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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Pat Carmichael# | 2.25 | 2023-2035 | |
| 2 | Junior Cuomo* | 2.59 | 2004-2023 | |
| 3 | Demarcus Ramirez* | 2.79 | 2002-2018 | |
| 4 | Toyoshige Takahashi# | 2.82 | 2025-2035 | |
| 5 | Chad Nelligan* | 2.84 | 2004-2016 | |
| 5 | Timothy Vallejo* | 2.84 | 2005-2023 | |
| 7 | Albert Garcia | 2.88 | 2002-2012 | |
| 8 | Willie Sewell | 3.08 | 2005-2018 | |
| 8 | Christopher Hester* | 3.08 | 2008-2025 | |
| 10 | Troy Nelson | 3.09 | 2002-2010 | |
| 10 | Ronald Placencia* | 3.09 | 2009-2023 | |
| 12 | Juan Villatoro* | 3.16 | 2009-2026 | |
| 13 | Richard Pimental | 3.21 | 2002-2014 | |
| 14 | William Brooks# | 3.23 | 2028-2035 | |
| 15 | Dalton Davis | 3.29 | 2008-2024 | |
| 15 | Chris Williams# | 3.29 | 2027-2035 | |
| 17 | Craig Barmore | 3.31 | 2002-2006 | |
| 18 | Joong-geun Yi# | 3.33 | 2026-2035 | |
| 18 | Wendell Sorg | 3.33 | 2002-2011 | |
| 20 | Sherman Wheeler | 3.34 | 2004-2015 | |
| 21 | Thomas Cohen | 3.35 | 2010-2019 | |
| 22 | Steven Jurgens | 3.36 | 2002-2008 | |
| 23 | Hobert Hagerty | 3.39 | 2002-2008 | |
| 23 | Frank Caroll | 3.39 | 2002-2014 | |
| 25 | Ernest Delamora | 3.40 | 2002-2008 | |
| 26 | Kyle Fike | 3.41 | 2010-2024 | |
| 27 | Juan Morrales | 3.42 | 2018-2023 | |
| 27 | Luis Diaz | 3.42 | 2002-2010 | |
| 29 | Michael Leach# | 3.47 | 2031-2035 | |
| 30 | Scott Mayhew | 3.49 | 2002-2008 | |
| 31 | Mark Deschamp | 3.50 | 2002-2013 | |
| 32 | Casey Plunk | 3.51 | 2002-2011 | |
| 32 | John Okane* | 3.51 | 2003-2022 | |
| 32 | Isaac Diehl | 3.51 | 2009-2020 | |
| 35 | Bill Siple | 3.52 | 2002-2012 | |
| 36 | Enrico Hernández | 3.56 | 2018-2032 | |
| 37 | Fernando Estrada | 3.59 | 2010-2026 | |
| 38 | James Turner | 3.61 | 2010-2025 | |
| 38 | Jorge Reyes# | 3.61 | 2030-2035 | |
| 38 | Alejandro Báez# | 3.61 | 2028-2035 | |
| 38 | Bill Clark | 3.61 | 2002-2009 | |
| 42 | Harold Gregory# | 3.62 | 2030-2035 | |
| 43 | Bill Dewall | 3.63 | 2009-2024 | |
| 44 | Ernest Metcalf# | 3.64 | 2022-2035 | |
| 44 | Peter Bird | 3.64 | 2002-2012 | |
| 46 | Alberto Carballo | 3.65 | 2009-2015 | |
| 46 | Eric Setliff | 3.65 | 2002-2011 | |
| 48 | Sabas Delvalle | 3.69 | 2007-2016 | |
| 49 | Tian-bai Chen# | 3.70 | 2024-2035 | |
| 50 | Joshua Stoker | 3.73 | 2013-2032 | |
| 51 | Steven White | 3.74 | 2002-2008 | |
| 51 | Erik Moore# | 3.74 | 2023-2035 | |
| 51 | Pedro Ramos | 3.74 | 2006-2023 | |
| 51 | Patrick Beene# | 3.74 | 2021-2035 | |
| 55 | Ferdinand Pineda | 3.75 | 2013-2020 | |
| 56 | Jonathan Starner | 3.77 | 2002-2011 | |
| 57 | Carlos Árias | 3.78 | 2016-2031 | |
| 58 | Allen Rueter | 3.80 | 2011-2022 | |
| 59 | Víctor Rivera# | 3.82 | 2025-2035 | |
| 60 | Bruno Talamantez | 3.83 | 2014-2031 | |
| 61 | Charles Midgett | 3.84 | 2002-2013 | |
| 62 | Ed Scull | 3.85 | 2003-2018 | |
| 63 | Will Hickford# | 3.88 | 2026-2035 | |
| 64 | Juan Santiago# | 3.89 | 2028-2035 | |
| 64 | Ronald Adorno | 3.89 | 2009-2021 | |
| 66 | Jimmy Matthias | 3.93 | 2010-2016 | |
| 67 | William Augustin | 3.97 | 2002-2013 | |
| 67 | Donald Dinwiddie | 3.97 | 2006-2019 | |
| 69 | Ron Hill# | 3.98 | 2027-2035 | |
| 70 | Dennis Durand | 3.99 | 2012-2025 | |
| 71 | Earle Stollings | 4.00 | 2002-2011 | |
| 72 | Juan Guerrera | 4.01 | 2015-2032 | |
| 73 | Joseph Macaluso | 4.02 | 2011-2027 | |
| 73 | James Cropper | 4.02 | 2010-2021 | |
| 73 | Yoshifumi Tanaka | 4.02 | 2022-2032 | |
| 73 | Joe Daye | 4.02 | 2002-2012 | |
| 73 | Yorikane Kichikawa# | 4.02 | 2024-2035 | |
| 78 | Deandre Desrosiers | 4.03 | 2002-2009 | |
| 79 | Fredrick Thomas | 4.04 | 2011-2018 | |
| 79 | Jim Knowles# | 4.04 | 2023-2035 | |
| 81 | Kieran Rose# | 4.05 | 2027-2035 | |
| 82 | Jeffrey Shuttleworth | 4.07 | 2004-2022 | |
| 82 | Jose Delagarza | 4.07 | 2003-2012 | |
| 84 | Jesus Morales | 4.09 | 2011-2021 | |
| 85 | Bradford Mcgreevy | 4.10 | 2007-2015 | |
| 86 | Rocco Wojcik | 4.11 | 2002-2011 | |
| 87 | Nicolas Vargas | 4.12 | 2014-2028 | |
| 87 | Dario Lopez | 4.12 | 2010-2023 | |
| 89 | Dave Klein# | 4.13 | 2022-2035 | |
| 90 | Gene Icenhour | 4.14 | 2002-2011 | |
| 90 | Ethan Moyer | 4.14 | 2015-2029 | |
| 92 | Gregg Fiala | 4.15 | 2014-2033 | |
| 93 | Tahachirou Shinsaku | 4.16 | 2006-2011 | |
| 94 | Jeffrey Brunton | 4.18 | 2011-2024 | |
| 95 | Isidro Frau | 4.19 | 2009-2016 | |
| 96 | Ronald Kirkwood | 4.20 | 2002-2011 | |
| 96 | Frank Osborne | 4.20 | 2005-2019 | |
| 98 | José Montáñez# | 4.21 | 2025-2035 | |
| 99 | Roy Watts | 4.22 | 2027-2034 | |
| 100 | Hector Orozco | 4.24 | 2007-2020 |
