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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Tony Simmons* | 1.953 | 2033-2051 | |
| 2 | Patrick Guilfolly* | 2.017 | 2034-2051 | |
| 3 | Salvador Ibarra* | 2.089 | 2040-2058 | |
| 4 | Cy Young* | 2.180 | 1899-1910 | |
| 5 | Babe Ruth* | 2.193 | 1914-1919 | |
| 6 | Vic Willis* | 2.272 | 1906-1910 | |
| 7 | Ernesto Matos* | 2.316 | 2035-2052 | |
| 8 | Pete Alexander* | 2.375 | 1911-1930 | |
| 9 | Tony Paylor* | 2.378 | 2035-2049 | |
| 10 | Luis Barcelo* | 2.413 | 2018-2034 | |
| 11 | Pedro Martinez* | 2.435 | 1992-2009 | |
| 12 | Mariano Rivera | 2.503 | 1995-2007 | |
| 13 | Alex Daniels# | 2.552 | 2053-2066 | |
| 14 | Juan Soto | 2.560 | 2036-2056 | |
| 15 | Raúl Alvarado* | 2.569 | 2029-2050 | |
| 16 | Mark Prior* | 2.574 | 2002-2019 | |
| 17 | António Flores | 2.592 | 2038-2046 | |
| 18 | Hoyt Wilhelm* | 2.607 | 1957-1971 | |
| 19 | Scott Holcomb | 2.635 | 2041-2060 | |
| 20 | Thomas Diamond* | 2.639 | 2008-2021 | |
| 21 | Ernesto Nava# | 2.656 | 2055-2066 | |
| 22 | Viriato Malh* | 2.660 | 2036-2055 | |
| 23 | Samuel Rainey* | 2.686 | 2020-2039 | |
| 24 | Corey McDonald* | 2.687 | 2031-2052 | |
| 25 | Greg Miller* | 2.692 | 2006-2023 | |
| 26 | Luis Ramirez | 2.733 | 2018-2034 | |
| 27 | Naizen Takaki | 2.738 | 2043-2058 | |
| 28 | José Álvarez# | 2.761 | 2046-2066 | |
| 29 | Edwin Jackson* | 2.773 | 2003-2022 | |
| 30 | Alan Walker# | 2.774 | 2055-2066 | |
| 31 | Dan Spence# | 2.787 | 2055-2066 | |
| 32 | Stan Coveleski* | 2.802 | 1916-1924 | |
| 33 | John Franco | 2.823 | 1984-2004 | |
| 34 | Rollie Fingers* | 2.831 | 1968-1985 | |
| 35 | Jim Palmer* | 2.856 | 1965-1984 | |
| 36 | Héctor Acevedo | 2.870 | 2043-2061 | |
| 37 | Jesse Bashaw# | 2.880 | 2050-2066 | |
| 38 | Louis-Félix Roy# | 2.892 | 2052-2066 | |
| 39 | Irwin Spears* | 2.895 | 2034-2056 | |
| 40 | Henry Hill# | 2.897 | 2053-2066 | |
| 41 | Neill Oulton* | 2.901 | 2038-2054 | |
| 42 | Bob Gibson | 2.914 | 1959-1975 | |
| 43 | Greg Maddux* | 2.941 | 1986-2004 | |
| 44 | Manuel González* | 2.973 | 2039-2053 | |
| 45 | Carl Smith | 2.989 | 2048-2054 | |
| 46 | Dizzy Dean* | 2.990 | 1930-1937 | |
| 47 | Ronald Holland# | 2.995 | 2047-2066 | |
| 48 | Scott Fitzpatrick | 2.996 | 2038-2060 | |
| 49 | Alex Gibbs | 3.007 | 2046-2059 | |
| 50 | Juan Rodríguez | 3.049 | 2044-2063 | |
| 51 | Lyndon Badger# | 3.051 | 2047-2066 | |
| 52 | Hal Newhouser* | 3.055 | 1939-1955 | |
| 53 | Rueben Litten* | 3.062 | 2018-2036 | |
| 54 | Chris Ashling# | 3.064 | 2056-2066 | |
| 55 | Jack Chesbro* | 3.066 | 1899-1909 | |
| 56 | Mo-ruo Fang# | 3.072 | 2054-2066 | |
| 57 | Pud Galvin* | 3.085 | 1886-1892 | |
| 58 | Paco Martínez | 3.086 | 2042-2053 | |
| 59 | Jesse Orosco | 3.092 | 1979-2003 | |
| 60 | Alfredo Perez* | 3.101 | 2012-2037 | |
| 61 | Jose Valverde | 3.107 | 2003-2016 | |
| 62 | Greg Hill* | 3.113 | 2037-2056 | |
| 63 | Roland Noyola* | 3.115 | 2009-2027 | |
| 64 | Gaylord Perry* | 3.122 | 1972-1982 | |
| 65 | Catfish Hunter* | 3.126 | 1965-1974 | |
| 66 | Gerald Donaldson* | 3.133 | 2010-2029 | |
| 67 | Eric Gagne | 3.136 | 1999-2015 | |
| 67 | Randy Johnson* | 3.136 | 1989-2006 | |
| 69 | Antonio Reno* | 3.138 | 2009-2024 | |
| 70 | Tyree Beckwith* | 3.145 | 2007-2024 | |
| 71 | Nolan Ryan* | 3.147 | 1980-1991 | |
| 72 | Eppa Rixey* | 3.148 | 1912-1933 | |
| 73 | Steve Carlton* | 3.149 | 1965-1988 | |
| 74 | Brandon League | 3.157 | 2006-2021 | |
| 75 | Terry Jara | 3.159 | 2024-2039 | |
| 75 | Rodney Dempsey | 3.159 | 2030-2045 | |
| 77 | Brody Anderson# | 3.172 | 2053-2066 | |
| 78 | Donald Reese | 3.184 | 2044-2060 | |
| 79 | Doug Bennett | 3.191 | 2042-2061 | |
| 80 | Shan-tang Gan# | 3.199 | 2056-2066 | |
| 81 | Ernest Carney | 3.204 | 2050-2063 | |
| 82 | Trevor Hoffman | 3.210 | 1993-2008 | |
| 83 | Alfred Fellers* | 3.212 | 2009-2027 | |
| 84 | Stanley Desimone# | 3.220 | 2052-2066 | |
| 85 | Desmond Greenwood | 3.225 | 2045-2061 | |
| 86 | Joseph McLaughlin* | 3.231 | 2016-2030 | |
| 87 | Burleigh Grimes* | 3.233 | 1916-1931 | |
| 88 | Bob Lemon* | 3.235 | 1946-1958 | |
| 89 | J.D. Durbin | 3.239 | 2007-2019 | |
| 90 | Early Wynn* | 3.241 | 1949-1963 | |
| 91 | Jim Bunning* | 3.245 | 1955-1971 | |
| 92 | Bert Blyleven | 3.246 | 1970-1988 | |
| 93 | Doug Jones | 3.251 | 1982-2000 | |
| 94 | Bob Feller* | 3.254 | 1936-1956 | |
| 95 | Barney Doyle | 3.258 | 2037-2052 | |
| 96 | Keith Foulke | 3.259 | 1997-2008 | |
| 97 | Emílio Mendoza# | 3.260 | 2055-2066 | |
| 98 | Robb Nen | 3.268 | 1993-2005 | |
| 99 | William Pero | 3.269 | 2013-2030 | |
| 99 | Thad Morris | 3.269 | 2012-2027 |
