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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Ryan Weiss | 1.015 | 2022 | |
| 2 | Adam Cowart | 1.080 | 2006 | |
| 3 | David Castillo# | 1.355 | 2035 | |
| 4 | Bob Baird | 1.361 | 1966 | |
| 5 | Jon Moraila# | 1.588 | 2035 | |
| 6 | Alvaro Talamantes | 1.615 | 2032 | |
| 7 | Chris Bolden | 1.696 | 2026 | |
| 8 | Tim Chaney | 1.766 | 2025 | |
| 9 | Gus Aguiar# | 1.808 | 2034 | |
| 10 | Eric Ford | 1.835 | 2026 | |
| 11 | Amir Fulton# | 1.851 | 2033 | |
| 12 | Helmis Rodriguez | 1.971 | 2014 | |
| 13 | Mitch Peters# | 1.996 | 2031 | |
| 14 | Clint Day# | 2.077 | 2029 | |
| 15 | Jimmy Atkinson# | 2.104 | 2034 | |
| 16 | Joseph Jarneski | 2.118 | 2022 | |
| 17 | Mat Phillips# | 2.174 | 2035 | |
| 18 | Pat Misch | 2.181 | 2003 | |
| 19 | Jared Ray | 2.230 | 2012 | |
| 19 | Angel Guzman | 2.230 | 2001 | |
| 21 | Joe Siefker# | 2.239 | 2026 | |
| 22 | Mike Alexander# | 2.250 | 2033 | |
| 23 | Sean Spurlin# | 2.314 | 2024 | |
| 24 | Carlos Gabriel Hernandez | 2.320 | 2015 | |
| 25 | Vicente Campos | 2.324 | 2011 | |
| 26 | Tony Carranza# | 2.337 | 2035 | |
| 27 | Nate Batten# | 2.348 | 2035 | |
| 28 | Ricky Arana | 2.359 | 2022 | |
| 29 | Andrew Leenhouts | 2.368 | 2015 | |
| 30 | Jordan Durant# | 2.386 | 2035 | |
| 31 | Andy Sisco | 2.433 | 2002 | |
| 32 | Rob Chadwick# | 2.455 | 2036 | |
| 33 | Chris D. Johnson | 2.494 | 2013 | |
| 34 | Jake Hymer# | 2.523 | 2028 | |
| 35 | Cole Bellinger | 2.535 | 2022 | |
| 35 | Steve Conner# | 2.535 | 2036 | |
| 37 | Christian Bergman | 2.589 | 2011 | |
| 38 | David Falcones# | 2.591 | 2024 | |
| 39 | Anthony Fernandez | 2.592 | 2010 | |
| 40 | Juan Caada# | 2.594 | 2034 | |
| 41 | Austin Platt | 2.620 | 2013 | |
| 42 | Brock Bell | 2.631 | 2023 | |
| 43 | Jorge Bucardo | 2.645 | 2009 | |
| 44 | Mike Armstrong | 2.647 | 1974 | |
| 45 | Ryne Nelson | 2.664 | 2022 | |
| 46 | Alex Nevarez# | 2.678 | 2036 | |
| 47 | Doug Mathis | 2.679 | 2005 | |
| 48 | Justin Morris | 2.700 | 2023 | |
| 49 | Dave Bennett | 2.709 | 1964 | |
| 50 | Jared Wells | 2.746 | 2003 | |
| 51 | Jose Abrica# | 2.755 | 2030 | |
| 52 | Jared King# | 2.757 | 2030 | |
| 53 | Steve Conner# | 2.784 | 2035 | |
| 54 | Brendyn Jensen | 2.785 | 2028 | |
| 55 | Mark Ballinger | 2.786 | 1968 | |
| 56 | Randol Rojas | 2.793 | 2010 | |
| 57 | David Pauley | 2.812 | 2002 | |
| 58 | Jeremy Gabryszwski | 2.817 | 2013 | |
| 59 | Bobby Bolin | 2.840 | 1959 | |
| 60 | Bob Melquist | 2.872 | 2028 | |
| 61 | Alexander Carreras | 2.963 | 2012 | |
| 62 | Bruce Billings | 2.975 | 2007 | |
| 63 | Bobby Livingston | 3.025 | 2002 | |
| 64 | Kevin Appier | 3.039 | 1987 | |
| 65 | Rob Wright | 3.092 | 2032 | |
| 66 | Jason Forjet | 3.103 | 2014 | |
| 67 | Walt Lane# | 3.107 | 2033 | |
| 68 | Ricky Granados | 3.124 | 2024 | |
| 69 | Carlos Lara | 3.125 | 2022 | |
| 70 | Vincent Baca | 3.129 | 2026 | |
| 71 | Andy Hopper# | 3.135 | 2035 | |
| 72 | Shawn Nottingham | 3.147 | 2004 | |
| 73 | Cesar Valdez | 3.155 | 2006 | |
| 74 | Jake Brigham | 3.156 | 2007 | |
| 75 | Tim O'Neill# | 3.157 | 2035 | |
| 76 | Bert Ciaccio | 3.176 | 2024 | |
| 76 | Victor Sanchez | 3.176 | 2012 | |
| 76 | Mike Esch# | 3.176 | 2033 | |
| 79 | Ramon Escoto# | 3.189 | 2034 | |
| 80 | Orlando Razo | 3.245 | 2018 | |
| 80 | Bobby Wagnitz# | 3.245 | 2032 | |
| 82 | Mike Barbish | 3.270 | 2022 | |
| 83 | Mike Alsman | 3.301 | 2029 | |
| 84 | Mark DiFelice | 3.306 | 1998 | |
| 85 | Travis Blackley | 3.318 | 2001 | |
| 86 | Ken Compton | 3.349 | 2021 | |
| 87 | Trevor Hurley | 3.361 | 2009 | |
| 88 | Ryan Warner | 3.362 | 2013 | |
| 89 | Johendi Jiminian | 3.375 | 2013 | |
| 90 | Ricky Mesquita | 3.390 | 2028 | |
| 91 | Adam Kudryk | 3.401 | 2011 | |
| 92 | Joe Bitker | 3.414 | 1984 | |
| 93 | Jeff Harbin | 3.419 | 2027 | |
| 94 | Keith Atherton | 3.424 | 1978 | |
| 95 | Tyreek White# | 3.447 | 2034 | |
| 96 | Shawn Sedlacek | 3.453 | 1998 | |
| 97 | Erik Bennett | 3.469 | 1989 | |
| 98 | Oliver Roque | 3.480 | 2024 | |
| 99 | Justin Germano | 3.487 | 2001 | |
| 100 | Eric Swallow# | 3.488 | 2025 |
