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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Brad Arnsberg | 1.592 | 1985 | |
| 2 | Juan Carrion# | 1.636 | 2032 | |
| 3 | Bobby Vonderheide# | 1.652 | 2032 | |
| 4 | Dick Baney | 1.841 | 1968 | |
| 5 | Ed Barnowski | 1.983 | 1965 | |
| 6 | Eric Surkamp | 2.023 | 2011 | |
| 7 | Denny Larrondo | 2.054 | 2025 | |
| 8 | Jorge Talamantes | 2.144 | 2035 | |
| 9 | Fred Beene | 2.160 | 1966 | |
| 10 | Antoine Brown# | 2.220 | 2032 | |
| 11 | Dave Bennett | 2.221 | 1970 | |
| 12 | Chris Heston | 2.240 | 2012 | |
| 13 | Mark Bomback | 2.319 | 1975 | |
| 14 | Heriberto Gonzalez# | 2.358 | 2032 | |
| 15 | Amir Webb# | 2.381 | 2035 | |
| 16 | Bobby Vonderheide# | 2.423 | 2034 | |
| 17 | Ramon Palacios | 2.441 | 2026 | |
| 18 | Gilberto Montoya# | 2.450 | 2032 | |
| 18 | Steve Barr | 2.450 | 1974 | |
| 20 | Rudy Owens | 2.460 | 2010 | |
| 21 | Chad Kuhl | 2.476 | 2015 | |
| 22 | Elmer Dessens | 2.487 | 1995 | |
| 23 | Joe Martinez | 2.493 | 2008 | |
| 24 | Andy Combs | 2.501 | 2030 | |
| 25 | Leonel Flores# | 2.506 | 2032 | |
| 26 | Dan Levanen# | 2.543 | 2033 | |
| 27 | Adrian Sampson | 2.554 | 2014 | |
| 27 | Zac Lowther | 2.554 | 2019 | |
| 29 | Jayson Schroeder | 2.568 | 2026 | |
| 30 | Vince Ago# | 2.582 | 2034 | |
| 31 | Danny Garza# | 2.607 | 2033 | |
| 32 | Forrest Whitley | 2.643 | 2025 | |
| 33 | Robert Colina | 2.660 | 2028 | |
| 34 | Jay Baller | 2.676 | 1982 | |
| 35 | Sergio Caruci# | 2.681 | 2028 | |
| 35 | David Hernandez | 2.681 | 2008 | |
| 37 | Hank Aguirre | 2.685 | 1954 | |
| 38 | Mike Armstrong | 2.700 | 1975 | |
| 39 | Mike Clevinger | 2.734 | 2015 | |
| 40 | Adam Miller | 2.747 | 2006 | |
| 41 | Tommy Beason | 2.750 | 2028 | |
| 42 | Johnny Abrego | 2.763 | 1985 | |
| 43 | Randy Flores | 2.779 | 2001 | |
| 44 | David Cerna# | 2.799 | 2035 | |
| 45 | Oil Can Boyd | 2.810 | 1982 | |
| 45 | Tyler Beede | 2.810 | 2016 | |
| 47 | Bill Atkinson | 2.845 | 1982 | |
| 48 | Hunter Milam | 2.848 | 2025 | |
| 48 | Tommy Milone | 2.848 | 2010 | |
| 50 | Robbie Erlin | 2.850 | 2020 | |
| 51 | Gustavo Chacin | 2.859 | 2004 | |
| 52 | Jeremy Brown# | 2.875 | 2031 | |
| 53 | Tony Armas | 2.886 | 1999 | |
| 54 | Len Barker | 2.887 | 1975 | |
| 55 | Jaden Haygood# | 2.891 | 2030 | |
| 56 | Brian Proulx# | 2.893 | 2035 | |
| 57 | Aaron Phillips | 2.916 | 2021 | |
| 58 | Austin Voth | 2.917 | 2015 | |
| 59 | Trey Benton | 2.922 | 2025 | |
| 60 | Randy Flores | 2.936 | 2000 | |
| 61 | Joe Jones | 2.957 | 2029 | |
| 62 | Roger Rodriguez | 2.989 | 2030 | |
| 63 | Austin Coley | 3.007 | 2017 | |
| 64 | Dave Beard | 3.016 | 1979 | |
| 64 | Cesar Ruiz# | 3.016 | 2033 | |
| 66 | Juan Carrion# | 3.038 | 2033 | |
| 67 | Pete Winstead | 3.042 | 2023 | |
| 67 | Jose Aguilar# | 3.042 | 2032 | |
| 69 | Mike Kickham | 3.046 | 2012 | |
| 70 | Pat Misch | 3.057 | 2004 | |
| 71 | Vince Ago# | 3.060 | 2032 | |
| 72 | Jose Puente | 3.072 | 2026 | |
| 73 | Francisco Cruceta | 3.086 | 2003 | |
| 74 | Justin Wilson | 3.091 | 2010 | |
| 75 | Blake Loubier | 3.106 | 2024 | |
| 76 | Ty Blach | 3.128 | 2014 | |
| 77 | Drew Rom | 3.142 | 2030 | |
| 78 | Dan Denham | 3.150 | 2005 | |
| 79 | Chih-Wei Hu | 3.154 | 2023 | |
| 80 | Ian Snell | 3.159 | 2004 | |
| 81 | Sean Wendell | 3.162 | 2032 | |
| 82 | Brandon Duckworth | 3.164 | 2000 | |
| 83 | JoJo Romero | 3.173 | 2022 | |
| 84 | Shawn Morimando | 3.176 | 2015 | |
| 85 | Chris Pomeroy# | 3.180 | 2036 | |
| 86 | Mike Bielecki | 3.189 | 1983 | |
| 87 | Tyler Mapes | 3.194 | 2016 | |
| 88 | Andry Lara | 3.205 | 2025 | |
| 89 | Brad Bergesen | 3.223 | 2008 | |
| 90 | Danny Matos# | 3.224 | 2036 | |
| 91 | Justin Fitzgerald | 3.225 | 2012 | |
| 92 | Roger Bailey | 3.226 | 1994 | |
| 93 | Jon Rosas | 3.236 | 2029 | |
| 94 | Jhony Brito | 3.250 | 2021 | |
| 95 | Brian Johnson | 3.256 | 2023 | |
| 96 | Mike Wright | 3.258 | 2013 | |
| 96 | Edgar Arredondo | 3.258 | 2021 | |
| 98 | Robbie Matson# | 3.260 | 2033 | |
| 99 | Seth Etherton | 3.274 | 1999 | |
| 100 | Paul Richan | 3.276 | 2024 |
