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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Alan Almond# | 0.686 | 1988-1990 | |
| 2 | Olivier Bigot | 1.038 | 1925-1937 | |
| 3 | Hakeem Ayoob# | 1.080 | 1984-1988 | |
| 4 | Juan Mercado | 1.277 | 1960-1975 | |
| 5 | Emeril Corelli | 1.403 | 1952-1965 | |
| 6 | Resit Edip# | 1.406 | 1979-1986 | |
| 7 | Johnny Downey | 1.464 | 1975-1986 | |
| 8 | Henry Bow | 1.484 | 1933-1939 | |
| 9 | Matthew Dibb | 1.573 | 1973-1984 | |
| 10 | Josh Ventress | 1.636 | 1977-1983 | |
| 11 | Alfredo Pérez# | 1.778 | 1985-1990 | |
| 12 | Uqessun Jumba | 1.846 | 1973-1981 | |
| 13 | Simon Schwer# | 1.853 | 1983-1990 | |
| 14 | Javier Galván* | 1.866 | 1951-1956 | |
| 15 | Fraser MacDuff# | 1.893 | 1974-1988 | |
| 16 | Denzel Heaman | 1.909 | 1971-1974 | |
| 17 | Enrique Gutiérrez# | 1.929 | 1990-1990 | |
| 18 | Michael Steward | 1.939 | 1974-1980 | |
| 19 | Walliyullah Bahir# | 1.983 | 1985-1990 | |
| 20 | Lorenzo Delgado | 2.000 | 1972-1976 | |
| 21 | Sebastian Sewell# | 2.038 | 1984-1989 | |
| 22 | Manlio Carracci | 2.108 | 1966-1983 | |
| 23 | Mario Quintero | 2.113 | 1963-1972 | |
| 24 | Fortunato Giordano* | 2.118 | 1920-1937 | |
| 25 | Elliot Laborde | 2.152 | 1913-1925 | |
| 26 | Rasmus Andreassen* | 2.160 | 1935-1947 | |
| 27 | Bruno Fortin | 2.189 | 1917-1925 | |
| 28 | Kalle Pietilinen | 2.213 | 1979-1987 | |
| 29 | Andy Flowers* | 2.237 | 1966-1975 | |
| 30 | Basz Byczek# | 2.263 | 1980-1988 | |
| 31 | Amid bin Umair | 2.270 | 1973-1985 | |
| 32 | Félix Díaz | 2.314 | 1979-1986 | |
| 33 | Qaraja Badr al Din# | 2.353 | 1984-1990 | |
| 34 | Naganori Muruyama | 2.357 | 1967-1974 | |
| 35 | Algernon Thorne* | 2.361 | 1914-1932 | |
| 36 | Frode Boerkens | 2.368 | 1953-1965 | |
| 37 | Pearson Tuxford* | 2.388 | 1948-1955 | |
| 38 | Julien Hollett | 2.421 | 1970-1981 | |
| 39 | Rod Johnston | 2.439 | 1965-1977 | |
| 40 | Amir Nabih | 2.447 | 1970-1985 | |
| 41 | Owen MacCarlich | 2.455 | 1911-1928 | |
| 41 | Yohanes Solíz# | 2.455 | 1978-1987 | |
| 43 | John Walker | 2.471 | 1915-1926 | |
| 44 | Roland Eissens* | 2.483 | 1925-1937 | |
| 45 | Craig Shopland# | 2.485 | 1986-1990 | |
| 46 | Jim Barnes# | 2.492 | 1986-1990 | |
| 47 | Zak Tompsett | 2.503 | 1921-1932 | |
| 48 | Brett Riley | 2.523 | 1911-1921 | |
| 48 | Yukinaga Takahashi# | 2.523 | 1979-1985 | |
| 50 | Taweel bin Qaraja# | 2.571 | 1977-1987 | |
| 51 | Alexander Wiesner* | 2.613 | 1967-1978 | |
| 52 | Jesús Valentín | 2.621 | 1927-1936 | |
| 53 | Johnny Bedford | 2.643 | 1911-1919 | |
| 54 | Francisco Sánchez# | 2.651 | 1984-1990 | |
| 55 | Tyler Frisby# | 2.659 | 1979-1990 | |
| 56 | Kevin Holmes# | 2.700 | 1982-1989 | |
| 57 | Keo Akamai | 2.723 | 1969-1979 | |
| 58 | Brenden Rodman | 2.743 | 1975-1985 | |
| 59 | Mitchell Thompson* | 2.748 | 1950-1963 | |
| 60 | Finley Baskeyfield | 2.750 | 1958-1971 | |
| 61 | Pedro Espinoza | 2.769 | 1911-1924 | |
| 62 | Vitaly Habitsov | 2.772 | 1966-1981 | |
| 63 | Corey Muhsin# | 2.778 | 1982-1989 | |
| 64 | Pierre Métais | 2.784 | 1943-1955 | |
| 65 | Colm Chantler | 2.795 | 1971-1982 | |
| 66 | Cristian Zausov | 2.804 | 1971-1981 | |
| 67 | Ichiro Yamamoto# | 2.813 | 1986-1990 | |
| 68 | Callum Atholl | 2.842 | 1971-1982 | |
| 69 | Scott Keen# | 2.854 | 1988-1990 | |
| 70 | Roberto Colón# | 2.864 | 1982-1990 | |
| 71 | Rafael Mendoza | 2.870 | 1980-1987 | |
| 72 | Clint Watson | 2.872 | 1927-1935 | |
| 73 | Juan Guerra | 2.874 | 1972-1983 | |
| 74 | Stuart Sandbach | 2.889 | 1944-1950 | |
| 75 | Isma'il bin Dharr | 2.898 | 1969-1975 | |
| 76 | Ĺke Drusse# | 2.914 | 1977-1984 | |
| 77 | Sergio Vásquez | 2.929 | 1973-1981 | |
| 78 | Gordon Branham# | 2.939 | 1977-1986 | |
| 79 | Bobby McLean | 2.941 | 1974-1987 | |
| 80 | Chris Reynolds* | 2.945 | 1916-1940 | |
| 81 | Malik bin Aladdin# | 2.976 | 1987-1990 | |
| 82 | Abdul-Mu'izz Hana# | 3.053 | 1985-1990 | |
| 83 | Harrison Brice | 3.062 | 1911-1915 | |
| 84 | Slobodan Zoric# | 3.065 | 1982-1990 | |
| 85 | Finley Fletcher | 3.079 | 1970-1978 | |
| 86 | Greg van Dam | 3.082 | 1934-1943 | |
| 87 | Jon McClain | 3.092 | 1968-1971 | |
| 88 | Sloan Ide | 3.094 | 1922-1930 | |
| 89 | Christian Dias | 3.107 | 1953-1961 | |
| 90 | Kuemon Sanu | 3.115 | 1946-1954 | |
| 91 | Iemochi Furukawa# | 3.127 | 1978-1990 | |
| 92 | Amin Oluniide# | 3.156 | 1981-1990 | |
| 93 | Chris Bogart* | 3.162 | 1955-1969 | |
| 94 | Sid Stewart | 3.176 | 1930-1943 | |
| 95 | Earnest Tillman | 3.201 | 1939-1956 | |
| 96 | Nadir Asad# | 3.220 | 1977-1988 | |
| 97 | Augusto Soto# | 3.253 | 1980-1990 | |
| 98 | Bengt van der Gaag | 3.261 | 1964-1976 | |
| 99 | Vicente Torres | 3.265 | 1932-1937 | |
| 100 | Mario Ramos | 3.280 | 1966-1972 |
