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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | David Ware | 2.025 | 1918 | |
| 2 | Tommy Hayes | 2.081 | 1942 | |
| 3 | Roy Musial | 2.086 | 1919 | |
| 4 | Joe Sanders | 2.158 | 1918 | |
| 5 | Nathan Allison# | 2.183 | 1979 | |
| 6 | Juan Martínez | 2.221 | 1918 | |
| 7 | Carlos Martínez | 2.250 | 1941 | |
| 8 | Yorikane Tsuji | 2.266 | 1963 | |
| 9 | Doug Lawrence | 2.278 | 1919 | |
| 10 | Jérémy Bertrand# | 2.358 | 1981 | |
| 11 | Andrew Madison | 2.471 | 1913 | |
| 12 | Jaime Montáñez | 2.478 | 1943 | |
| 13 | Rafael Morales | 2.481 | 1927 | |
| 14 | Ricardo Gómez | 2.510 | 1943 | |
| 15 | José Ramos | 2.515 | 1941 | |
| 16 | Danilo Felitti | 2.519 | 1963 | |
| 17 | Loflinger Arrau | 2.550 | 1938 | |
| 18 | Donny McKieson | 2.558 | 1935 | |
| 19 | Ricardo Ransom | 2.571 | 1918 | |
| 20 | Alonso González | 2.665 | 1920 | |
| 21 | Kieran Bicknell | 2.712 | 1963 | |
| 22 | Joep de Vlaming | 2.726 | 1938 | |
| 23 | Milkesh Thommana | 2.738 | 1976 | |
| 24 | Gerald Gallon | 2.771 | 1946 | |
| 25 | Paul Chamberlain | 2.773 | 1918 | |
| 26 | Arturo Martínez | 2.781 | 1945 | |
| 27 | Leonardo Zaragoza | 2.790 | 1920 | |
| 28 | José Amador | 2.808 | 1918 | |
| 29 | Valentín López | 2.817 | 1918 | |
| 30 | Chris Sims | 2.835 | 1926 | |
| 31 | Rafael Ortíz | 2.838 | 1918 | |
| 32 | Josh Weeks | 2.852 | 1912 | |
| 32 | Rob Snow | 2.852 | 1926 | |
| 34 | Jorge Tobías | 2.885 | 1919 | |
| 35 | Jimmy Lamb | 2.889 | 1942 | |
| 36 | Ángel Lombos | 2.894 | 1922 | |
| 37 | Tommy Davis | 2.900 | 1970 | |
| 38 | Edgardo Rivera | 2.903 | 1928 | |
| 39 | Octávio Capinho | 2.913 | 1940 | |
| 39 | Daniel Brooks | 2.913 | 1942 | |
| 41 | Bill Hansen | 2.916 | 1918 | |
| 42 | Brian O'Connor | 2.927 | 1938 | |
| 43 | Andre Weaver | 2.928 | 1929 | |
| 44 | Elwood Walker | 2.935 | 1969 | |
| 45 | Javier Rivera | 2.950 | 1930 | |
| 46 | Matt Lambert | 2.957 | 1928 | |
| 46 | Paul Bray | 2.957 | 1942 | |
| 48 | Pat Egglestone | 2.966 | 1940 | |
| 49 | Júlio Vélez# | 2.972 | 1976 | |
| 50 | Doug Blackwell | 2.982 | 1967 | |
| 51 | Ángel Díaz | 2.993 | 1931 | |
| 52 | Francisco Espinoza | 2.996 | 1940 | |
| 53 | Augusto Rivera | 3.005 | 1919 | |
| 54 | Armando Márquez | 3.013 | 1965 | |
| 55 | Domingo Fajardo | 3.021 | 1931 | |
| 56 | Franck de Jager | 3.030 | 1980 | |
| 57 | Bert Martyn | 3.038 | 1928 | |
| 58 | Alex Moran | 3.040 | 1912 | |
| 59 | Javier Rivas | 3.046 | 1919 | |
| 59 | Hang-ki Zhang | 3.046 | 1939 | |
| 61 | Jorge Garza | 3.056 | 1919 | |
| 62 | Orlando Trujillo | 3.060 | 1963 | |
| 63 | Ramón Rodríguez | 3.098 | 1940 | |
| 63 | Pedro García | 3.098 | 1960 | |
| 65 | César Negrón | 3.111 | 1912 | |
| 66 | César Valle# | 3.122 | 1984 | |
| 66 | Jeff Robertson# | 3.122 | 1981 | |
| 68 | Grant Beals | 3.125 | 1934 | |
| 69 | Cary Hubbard | 3.133 | 1915 | |
| 70 | Anastasio Ortíz | 3.141 | 1970 | |
| 71 | Terry Ward | 3.143 | 1913 | |
| 72 | Terry Ward | 3.169 | 1914 | |
| 73 | Ryuichi Aoki | 3.173 | 1932 | |
| 74 | Barney Sherman | 3.183 | 1963 | |
| 74 | Brad Reynolds | 3.183 | 1927 | |
| 76 | Bill White | 3.188 | 1941 | |
| 77 | William Wakeford | 3.190 | 1920 | |
| 77 | Ricardo Parrao | 3.190 | 1971 | |
| 79 | Charlie Harmon | 3.198 | 1927 | |
| 80 | Jorge Pagán | 3.202 | 1970 | |
| 81 | Robert Carroll# | 3.207 | 1988 | |
| 81 | Ed Ritter# | 3.207 | 1988 | |
| 83 | Josh Jenkins | 3.213 | 1919 | |
| 84 | Bill Rose | 3.218 | 1918 | |
| 85 | Luke Johnson | 3.221 | 1943 | |
| 86 | Gerald Gallon | 3.222 | 1945 | |
| 87 | Ryuichi Honda | 3.225 | 1959 | |
| 88 | David Vega | 3.235 | 1918 | |
| 89 | Ben Bowen | 3.237 | 1935 | |
| 90 | Álex Aguilera | 3.252 | 1976 | |
| 91 | Jason Wyatt | 3.254 | 1972 | |
| 92 | Abelard Knippschild | 3.256 | 1945 | |
| 93 | Miguel Torres | 3.261 | 1939 | |
| 94 | Bill Rose | 3.263 | 1919 | |
| 95 | Motoyasu Chikafuji | 3.265 | 1918 | |
| 96 | León Altagracia | 3.273 | 1958 | |
| 97 | Stan Robertson | 3.275 | 1924 | |
| 98 | Aaron Jones | 3.284 | 1942 | |
| 99 | William Wooten | 3.291 | 1927 | |
| 100 | Anthony Bryant* | 3.295 | 1932 |
