve White | 1.120 | 2009 | |
| 3 | Craig O'Brien# | 1.197 | 2020 | |
| 4 | Marcel Vervoort# | 1.210 | 2021 | |
| 5 | Steve Hewer | 1.306 | 2006 | |
| 6 | Archie Esparza# | 1.313 | 2020 | |
| 7 | Tom O'Toole | 1.443 | 2009 | |
| 8 | Ben Parks# | 1.453 | 2014 | |
| 9 | Harry Hutchinson# | 1.455 | 2019 | |
| 10 | Dave French | 1.515 | 2014 | |
| 11 | Anderson Fergerson | 1.551 | 2009 | |
| 12 | Roland Gates | 1.553 | 2007 | |
| 13 | Rick Hartman# | 1.565 | 2014 | |
| 14 | Tom O'Toole | 1.568 | 2008 | |
| 15 | Johnny Cueto | 1.593 | 2007 | |
| 16 | Bill Gill# | 1.603 | 2018 | |
| 17 | Aaron Preston | 1.609 | 2020 | |
| 18 | Alfredo Gómez# | 1.627 | 2023 | |
| 19 | Elton Anderson | 1.642 | 2006 | |
| 20 | Manny Romero# | 1.657 | 2014 | |
| 21 | Robert Weaver | 1.674 | 2009 | |
| 22 | Jude Smith | 1.684 | 2014 | |
| 23 | Anibal Sanchez | 1.688 | 2006 | |
| 24 | Gio Gonzalez | 1.722 | 2007 | |
| 25 | Tuu Fueunati# | 1.738 | 2020 | |
| 25 | Chris Johnson# | 1.738 | 2018 | |
| 27 | Bob Frazier# | 1.740 | 2014 | |
| 28 | Ronald Moyer# | 1.768 | 2017 | |
| 29 | Michael Thomas# | 1.823 | 2020 | |
| 30 | Bob Deeter | 1.825 | 2014 | |
| 31 | Tuu Fueunati# | 1.836 | 2021 | |
| 32 | Luis López# | 1.837 | 2023 | |
| 33 | Eddie Wright | 1.847 | 2014 | |
| 34 | Derek Collins# | 1.866 | 2020 | |
| 35 | Johnny Cueto | 1.869 | 2008 | |
| 36 | Bradley McGuire | 1.871 | 2014 | |
| 37 | Steve White | 1.887 | 2010 | |
| 38 | Jesse Hayes# | 1.896 | 2014 | |
| 39 | Kenny Carlson | 1.898 | 2014 | |
| 40 | Carlos Zaragoza | 1.913 | 2008 | |
| 41 | Payton Armstrong | 1.917 | 2018 | |
| 42 | Keith McCoy# | 1.932 | 2014 | |
| 43 | Bill Gill# | 1.947 | 2017 | |
| 44 | Charlie Shepard | 1.951 | 2014 | |
| 45 | Fred Garrett | 1.965 | 2014 | |
| 46 | George Burke# | 1.968 | 2013 | |
| 47 | Roy Williamson# | 1.969 | 2014 | |
| 48 | Jake McGee | 1.974 | 2009 | |
| 49 | Neal Bowers# | 1.979 | 2014 | |
| 49 | Jake McGee | 1.979 | 2008 | |
| 51 | Roberto Valdéz# | 1.983 | 2022 | |
| 52 | Ralph Sepúlveda# | 1.986 | 2014 | |
| 53 | Bob Águila# | 1.989 | 2021 | |
| 54 | Ronaldo Ramírez | 1.995 | 2008 | |
| 55 | Héctor Luján# | 2.006 | 2014 | |
| 56 | Johnny Cueto | 2.019 | 2006 | |
| 57 | Bill Gill# | 2.024 | 2016 | |
| 58 | Carlos Marmol | 2.029 | 2006 | |
| 59 | Scott Battle | 2.035 | 2009 | |
| 60 | Bill Moore# | 2.048 | 2014 | |
| 61 | Buddy Mitchell | 2.054 | 2008 | |
| 62 | Yovani Gallardo | 2.057 | 2007 | |
| 63 | Mark Larson | 2.060 | 2020 | |
| 64 | Jeff McGinnity# | 2.064 | 2020 | |
| 65 | Fred Garrett | 2.070 | 2015 | |
| 66 | Tony Steward | 2.073 | 2014 | |
| 67 | Víctor Dueñas# | 2.077 | 2014 | |
| 67 | Matt Lucas# | 2.077 | 2015 | |
| 69 | Greg Wheeler | 2.085 | 2018 | |
| 70 | Ted Johnson# | 2.095 | 2014 | |
| 71 | Elías Maldonado# | 2.101 | 2031 | |
| 72 | Kenneth O'Neill# | 2.113 | 2014 | |
| 73 | Alex Cobb | 2.114 | 2008 | |
| 74 | Nick Bitsko# | 2.117 | 2020 | |
| 75 | Joel Zumaya | 2.123 | 2006 | |
| 75 | Mike Moser | 2.123 | 2009 | |
| 75 | Dave Watson | 2.123 | 2014 | |
| 78 | Pedro Figueroa | 2.126 | 2007 | |
| 79 | Joakim Soria | 2.130 | 2006 | |
| 80 | Tim Williams | 2.140 | 2004 | |
| 81 | Roger Powell | 2.145 | 2014 | |
| 82 | Andrew Davis | 2.149 | 2008 | |
| 83 | Kevin Davis | 2.157 | 2008 | |
| 84 | Casey Phelps | 2.160 | 2009 | |
| 85 | Clayton Kershaw | 2.181 | 2009 | |
| 85 | Raúl Mateo# | 2.181 | 2021 | |
| 87 | Roland Gates | 2.186 | 2006 | |
| 88 | Ronald Moyer# | 2.187 | 2016 | |
| 89 | Roland Gates | 2.189 | 2008 | |
| 90 | Ángel López# | 2.191 | 2023 | |
| 91 | Charlie Martin | 2.201 | 2014 | |
| 91 | Ray McEol | 2.201 | 2006 | |
| 93 | Joba Chamberlain | 2.211 | 2006 | |
| 94 | John Lambert# | 2.225 | 2017 | |
| 95 | Andre Logan# | 2.229 | 2022 | |
| 96 | Jose Berrios# | 2.234 | 2019 | |
| 96 | Miguel Escobedo# | 2.234 | 2031 | |
| 98 | Kevin Smith# | 2.250 | 2020 | |
| 99 | Gil Davis# | 2.254 | 2014 | |
| 100 | Kevin Miller# | 2.258 | 2014 |
