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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | John Leary | 2.731 | 1998-2010 | |
| 2 | Adam Spurle | 3.090 | 1995-2010 | |
| 3 | Gaspar Garcia | 3.140 | 1997-2006 | |
| 4 | Mathew Krieger | 3.160 | 1999-2018 | |
| 5 | Leonardo González# | 3.190 | 2049-2057 | |
| 6 | Reid Jensen | 3.198 | 2042-2052 | |
| 7 | Brad Peckford# | 3.290 | 2049-2058 | |
| 8 | Raúl García | 3.328 | 1998-2004 | |
| 9 | Alberto Bejinez | 3.331 | 1997-2005 | |
| 9 | Nelson Thompson# | 3.331 | 2046-2056 | |
| 11 | Alfredo Contreras# | 3.342 | 2044-2058 | |
| 12 | Gerardo Arroyo | 3.389 | 2009-2015 | |
| 13 | Jim Pollock# | 3.399 | 2044-2058 | |
| 14 | Quentin Mullins | 3.411 | 2042-2055 | |
| 15 | Liam Quebell# | 3.446 | 2048-2055 | |
| 16 | David Hoskins | 3.449 | 2018-2026 | |
| 17 | Kevin McAdam | 3.490 | 1995-2004 | |
| 18 | Will Ritter# | 3.506 | 2048-2058 | |
| 19 | Ghi-cheng Kum | 3.519 | 2035-2053 | |
| 20 | Nelson Williams | 3.525 | 1998-2009 | |
| 21 | Juan Crespo | 3.539 | 2017-2022 | |
| 22 | Daisuke Tomita | 3.547 | 2022-2031 | |
| 23 | Armando Alvarado | 3.553 | 2013-2021 | |
| 24 | Tim MacIntyre | 3.565 | 2009-2021 | |
| 25 | Rodrigo Rojas | 3.583 | 1996-2008 | |
| 26 | Matt Drews | 3.593 | 1995-2009 | |
| 27 | Sean Jones | 3.617 | 1996-2010 | |
| 28 | David Fernández | 3.641 | 2010-2017 | |
| 29 | Peter Roop# | 3.647 | 2046-2056 | |
| 30 | Adam Weisgerber | 3.648 | 1995-2004 | |
| 31 | Kenny Kelly# | 3.650 | 2045-2055 | |
| 32 | Sean Bergman | 3.666 | 1995-2008 | |
| 32 | Esteban Madera | 3.666 | 1995-2006 | |
| 34 | Javier Gallegos# | 3.671 | 2047-2058 | |
| 35 | Tom Rivers | 3.689 | 2002-2008 | |
| 36 | Nick Mobley | 3.698 | 2040-2055 | |
| 37 | Rick Clarijs# | 3.716 | 2053-2058 | |
| 38 | Louis Eggleston | 3.719 | 1998-2010 | |
| 39 | Kevin Brodeur | 3.721 | 1995-2006 | |
| 40 | Zachary Paterson# | 3.724 | 2051-2058 | |
| 41 | Elvin Willard | 3.729 | 2010-2017 | |
| 42 | Yun Zhang | 3.733 | 2042-2055 | |
| 43 | Dave Marshall | 3.736 | 2009-2017 | |
| 44 | Roberto Vargas | 3.738 | 2020-2028 | |
| 45 | Juan Gonzáles | 3.739 | 2006-2016 | |
| 46 | Curt Bandelow | 3.740 | 2002-2010 | |
| 47 | Mike Griffin# | 3.751 | 2049-2058 | |
| 48 | Harold Crothers | 3.781 | 1996-2003 | |
| 49 | Juan Ruíz | 3.786 | 2042-2058 | |
| 49 | Andrew Bogan | 3.786 | 1995-2005 | |
| 51 | Justin Lovern | 3.791 | 1997-2008 | |
| 52 | Sherman Clubb | 3.805 | 1996-2007 | |
| 52 | Tony Canales | 3.805 | 2023-2040 | |
| 54 | José Olvera | 3.815 | 2023-2038 | |
| 55 | Diego García | 3.820 | 2026-2036 | |
| 56 | Bobby Wright# | 3.825 | 2050-2058 | |
| 57 | Jeff Clay | 3.826 | 2013-2021 | |
| 58 | Milo Marshall | 3.834 | 2013-2019 | |
| 58 | Scott Mingle | 3.834 | 1996-2004 | |
| 60 | Yves Masson | 3.841 | 2016-2024 | |
| 61 | Richard Jones | 3.842 | 1995-2001 | |
| 62 | Mark Reardon# | 3.844 | 2051-2058 | |
| 63 | Juan Pagán | 3.854 | 2027-2037 | |
| 64 | Cody Lee | 3.855 | 2029-2037 | |
| 65 | David Perea | 3.857 | 2036-2048 | |
| 66 | Eladio Morales | 3.862 | 1995-2002 | |
| 67 | Dean O'Gribben# | 3.863 | 2049-2057 | |
| 68 | César Castro | 3.875 | 2036-2042 | |
| 69 | Yu Vgotmael | 3.881 | 2037-2050 | |
| 70 | Faustino Flores | 3.882 | 1998-2005 | |
| 71 | Andrew Garrison | 3.899 | 2021-2027 | |
| 72 | Sam Lawrence | 3.902 | 2009-2017 | |
| 73 | Steve Hall | 3.909 | 2003-2013 | |
| 74 | Shawn O'Neill | 3.916 | 2016-2022 | |
| 75 | Richard Dallaire | 3.920 | 2020-2028 | |
| 76 | William Smith | 3.923 | 1998-2007 | |
| 77 | Héctor Méndez | 3.927 | 2016-2031 | |
| 78 | Rafael López# | 3.939 | 2045-2056 | |
| 79 | Dae-hyun Kim# | 3.943 | 2045-2055 | |
| 80 | Gill O'Puddin | 3.944 | 2011-2022 | |
| 81 | Brendon Carr | 3.952 | 2034-2048 | |
| 82 | Todd Jones# | 3.961 | 2048-2058 | |
| 83 | Chad Ogea | 3.974 | 1995-2004 | |
| 84 | Pong-su Yu# | 3.975 | 2051-2058 | |
| 85 | Anthony Gustoff | 3.983 | 1995-2011 | |
| 85 | Josh Holt | 3.983 | 2010-2018 | |
| 87 | Pat Hughes | 3.988 | 2002-2007 | |
| 87 | Finley Stabb | 3.988 | 2013-2026 | |
| 89 | Tony Abrams | 3.990 | 2020-2029 | |
| 90 | Charles McGee# | 3.994 | 2047-2057 | |
| 91 | Felipe Méndez | 3.998 | 2042-2051 | |
| 92 | Domingo Campa | 3.999 | 2025-2032 | |
| 93 | Gary McCabe | 4.006 | 2004-2012 | |
| 93 | Luis Valenzuela | 4.006 | 2022-2036 | |
| 95 | Roger Brown | 4.007 | 2019-2031 | |
| 96 | Duncan Winters | 4.012 | 2013-2023 | |
| 96 | Scott Lyon | 4.012 | 2007-2019 | |
| 98 | Christopher Robinson | 4.017 | 2017-2027 | |
| 99 | Mike Rivet# | 4.027 | 2047-2058 | |
| 99 | Javier Bautista | 4.027 | 2024-2032 |
