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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Edgardo Morán | 0.865 | 1999 | |
| 2 | Rick Wells | 0.879 | 2001 | |
| 3 | Sandy Mallandaine# | 0.922 | 2057 | |
| 4 | Gernot Frece# | 0.952 | 2051 | |
| 5 | Leonard Puckett | 0.954 | 2006 | |
| 6 | Anthony Brown | 0.955 | 2007 | |
| 7 | Pete Hulett# | 0.960 | 2055 | |
| 8 | Johnny Carr# | 0.964 | 2057 | |
| 9 | Júlio Gonzáles | 1.023 | 2040 | |
| 10 | Rafael Cuestas | 1.032 | 2006 | |
| 11 | Archie Cartwright | 1.035 | 2005 | |
| 11 | Archie Cartwright | 1.035 | 2004 | |
| 13 | Alejandro Cruz | 1.083 | 2052 | |
| 14 | Dave Whittier | 1.085 | 2036 | |
| 15 | Phil Rose | 1.102 | 2023 | |
| 16 | Loan Duval# | 1.110 | 2054 | |
| 17 | Virgile Ardizzone | 1.136 | 2039 | |
| 18 | Carlos Zalvidea | 1.139 | 2004 | |
| 19 | Zhuo-cheng Hsia | 1.160 | 2039 | |
| 20 | Lawrence Forest# | 1.184 | 2058 | |
| 21 | Álex León# | 1.190 | 2054 | |
| 22 | Leonard Puckett | 1.191 | 2004 | |
| 23 | Nick Rivers# | 1.202 | 2053 | |
| 24 | Raúl Vásquez | 1.219 | 2041 | |
| 25 | Juan García | 1.243 | 1997 | |
| 26 | Tomás Valdéz | 1.248 | 2006 | |
| 27 | Bob Blaisdell | 1.266 | 2000 | |
| 27 | Sam Druff# | 1.266 | 2051 | |
| 29 | Woody Adams | 1.274 | 2007 | |
| 30 | Tom Sharp | 1.286 | 1998 | |
| 31 | Jesús Martínez | 1.292 | 2044 | |
| 31 | David Mazariegos | 1.292 | 2011 | |
| 33 | Brian Meister | 1.303 | 1998 | |
| 34 | Brent Lindsey | 1.320 | 2001 | |
| 35 | José Bermúdez | 1.322 | 2023 | |
| 36 | Mark Livingston | 1.355 | 2008 | |
| 37 | Lawrence Hutchison | 1.359 | 2010 | |
| 38 | Kreshnik Bizi# | 1.361 | 2057 | |
| 39 | Paul Hales | 1.375 | 1998 | |
| 39 | Alfonso Cruz | 1.375 | 2039 | |
| 39 | Mike Bragg | 1.375 | 2035 | |
| 42 | António Santos | 1.382 | 2008 | |
| 43 | Jim Hill | 1.385 | 2006 | |
| 44 | Matt Keller | 1.387 | 2016 | |
| 45 | Augusto Román | 1.390 | 2027 | |
| 46 | Lenya Nikushkin# | 1.394 | 2058 | |
| 47 | Alfredo Sánchez | 1.414 | 2038 | |
| 47 | Martin Villa | 1.414 | 2052 | |
| 49 | António Ayala | 1.415 | 2017 | |
| 50 | Miklas Wils | 1.421 | 2036 | |
| 51 | Héctor Delgado# | 1.432 | 2055 | |
| 52 | Donald Harris | 1.439 | 2001 | |
| 53 | Ricardo Soriano | 1.462 | 2010 | |
| 54 | Alejandro Cruz | 1.466 | 2051 | |
| 55 | Júlio Madrigal | 1.473 | 2035 | |
| 56 | Alberto Leal | 1.481 | 2035 | |
| 57 | Ciro Caredda | 1.492 | 2002 | |
| 58 | José Leyva | 1.495 | 2009 | |
| 59 | Juan Pérez | 1.500 | 2040 | |
| 60 | Takashi Yamamoto# | 1.519 | 2057 | |
| 61 | Guillermo Sánchez | 1.521 | 2038 | |
| 62 | Oliver Villegas | 1.528 | 2037 | |
| 63 | Keizo Kaneko | 1.543 | 2040 | |
| 64 | Vincente Medrano | 1.546 | 2035 | |
| 65 | António Rodríguez | 1.548 | 2039 | |
| 66 | Glenn Hargrove# | 1.552 | 2053 | |
| 67 | Wally Leonard | 1.553 | 2013 | |
| 68 | Endres Kümblin# | 1.556 | 2055 | |
| 69 | Calvin Meyer | 1.571 | 2002 | |
| 70 | Quintin Birss# | 1.574 | 2052 | |
| 71 | Johnny Ginn | 1.580 | 1998 | |
| 72 | Brian Whitford# | 1.584 | 2056 | |
| 73 | Alan Hucknall | 1.588 | 2004 | |
| 73 | Jim Davis | 1.588 | 2011 | |
| 73 | Jeremy Crawford | 1.588 | 2048 | |
| 76 | Cipriano Morales# | 1.595 | 2054 | |
| 77 | Bruce Lund | 1.599 | 1998 | |
| 77 | Vincente Venalde | 1.599 | 2039 | |
| 79 | Vicente Méndez | 1.601 | 2038 | |
| 80 | Pedro Costello | 1.602 | 2039 | |
| 80 | Cliff Sweeny | 1.602 | 2000 | |
| 82 | Clayton O'Donnell | 1.608 | 2010 | |
| 83 | Calvin Meyer | 1.609 | 2008 | |
| 84 | Michael Myrie | 1.613 | 1998 | |
| 85 | Carlos Ramírez | 1.614 | 2022 | |
| 86 | Vincente Hernández# | 1.615 | 2058 | |
| 87 | Chet West | 1.618 | 2009 | |
| 88 | José Barajas | 1.620 | 2003 | |
| 89 | Bob Bartlett | 1.622 | 2035 | |
| 90 | Marcos Márquez | 1.634 | 2024 | |
| 91 | Mario Martínez# | 1.636 | 2056 | |
| 92 | Carlos Rivera | 1.643 | 2027 | |
| 93 | Fernando Álvarez | 1.651 | 2007 | |
| 93 | Ralph Leslie | 1.651 | 1999 | |
| 93 | Ichizo Taguchi# | 1.651 | 2057 | |
| 96 | Walter Smith | 1.653 | 2040 | |
| 97 | Edmond Thomas# | 1.667 | 2051 | |
| 98 | Alex Pulley | 1.674 | 2005 | |
| 99 | José Martínez | 1.676 | 2016 | |
| 100 | Roberto López | 1.681 | 2016 |
