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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Lucas Ledgerwood# | 0.818 | 2047 | |
| 2 | Nathan Hardy# | 0.871 | 2047 | |
| 3 | Goldofrede Romero | 0.879 | 2006 | |
| 4 | Emerson Castillo# | 0.915 | 2050 | |
| 5 | Ben Maier | 1.017 | 2009 | |
| 6 | Roger McBride | 1.019 | 2006 | |
| 7 | Victor Gomez | 1.023 | 2027 | |
| 8 | Owen Howard | 1.054 | 2034 | |
| 9 | Rob Busch | 1.120 | 2004 | |
| 9 | Troy Pelton | 1.120 | 2004 | |
| 9 | Gerardo Solis | 1.120 | 2005 | |
| 12 | Nick Levinson# | 1.125 | 2048 | |
| 12 | Ramon Beltran | 1.125 | 2017 | |
| 14 | Adam McEntee | 1.181 | 2004 | |
| 15 | Nate Escalante# | 1.227 | 2050 | |
| 16 | Alfredo Hoyos | 1.249 | 2008 | |
| 17 | Adrian Stuhlman | 1.297 | 2022 | |
| 18 | Zane Goettl# | 1.303 | 2034 | |
| 18 | Colton Testerman | 1.303 | 2035 | |
| 20 | Dwight N'Diaye# | 1.314 | 2050 | |
| 21 | Llewellyn Choy# | 1.317 | 2042 | |
| 22 | Tenji Glasson | 1.320 | 2004 | |
| 23 | Jose Margaglio | 1.333 | 2009 | |
| 24 | Harry Marshall | 1.362 | 2038 | |
| 25 | Bill McGee | 1.369 | 2028 | |
| 26 | Matt Fisher | 1.373 | 2006 | |
| 27 | David Martin | 1.380 | 2023 | |
| 28 | Ashley Gauthier | 1.388 | 2033 | |
| 29 | Willie Cruz | 1.394 | 2011 | |
| 30 | Travis Holt | 1.397 | 2013 | |
| 31 | Tony Morales | 1.401 | 2029 | |
| 32 | Rudy Samson | 1.427 | 2009 | |
| 33 | Jools Anthony# | 1.434 | 2050 | |
| 34 | Mike Groves | 1.439 | 2007 | |
| 34 | Yasiel Vargas | 1.439 | 2034 | |
| 36 | Zach Holst# | 1.444 | 2046 | |
| 37 | Pedro Fuentes | 1.462 | 2025 | |
| 38 | Daniel Aguilera | 1.469 | 2005 | |
| 39 | John Clukey | 1.475 | 2004 | |
| 40 | Benito Aguayo | 1.481 | 2010 | |
| 40 | Dawson Deese# | 1.481 | 2045 | |
| 42 | Valentín Gutiérrez | 1.487 | 2032 | |
| 43 | Victor Delgado | 1.494 | 2018 | |
| 44 | Brad Shannon | 1.506 | 2013 | |
| 44 | Benedict Da Silva# | 1.506 | 2049 | |
| 46 | Zach Merrifield# | 1.527 | 2048 | |
| 47 | Ramón Carrasco | 1.528 | 2037 | |
| 48 | Dave Haynes | 1.536 | 2019 | |
| 49 | Shigeyasu Sato | 1.543 | 2014 | |
| 49 | Nick Brown | 1.543 | 2017 | |
| 49 | Juan Ramos | 1.543 | 2004 | |
| 52 | Nathaniel Conder# | 1.554 | 2044 | |
| 53 | Rowan Childers# | 1.561 | 2045 | |
| 54 | Shuwen Wang | 1.564 | 2036 | |
| 54 | Albertin Estrada | 1.564 | 2033 | |
| 56 | Rico Santos | 1.575 | 2042 | |
| 57 | Jaime Barrios | 1.582 | 2036 | |
| 58 | Victor Curiel | 1.588 | 2034 | |
| 58 | Billy Sato | 1.588 | 2006 | |
| 60 | Jason Murphy | 1.607 | 2006 | |
| 61 | Alfredo Tavarez | 1.609 | 2021 | |
| 62 | Muhamet Peco | 1.610 | 2005 | |
| 63 | Cody Middleton | 1.615 | 2033 | |
| 64 | Josh Corpening | 1.618 | 2006 | |
| 65 | Vince Ulrich | 1.622 | 2008 | |
| 66 | Damian Palacios | 1.629 | 2016 | |
| 67 | Kyle Bryan | 1.631 | 2006 | |
| 68 | Trevon Glanton# | 1.640 | 2042 | |
| 68 | Jeremy Alles | 1.640 | 2012 | |
| 70 | Francisco Bocanegra | 1.656 | 2010 | |
| 71 | Bill Kiggans | 1.667 | 2006 | |
| 72 | Blair Ross | 1.673 | 2035 | |
| 73 | Jose Flores | 1.680 | 2028 | |
| 74 | Ty Richardson | 1.688 | 2049 | |
| 74 | Bob Petersen | 1.688 | 2018 | |
| 74 | Jim Stoddard | 1.688 | 2018 | |
| 77 | Gonzalo Agosto | 1.703 | 2047 | |
| 78 | Albin Mertes# | 1.708 | 2045 | |
| 79 | Elijah Bolden | 1.713 | 2008 | |
| 80 | Mike Diaz | 1.716 | 2009 | |
| 81 | Jeff Cleveland | 1.723 | 2008 | |
| 82 | Hébo Moreno | 1.726 | 2035 | |
| 83 | Elias Pearce | 1.738 | 2031 | |
| 83 | Gavin Hollenbeck# | 1.738 | 2050 | |
| 85 | Juan Machudo | 1.745 | 2006 | |
| 86 | Tommie McFarland | 1.749 | 2004 | |
| 87 | Tim Post | 1.761 | 2029 | |
| 87 | Elias Rosas | 1.761 | 2011 | |
| 89 | Frank Szalai# | 1.765 | 2049 | |
| 90 | Jim Rusch | 1.769 | 2022 | |
| 91 | Thomas Ash | 1.770 | 2033 | |
| 91 | Incendio Godoy | 1.770 | 2004 | |
| 93 | Brandon Barnett# | 1.774 | 2050 | |
| 94 | Alex Carlton | 1.778 | 2013 | |
| 95 | Bobby Tamburini | 1.779 | 2004 | |
| 96 | Cooper Maloney# | 1.786 | 2035 | |
| 97 | Ashton Checchio | 1.787 | 2040 | |
| 98 | Manuelo Menendez | 1.792 | 2032 | |
| 99 | Sean Frankland | 1.793 | 2011 | |
| 100 | Gabe Myers | 1.800 | 2020 |
