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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Willie Mejia | 0.260 | 2023-2037 | |
| 2 | Edwin Madrigal | 0.545 | 2022-2036 | |
| 3 | D.J. Boyer | 0.750 | 1980-1982 | |
| 4 | Juan Arteaga | 1.071 | 1992-2002 | |
| 5 | Emeka Tofic | 1.301 | 2036-2050 | |
| 6 | Pat Judd# | 1.397 | 2040-2050 | |
| 7 | Mike Waters | 1.408 | 1980-1991 | |
| 8 | Brandon Miyamoto | 1.436 | 2035-2047 | |
| 9 | Ken Berg | 1.464 | 1980-1986 | |
| 10 | Blake Garito | 1.500 | 2010-2019 | |
| 11 | Jesse Hyde | 1.508 | 2020-2034 | |
| 12 | Jimmy Moore# | 1.617 | 2043-2050 | |
| 13 | Vitorio Taveras# | 1.620 | 2046-2050 | |
| 14 | Chris Koll | 1.641 | 2025-2038 | |
| 15 | D.J. Schultheis | 1.658 | 2031-2047 | |
| 16 | Rogelio Flores | 1.670 | 1999-2004 | |
| 17 | Sam Bone | 1.679 | 1999-2012 | |
| 18 | Ean Holby# | 1.720 | 2048-2050 | |
| 19 | Rowell Morrison# | 1.723 | 2039-2050 | |
| 20 | Alain Favreau | 1.728 | 1996-2011 | |
| 21 | Roscoe Marquet | 1.734 | 2040-2049 | |
| 22 | Ryan Howard | 1.765 | 1980-1988 | |
| 23 | Mason Long# | 1.824 | 2040-2050 | |
| 24 | Austin Defenbaugh# | 1.846 | 2043-2050 | |
| 25 | Jesus Ibarra | 1.853 | 2030-2042 | |
| 26 | Alfredo Garza* | 1.862 | 1993-2011 | |
| 27 | Nate Medley | 1.901 | 1983-1995 | |
| 28 | Marcus Graham# | 1.940 | 2041-2050 | |
| 29 | Cayden Leroy | 1.971 | 2041-2048 | |
| 30 | Tyler Perman | 1.976 | 2033-2042 | |
| 30 | Antonio Viruet | 1.976 | 2030-2045 | |
| 32 | Ryan Kraus | 1.988 | 1984-1998 | |
| 33 | Danny Tellez | 2.000 | 2032-2041 | |
| 34 | Jason Burks | 2.011 | 2026-2034 | |
| 34 | Alex Quinones | 2.011 | 2035-2047 | |
| 36 | Mike Caulder | 2.054 | 1980-1991 | |
| 37 | Nick Levinson# | 2.077 | 2050-2050 | |
| 38 | Dax Moore# | 2.084 | 2045-2050 | |
| 39 | Rich Willis* | 2.087 | 2026-2040 | |
| 40 | Roberto Farfan | 2.092 | 2034-2047 | |
| 41 | Zach Gosney | 2.100 | 1980-1986 | |
| 42 | Chris Huffman | 2.118 | 1980-1989 | |
| 42 | Ray Wooten | 2.118 | 2034-2044 | |
| 44 | Neville Mahaffey# | 2.127 | 2039-2050 | |
| 45 | Manuel Ochoa | 2.140 | 2018-2031 | |
| 46 | Danny Bradley | 2.186 | 2025-2039 | |
| 47 | Steve Audi | 2.231 | 1999-2009 | |
| 48 | Chris Scarborough | 2.250 | 1990-2000 | |
| 48 | Steve Young | 2.250 | 2010-2024 | |
| 50 | Ryan Greene* | 2.265 | 2016-2033 | |
| 51 | Jonathan Bream | 2.292 | 2016-2029 | |
| 52 | Edgar Gomez | 2.300 | 2029-2043 | |
| 53 | Joey James | 2.302 | 1999-2013 | |
| 54 | Joe Collins | 2.303 | 1980-1991 | |
| 55 | Rusty Estes | 2.314 | 2021-2033 | |
| 55 | Gabriel Tejada | 2.314 | 2041-2049 | |
| 57 | Ryan Zuleger# | 2.320 | 2040-2050 | |
| 58 | Daniel Berndt | 2.337 | 2031-2036 | |
| 59 | Eddie Hammer | 2.339 | 2026-2033 | |
| 59 | Julien Piché# | 2.339 | 2042-2050 | |
| 61 | Brad Ragin | 2.374 | 2003-2012 | |
| 62 | Leo Angeles | 2.395 | 2023-2036 | |
| 63 | Nate Beard | 2.400 | 2001-2011 | |
| 63 | Derek Livengood# | 2.400 | 2049-2050 | |
| 63 | Scott Sears | 2.400 | 2010-2024 | |
| 66 | Declan Jones# | 2.404 | 2040-2050 | |
| 67 | Lyle Almaguer# | 2.411 | 2036-2050 | |
| 68 | Ben Duncan* | 2.433 | 1987-2002 | |
| 69 | Juan Villasana | 2.436 | 2006-2011 | |
| 70 | Rusty James | 2.455 | 2033-2045 | |
| 71 | Chris Graves | 2.471 | 1994-2007 | |
| 72 | Dave Derby | 2.473 | 1981-1992 | |
| 73 | Lucio Frangipani | 2.475 | 1997-2007 | |
| 74 | Luis Mercado | 2.480 | 2027-2042 | |
| 75 | Job Jenkins | 2.483 | 2034-2042 | |
| 76 | Gilberto Meza | 2.500 | 2004-2015 | |
| 77 | Murray Yallop# | 2.522 | 2040-2050 | |
| 78 | Landon Basinger# | 2.531 | 2040-2050 | |
| 79 | Steve Vines | 2.537 | 2007-2021 | |
| 80 | Mike Hill | 2.539 | 1987-1997 | |
| 81 | Esteban Preciado | 2.547 | 1984-1994 | |
| 82 | Ernesto Pons* | 2.557 | 1999-2016 | |
| 83 | Murdock Achber | 2.559 | 2006-2019 | |
| 84 | Jordan Dozier# | 2.580 | 2047-2050 | |
| 85 | Oliver Abatemarco | 2.585 | 2034-2047 | |
| 86 | Devan Blaylock | 2.600 | 1981-1994 | |
| 87 | Chad Conover | 2.602 | 1996-2004 | |
| 88 | Nate Kroll | 2.613 | 1984-2000 | |
| 89 | Winton Harrow | 2.619 | 1980-1987 | |
| 90 | Ron Locey | 2.621 | 2018-2024 | |
| 91 | Adrian Salinas | 2.634 | 2028-2044 | |
| 92 | Cesar Almeida | 2.641 | 2026-2040 | |
| 93 | Willie Dillard | 2.656 | 1992-2008 | |
| 93 | Juan Hurtado | 2.656 | 2000-2013 | |
| 93 | Jake Martin | 2.656 | 2015-2030 | |
| 96 | Jaheim Wootson | 2.659 | 2003-2016 | |
| 97 | Bobby Aguilar* | 2.662 | 2033-2046 | |
| 98 | Antoine Berrios# | 2.670 | 2039-2050 | |
| 99 | Christopher Albaugh# | 2.673 | 2047-2050 | |
| 100 | Clark Bryant# | 2.694 | 2040-2050 |
