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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | R.J. Manning* | 2.042 | 2004-2019 | |
| 2 | Reynaldo Jimenez* | 2.060 | 2002-2022 | |
| 3 | Diego Lovera* | 2.078 | 2010-2025 | |
| 4 | Pancho Herrera | 2.228 | 1987-2002 | |
| 5 | Ken Bayer* | 2.253 | 1986-2004 | |
| 6 | Andy Phillips | 2.257 | 2042-2057 | |
| 7 | Koichi Nakashima* | 2.275 | 1995-2015 | |
| 8 | Jamie Gruell | 2.276 | 2000-2016 | |
| 9 | Hans Gordinho | 2.278 | 1991-2006 | |
| 10 | Clarence Ortíz | 2.298 | 1990-2006 | |
| 11 | Edgar Fajardo | 2.394 | 2002-2022 | |
| 12 | T.J. Mileski | 2.397 | 2000-2015 | |
| 13 | Martin Carlton | 2.403 | 1978-1991 | |
| 14 | Vernon Simmonds* | 2.436 | 1978-1996 | |
| 15 | Dae-hee Yi | 2.464 | 1988-2007 | |
| 16 | Tod Steffen# | 2.554 | 2050-2060 | |
| 17 | Tom Kastner | 2.569 | 2031-2047 | |
| 18 | Adrián Díaz | 2.597 | 1985-2005 | |
| 19 | Shinji Yamashita | 2.629 | 2004-2019 | |
| 20 | J.J. Ballos | 2.636 | 1999-2013 | |
| 21 | Edgar Mejia* | 2.643 | 2002-2016 | |
| 22 | Pat Bryant | 2.658 | 1998-2016 | |
| 23 | Pat Evans* | 2.669 | 2008-2024 | |
| 23 | A.J. Ingle* | 2.669 | 2018-2040 | |
| 25 | Tony Ramos* | 2.689 | 2033-2047 | |
| 26 | Tom Jensen | 2.701 | 2025-2045 | |
| 27 | Víctor Rivera | 2.704 | 1994-2008 | |
| 28 | Joe Chavarraga* | 2.711 | 1978-1987 | |
| 29 | Barton Mejia* | 2.732 | 2034-2045 | |
| 30 | Gil O'Moore* | 2.743 | 1980-1996 | |
| 31 | Pat Dimmick* | 2.744 | 1991-2005 | |
| 32 | Ethan Jackson | 2.745 | 2025-2040 | |
| 33 | Rahjon Anderson# | 2.752 | 2052-2060 | |
| 34 | Hisashi Tanaka | 2.758 | 1998-2015 | |
| 35 | David Rodriguez* | 2.762 | 1999-2021 | |
| 36 | Christian Vines | 2.769 | 2040-2052 | |
| 37 | Twymond Atif | 2.774 | 2043-2056 | |
| 38 | Wayne van Slyke | 2.779 | 1978-1992 | |
| 39 | Abayghur Tulun | 2.789 | 1994-2012 | |
| 40 | Daniel Alvarez | 2.793 | 1999-2013 | |
| 41 | Pat Yahn* | 2.800 | 2007-2021 | |
| 42 | Ron Osborn | 2.802 | 2015-2029 | |
| 43 | Alejandro Portillo | 2.814 | 2015-2029 | |
| 44 | Graham Hunter# | 2.817 | 2044-2059 | |
| 45 | Brock Bumbarger# | 2.821 | 2043-2059 | |
| 46 | Danny Rodriquez | 2.822 | 1995-2009 | |
| 47 | Ken Burns# | 2.826 | 2053-2060 | |
| 48 | Basil Petrohilos | 2.852 | 1991-2006 | |
| 49 | Travis Oelschlager | 2.859 | 1993-2009 | |
| 50 | Gil Brummett* | 2.864 | 2006-2018 | |
| 51 | Iván Galló | 2.871 | 1990-2004 | |
| 52 | Robby Scriber | 2.881 | 2007-2022 | |
| 53 | Donato Guardamagni* | 2.882 | 1978-1995 | |
| 54 | Doug Liggins | 2.883 | 1978-1990 | |
| 55 | Zack Reeves* | 2.892 | 2005-2025 | |
| 56 | Jimmy Shaw | 2.896 | 2020-2028 | |
| 57 | Jaylen Mitchell | 2.902 | 2013-2026 | |
| 58 | Walter Lacour | 2.910 | 1978-1984 | |
| 59 | Seinosuke Sakuma | 2.918 | 1991-2008 | |
| 60 | Ed Carroll* | 2.919 | 2016-2032 | |
| 61 | Todd Taylor* | 2.923 | 2004-2021 | |
| 62 | Alex Salazar | 2.931 | 2017-2034 | |
| 63 | Ismael Ramírez | 2.944 | 1995-2010 | |
| 64 | B.J. Swisher | 2.948 | 2016-2029 | |
| 65 | Jaime Stone* | 2.952 | 2018-2032 | |
| 66 | Marco Perez | 2.953 | 1999-2014 | |
| 67 | Gavin Weakley | 2.964 | 2038-2055 | |
| 68 | Chris Flores | 2.969 | 1997-2012 | |
| 68 | Buddy Engel | 2.969 | 2037-2049 | |
| 70 | Derek Bell | 2.972 | 2038-2051 | |
| 70 | Brian Hanrahan | 2.972 | 1978-1998 | |
| 72 | Joe O'Connelan | 2.973 | 1978-1985 | |
| 73 | Pat Knight | 2.975 | 1999-2017 | |
| 74 | Edgar Salazar | 2.982 | 1993-2014 | |
| 75 | Alex Dominguez* | 2.984 | 2020-2032 | |
| 76 | Dusty Casserino | 2.985 | 2002-2019 | |
| 77 | Tom Driggs* | 2.989 | 2016-2027 | |
| 78 | Colm Engle | 2.991 | 1989-2004 | |
| 79 | Mauro Espadanal | 2.993 | 2000-2017 | |
| 80 | Kenshin Krsnich | 3.007 | 1978-1993 | |
| 81 | Sandy Franco | 3.010 | 2001-2016 | |
| 82 | Khalil Corey | 3.012 | 2021-2036 | |
| 83 | Garret Letterle | 3.015 | 2043-2057 | |
| 83 | Joe Ponte* | 3.015 | 1978-1991 | |
| 85 | Johnny McDade* | 3.017 | 2011-2028 | |
| 85 | Reid Rothstein# | 3.017 | 2044-2060 | |
| 87 | Pat Cinelli* | 3.027 | 2015-2031 | |
| 88 | Erik Pearsall | 3.028 | 2008-2020 | |
| 89 | Dunmore Theodore* | 3.034 | 1978-1994 | |
| 90 | Johnny Talley* | 3.046 | 2010-2024 | |
| 91 | Raúl Reyes | 3.062 | 1989-2005 | |
| 92 | Darius Huschke# | 3.064 | 2048-2060 | |
| 92 | Garret Clausnitzer | 3.064 | 2029-2048 | |
| 94 | Tom Calligan | 3.068 | 2015-2027 | |
| 95 | Tom Downs | 3.071 | 1999-2011 | |
| 96 | Dave Teel* | 3.075 | 2015-2035 | |
| 97 | Adrian Pulido* | 3.080 | 2007-2026 | |
| 98 | Tom King | 3.083 | 2022-2038 | |
| 99 | Teagan Corrigan* | 3.085 | 1978-1992 | |
| 100 | Robby English | 3.089 | 2005-2017 |
