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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Bob Burton* | 1.942 | 1963-1974 | |
| 2 | Resit Edip# | 2.750 | 1985-1989 | |
| 3 | Alfredo Germán# | 2.874 | 1976-1989 | |
| 4 | Damian Hull | 3.004 | 1963-1968 | |
| 5 | Mauro Chapa | 3.008 | 1954-1969 | |
| 6 | Daniel Adebamgbe | 3.021 | 1974-1988 | |
| 7 | Bart Halsall | 3.024 | 1963-1977 | |
| 8 | Adalgiso Gohmann | 3.030 | 1966-1974 | |
| 8 | León Altagracia | 3.030 | 1962-1969 | |
| 10 | Jorge Chávez | 3.031 | 1978-1989 | |
| 11 | Davy Simmons | 3.045 | 1967-1974 | |
| 12 | Juan Méndez | 3.055 | 1959-1968 | |
| 12 | Bishr Diya al Din | 3.055 | 1973-1977 | |
| 14 | Candramrta Shruti# | 3.062 | 1985-1990 | |
| 15 | Ricardo Morín | 3.073 | 1976-1986 | |
| 16 | Kennan Ready | 3.093 | 1963-1967 | |
| 17 | Okan Basar | 3.095 | 1975-1981 | |
| 18 | Mende Aljeroz# | 3.107 | 1981-1987 | |
| 19 | Roscoe Morin | 3.116 | 1964-1973 | |
| 20 | Orlando Trujillo | 3.145 | 1971-1981 | |
| 21 | Aniq bin Baha al Din | 3.147 | 1975-1987 | |
| 22 | Luis Torres | 3.156 | 1968-1979 | |
| 23 | Roy Evison | 3.159 | 1979-1985 | |
| 24 | Takakazu Ohayashi | 3.172 | 1974-1978 | |
| 25 | Rahimat bin Fareed | 3.183 | 1981-1987 | |
| 26 | Lorenzo Espinoza | 3.184 | 1972-1980 | |
| 27 | Oscar Prudom | 3.188 | 1960-1973 | |
| 28 | Bill López | 3.193 | 1959-1969 | |
| 29 | Pedro García | 3.196 | 1967-1973 | |
| 30 | Tong-yeop Nae | 3.203 | 1966-1977 | |
| 31 | Sergio Díaz | 3.220 | 1979-1985 | |
| 32 | David Widhoezl# | 3.255 | 1982-1989 | |
| 33 | Luis Manuel Vélez | 3.273 | 1954-1974 | |
| 34 | Alexandre Coulon | 3.307 | 1959-1967 | |
| 35 | Clive Mackley | 3.313 | 1956-1968 | |
| 36 | Waldemar Abbeel | 3.327 | 1983-1990 | |
| 36 | Dan Brooks* | 3.327 | 1935-1949 | |
| 38 | Alonso García | 3.328 | 1961-1977 | |
| 39 | Pablo Peńa | 3.332 | 1963-1976 | |
| 40 | Ernesto Colomo | 3.333 | 1973-1978 | |
| 41 | Sean Burke | 3.338 | 1950-1962 | |
| 42 | Mason Kemball | 3.345 | 1929-1941 | |
| 43 | Gordon Zorn | 3.346 | 1961-1972 | |
| 44 | Donald Maxwell | 3.350 | 1978-1987 | |
| 45 | Jesús Vázquez | 3.357 | 1953-1965 | |
| 46 | Manuel Torres | 3.370 | 1940-1951 | |
| 47 | Nadir Asad# | 3.380 | 1982-1989 | |
| 48 | Matthaus Rueckl | 3.384 | 1982-1987 | |
| 48 | Richard Dawson | 3.384 | 1952-1969 | |
| 50 | George Triska | 3.420 | 1949-1960 | |
| 51 | Gael Stares | 3.435 | 1944-1957 | |
| 52 | Mitsunari Sato | 3.439 | 1969-1980 | |
| 53 | Armando Velázquez | 3.458 | 1961-1973 | |
| 54 | Miguel Angel Gutiérrez | 3.462 | 1976-1986 | |
| 55 | Sozen Miyake | 3.469 | 1941-1953 | |
| 55 | Baskin Upham | 3.469 | 1961-1969 | |
| 57 | Jesús Archuleta | 3.472 | 1977-1984 | |
| 58 | Samuel Jackson | 3.480 | 1960-1965 | |
| 59 | Chris Morris | 3.482 | 1977-1984 | |
| 60 | Daryl Channing | 3.488 | 1981-1990 | |
| 61 | George Kinch | 3.491 | 1979-1984 | |
| 62 | Ewan Handford | 3.494 | 1973-1977 | |
| 63 | Cristóbal Cantú | 3.496 | 1972-1983 | |
| 64 | Virgile Valli# | 3.506 | 1979-1990 | |
| 65 | Mike Vidito | 3.508 | 1932-1947 | |
| 65 | Luis Mata | 3.508 | 1968-1981 | |
| 67 | Onel Esperenzilla | 3.509 | 1956-1969 | |
| 68 | Joshua Buller | 3.513 | 1958-1969 | |
| 69 | Rubén Martínez | 3.515 | 1969-1980 | |
| 70 | Stewart Carter | 3.521 | 1965-1974 | |
| 71 | Igor Gabidullin | 3.522 | 1975-1989 | |
| 72 | Ignazio Barbiusa | 3.532 | 1960-1965 | |
| 73 | Rafael Serrano | 3.538 | 1980-1987 | |
| 74 | Martín Villa | 3.559 | 1976-1986 | |
| 75 | Tad Demer | 3.564 | 1977-1990 | |
| 76 | Numair Abdul-Mujib | 3.567 | 1982-1987 | |
| 77 | Sebastian Niculescu | 3.568 | 1974-1982 | |
| 77 | Vincent Gaubert | 3.568 | 1959-1969 | |
| 79 | Eli Lönnberg | 3.573 | 1950-1961 | |
| 80 | Bob Fish | 3.575 | 1977-1988 | |
| 81 | Fatin Nadhir | 3.585 | 1980-1987 | |
| 82 | Charles Autry | 3.591 | 1968-1977 | |
| 83 | Billy Atkinson | 3.610 | 1982-1989 | |
| 84 | Anastasio Álvarez# | 3.617 | 1981-1987 | |
| 85 | Joe Fournier | 3.628 | 1972-1979 | |
| 86 | Farid bin Nawaf | 3.653 | 1978-1985 | |
| 87 | César González | 3.654 | 1950-1963 | |
| 88 | Joe Olson | 3.661 | 1965-1978 | |
| 89 | Jun Yoshikawa | 3.668 | 1943-1958 | |
| 90 | Jason Wyatt | 3.673 | 1975-1982 | |
| 91 | Cole White | 3.680 | 1973-1982 | |
| 92 | Kunimichi Kumatani | 3.689 | 1929-1937 | |
| 93 | Roberto Ruíz | 3.692 | 1933-1941 | |
| 93 | Noah Widdrington | 3.692 | 1967-1979 | |
| 95 | Bill Knapp | 3.695 | 1981-1987 | |
| 96 | Quan Li | 3.702 | 1973-1981 | |
| 97 | Barry Roy | 3.703 | 1929-1948 | |
| 98 | Sebastian Tyley | 3.714 | 1967-1980 | |
| 99 | Rafiq bin Wadi | 3.734 | 1976-1988 | |
| 100 | Grigory Agafonoff | 3.736 | 1979-1987 |
