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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Reno López | 1.109 | 1993 | |
| 2 | Danny Colon | 1.441 | 2010 | |
| 3 | Dillon Webster | 1.481 | 2049 | |
| 4 | Tom Hall | 1.510 | 1999 | |
| 5 | Ryne Woodrum | 1.539 | 2034 | |
| 6 | Ron Burton | 1.576 | 2003 | |
| 7 | Rashaan Loomans# | 1.649 | 2049 | |
| 8 | Johnny Lawson# | 1.654 | 2053 | |
| 9 | Kristoffer Ball | 1.655 | 2024 | |
| 10 | Danny Gonzalez | 1.679 | 2002 | |
| 11 | Manny Martínez | 1.727 | 1991 | |
| 12 | Evandro Dionsio | 1.742 | 2002 | |
| 13 | Ricky Rangel | 1.748 | 2007 | |
| 14 | Brian Price# | 1.758 | 2053 | |
| 15 | Kobe Scott# | 1.760 | 2053 | |
| 16 | Jamie Ohmer | 1.761 | 2009 | |
| 17 | Marco Aguirre | 1.762 | 2014 | |
| 18 | Adalberto Norberto | 1.771 | 1990 | |
| 19 | Tom Banks | 1.800 | 2014 | |
| 20 | Khadeen Kianyandaarwa | 1.804 | 2037 | |
| 21 | Ollie Kane | 1.808 | 1989 | |
| 22 | Tim Ritchey | 1.819 | 1978 | |
| 23 | Dave Hinnant | 1.840 | 1982 | |
| 24 | Anastasio López | 1.843 | 1988 | |
| 25 | Bernard Purglove | 1.879 | 1998 | |
| 26 | Curt Webber# | 1.882 | 2053 | |
| 27 | Joshua Businelle# | 1.893 | 2046 | |
| 28 | Franklin Schwartz# | 1.901 | 2053 | |
| 29 | Jimmy Cogan | 1.906 | 1997 | |
| 30 | Manny Reyna | 1.929 | 2012 | |
| 31 | Zack Kelley | 1.933 | 2012 | |
| 32 | Saúl Soriano | 1.961 | 1981 | |
| 32 | Robby Pearce | 1.961 | 1997 | |
| 34 | Doug Bates | 1.981 | 1993 | |
| 35 | Zack Kump | 2.000 | 2008 | |
| 35 | Bob Contreras | 2.000 | 2014 | |
| 37 | Roger Villasenor | 2.008 | 2017 | |
| 38 | Matsuichi Kamiya | 2.027 | 2009 | |
| 39 | David Loya | 2.030 | 2016 | |
| 39 | Brendin Basham# | 2.030 | 2053 | |
| 41 | James Schiller# | 2.041 | 2048 | |
| 41 | Jimmy Bires | 2.041 | 2017 | |
| 43 | Earl Mariote | 2.045 | 1985 | |
| 44 | Dave Adamson | 2.057 | 2006 | |
| 45 | Jimmy Naughton | 2.058 | 2013 | |
| 46 | Ed Longoria | 2.062 | 2002 | |
| 47 | Dan Hoskin | 2.071 | 1982 | |
| 47 | David Tardif | 2.071 | 1982 | |
| 49 | Broderick Farquharson | 2.072 | 2001 | |
| 50 | Lorenzo Guzman | 2.088 | 2000 | |
| 51 | Erik Pearsall | 2.092 | 2006 | |
| 52 | Samuel Norris | 2.094 | 2023 | |
| 53 | Cris Morán | 2.097 | 1991 | |
| 54 | Dave Boyle | 2.109 | 2021 | |
| 55 | Pat Hall | 2.115 | 2017 | |
| 56 | Curt Webber# | 2.116 | 2052 | |
| 57 | Dario Hidalgo | 2.118 | 2006 | |
| 57 | Pat Alley | 2.118 | 2034 | |
| 59 | Herman Simmons | 2.120 | 2048 | |
| 60 | Raúl Carrillo | 2.123 | 1986 | |
| 61 | Clarence Lyon | 2.129 | 2007 | |
| 62 | Joel McCarthy# | 2.139 | 2059 | |
| 63 | Fred Dashner | 2.140 | 2005 | |
| 64 | Khristian Boudiaf# | 2.146 | 2053 | |
| 65 | Pat Kaufman | 2.152 | 2015 | |
| 66 | Pepe Rodríguez | 2.158 | 1987 | |
| 66 | Terry Copeland | 2.158 | 2007 | |
| 68 | Pat Gardner | 2.160 | 2013 | |
| 69 | Nate Bettis | 2.170 | 2033 | |
| 70 | Shawn Gates | 2.172 | 1985 | |
| 71 | Byung-kyu Khang | 2.176 | 2006 | |
| 71 | Ed Steinbach | 2.176 | 2031 | |
| 73 | Tyler Garner | 2.181 | 2005 | |
| 74 | Gary Hampton | 2.189 | 2054 | |
| 74 | Dave Blau | 2.189 | 2032 | |
| 76 | Ki-hyeon Lim | 2.192 | 1992 | |
| 77 | Cole Carroll# | 2.205 | 2052 | |
| 78 | Gene Ferguson | 2.212 | 1994 | |
| 79 | Sonny Harper | 2.219 | 2026 | |
| 80 | Ezequiel Alvarado | 2.221 | 2010 | |
| 81 | Kirk Loose# | 2.222 | 2051 | |
| 82 | Levi Marinaccio | 2.234 | 2053 | |
| 83 | Robby Berry | 2.235 | 2014 | |
| 84 | Turner Hicks# | 2.236 | 2052 | |
| 85 | Jason Justice | 2.239 | 1993 | |
| 86 | Pat Kimmick | 2.244 | 2016 | |
| 86 | Gene Ferguson | 2.244 | 2000 | |
| 88 | Eric Wade | 2.256 | 2024 | |
| 89 | Atsushi Abe | 2.262 | 2011 | |
| 90 | Nero Taveras | 2.268 | 2039 | |
| 90 | J.R. Neel | 2.268 | 1998 | |
| 90 | Manny Chávez | 2.268 | 1993 | |
| 93 | Raulo Gutiérrez* | 2.269 | 1989 | |
| 94 | Devin Trimble | 2.272 | 2039 | |
| 95 | Dan Huckeba# | 2.274 | 2048 | |
| 96 | Pat Howard | 2.285 | 2012 | |
| 96 | Cris Morán | 2.285 | 1989 | |
| 98 | Heriberto Rocha | 2.286 | 2003 | |
| 99 | Rhett Erickson | 2.287 | 1987 | |
| 100 | Raúl Hernández | 2.291 | 1987 |
