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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Alvin Pitts | 2.220 | 2025-2035 | |
| 2 | Lawrence Boulter | 2.284 | 2018-2031 | |
| 3 | Tim Primmer | 2.498 | 2051-2057 | |
| 4 | Lúcio Olvera | 2.523 | 2017-2030 | |
| 5 | Joseph Grieco | 2.563 | 2051-2057 | |
| 6 | Austin Upham | 2.608 | 2020-2027 | |
| 7 | Don Raynor | 2.690 | 2012-2017 | |
| 8 | Edgardo Mendoza | 2.721 | 2030-2043 | |
| 9 | Danny Veras | 2.733 | 2053-2060 | |
| 10 | Burl Delaney | 2.913 | 2045-2054 | |
| 11 | Octávio Rodríguez | 2.943 | 2028-2044 | |
| 12 | Puck de Gast | 3.001 | 2046-2052 | |
| 13 | José Reyna | 3.045 | 2043-2049 | |
| 14 | Monty Viadana# | 3.071 | 2057-2061 | |
| 15 | Cédrik Vézina | 3.078 | 2045-2051 | |
| 16 | Pat Foster | 3.132 | 2007-2016 | |
| 17 | Ernie Eggins | 3.149 | 2033-2046 | |
| 18 | Don Flowers | 3.152 | 2040-2049 | |
| 19 | Ippolito Ghezzi | 3.161 | 2047-2057 | |
| 20 | Finley Taylor | 3.169 | 2056-2063 | |
| 21 | Bobby Makeever | 3.170 | 2047-2054 | |
| 22 | Paddy Sier | 3.171 | 2043-2051 | |
| 23 | Youp Boelens | 3.192 | 2052-2061 | |
| 24 | Bob Hines | 3.223 | 2038-2045 | |
| 25 | Ramón Martínez | 3.242 | 2048-2057 | |
| 25 | Salvador Rosas | 3.242 | 2022-2030 | |
| 27 | Charles Tatum | 3.270 | 2033-2038 | |
| 28 | Martin Reed | 3.303 | 2005-2011 | |
| 29 | Kenny Collier | 3.325 | 2018-2024 | |
| 30 | Konrad Bolt | 3.329 | 2051-2060 | |
| 31 | Herb Warner | 3.379 | 2038-2044 | |
| 32 | Feitze Spruijt | 3.384 | 2044-2051 | |
| 33 | Pedro Padilla | 3.386 | 2030-2038 | |
| 34 | Jesús Rodríguez | 3.390 | 1990-1994 | |
| 35 | Ted Henry | 3.397 | 2038-2044 | |
| 36 | Bob Gordon | 3.399 | 1990-1999 | |
| 37 | Alan Hilton | 3.421 | 2007-2011 | |
| 38 | Bartolo Fernández | 3.466 | 2018-2023 | |
| 39 | Walt Bruce | 3.486 | 2013-2017 | |
| 40 | Paul Davis | 3.501 | 2043-2049 | |
| 41 | Paul Pushak | 3.511 | 2046-2053 | |
| 42 | Nate Potter | 3.512 | 2003-2017 | |
| 43 | Ron Hunt | 3.514 | 2005-2012 | |
| 44 | Morgan Johnson | 3.518 | 2032-2038 | |
| 45 | Alejandro Fuentes | 3.524 | 2034-2040 | |
| 46 | Kyle Hargrove | 3.526 | 2034-2040 | |
| 47 | Anthony Henderson | 3.532 | 2006-2012 | |
| 48 | Jeffery Shirley | 3.545 | 2037-2043 | |
| 49 | Felix Silva | 3.575 | 2062-2066 | |
| 50 | Pedro Villalobos | 3.599 | 2031-2038 | |
| 51 | Bob Riley | 3.619 | 2006-2017 | |
| 52 | Rusty Goodwin | 3.626 | 2031-2040 | |
| 53 | Jorge Cabrera | 3.644 | 2004-2010 | |
| 54 | Jesus Ayala | 3.669 | 2053-2061 | |
| 54 | Iván Rojas | 3.669 | 2020-2026 | |
| 56 | Martin Murphy | 3.670 | 1990-1994 | |
| 57 | Fernando López | 3.683 | 2005-2011 | |
| 58 | Bill Martin | 3.686 | 2037-2043 | |
| 59 | James Martin | 3.690 | 2011-2018 | |
| 60 | Stanley Hodges | 3.696 | 1992-2000 | |
| 61 | Ángel Correa | 3.702 | 2050-2063 | |
| 62 | Yuri D'Urso | 3.704 | 2040-2047 | |
| 63 | Rafael González | 3.706 | 2047-2052 | |
| 64 | Da-xia Lung | 3.711 | 2047-2053 | |
| 65 | Salvador De Jesús | 3.753 | 2039-2047 | |
| 66 | Francis Marriott | 3.768 | 2060-2066 | |
| 67 | Charles Meyer | 3.771 | 2032-2042 | |
| 68 | Raymond Champagne | 3.794 | 2032-2038 | |
| 69 | Joe Turner | 3.795 | 2016-2026 | |
| 70 | Kento Takahashi | 3.819 | 2052-2063 | |
| 71 | George Gilmore | 3.827 | 1990-1998 | |
| 72 | Mike Whitaker | 3.828 | 1990-1997 | |
| 73 | Vicente Peña | 3.849 | 1990-2000 | |
| 74 | Quincy Anderson | 3.882 | 2035-2041 | |
| 75 | Carl Allan | 3.926 | 2038-2048 | |
| 76 | Samuel Giroux | 3.932 | 2003-2010 | |
| 77 | Dominic Boutin | 3.951 | 2032-2041 | |
| 78 | Johnny Stephens | 3.956 | 2029-2034 | |
| 79 | Chris Bolden | 3.974 | 2003-2011 | |
| 80 | Martin White | 3.990 | 1990-1994 | |
| 81 | Damon Davis | 4.001 | 2018-2029 | |
| 82 | Sergio Montoya | 4.011 | 2033-2041 | |
| 83 | Rodrigo Montoya | 4.045 | 2034-2040 | |
| 84 | Mario Pereira | 4.082 | 2039-2044 | |
| 85 | Robert Tardif | 4.101 | 2029-2035 | |
| 86 | Jorge Trujillo | 4.102 | 2011-2016 | |
| 87 | Vincent Wilson | 4.103 | 1991-1998 | |
| 88 | Francisco Vásquez | 4.122 | 2043-2050 | |
| 89 | Tomás Guerra | 4.175 | 2033-2039 | |
| 90 | Matt Wheat | 4.214 | 2032-2036 | |
| 91 | Jorge Carrillo | 4.287 | 2031-2038 | |
| 92 | Jerry Clark | 4.298 | 2028-2033 | |
| 93 | Darrell Lorton | 4.427 | 2033-2038 | |
| 94 | Ray Williamson | 4.601 | 2028-2034 | |
| 95 | Davey Shannon | 4.790 | 1991-1996 | |
| 96 | Robbie Dunn | 4.893 | 2032-2038 | |
| 97 | John Jordan | 5.089 | 2024-2034 | |
| 98 | Harry Camp | 5.324 | 1996-2007 |
