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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Roberto Guerrero | 2.834 | 1934-1942 | |
| 2 | Luis Moreno | 3.026 | 1933-1937 | |
| 3 | Daryl Wellington | 3.116 | 1964-1974 | |
| 4 | Aaron Wrayford | 3.138 | 1926-1929 | |
| 5 | Montrell Avellino | 3.185 | 1937-1940 | |
| 6 | Paul Stevens | 3.187 | 1918-1921 | |
| 7 | Carlos Cabral | 3.336 | 1926-1929 | |
| 8 | Adrien Castronova | 3.392 | 1927-1933 | |
| 9 | Bolan Routledge | 3.398 | 1944-1954 | |
| 10 | Christophe Neveu | 3.482 | 1939-1950 | |
| 11 | Félix Estrada | 3.546 | 1937-1940 | |
| 12 | Juan Carbajal | 3.606 | 1941-1950 | |
| 13 | Jorge Rincón | 3.628 | 1937-1940 | |
| 14 | Aurelio López | 3.632 | 1941-1945 | |
| 15 | Sabih Najm al Din | 3.686 | 1980-1990 | |
| 16 | Luigi Tillett | 3.814 | 1918-1926 | |
| 17 | Takane Gato | 3.849 | 1927-1934 | |
| 18 | Aksobhya Charu# | 3.871 | 1979-1990 | |
| 19 | Tze-meng Zhai | 3.879 | 1932-1937 | |
| 20 | Jesse Jones | 3.914 | 1960-1969 | |
| 21 | Ludovic Maestoni | 3.916 | 1924-1930 | |
| 22 | Jaska Kirvesniemi | 3.928 | 1968-1974 | |
| 23 | Keith Tremain | 3.980 | 1959-1968 | |
| 24 | Labeeb Labib# | 4.006 | 1978-1990 | |
| 25 | Riemer Steenis | 4.027 | 1937-1940 | |
| 25 | José Orosco | 4.027 | 1944-1950 | |
| 27 | Juan Carlos Cortés | 4.056 | 1931-1934 | |
| 28 | Oskar Prugger | 4.117 | 1930-1936 | |
| 29 | Carlos González | 4.120 | 1927-1932 | |
| 30 | Ulrik Meulengracht | 4.122 | 1930-1934 | |
| 31 | Norm Peck | 4.176 | 1930-1934 | |
| 32 | Jaime Silva | 4.255 | 1970-1983 | |
| 33 | Kieran Kearsey | 4.261 | 1962-1967 | |
| 34 | Birru Kimameta# | 4.271 | 1981-1989 | |
| 35 | Leone Maldini | 4.287 | 1928-1932 | |
| 36 | Graeme Millbank | 4.328 | 1929-1941 | |
| 37 | Michael Bjørnå | 4.516 | 1925-1928 | |
| 38 | François Coste | 4.585 | 1941-1944 | |
| 39 | Dieter Wurfel | 4.597 | 1980-1989 | |
| 40 | Guillaume Garreau | 4.623 | 1945-1949 | |
| 41 | José Rodríguez | 4.701 | 1947-1956 | |
| 42 | Anton Bauer# | 4.818 | 1974-1990 | |
| 43 | Máximo Lugo | 4.847 | 1950-1953 | |
| 44 | Manuel Morales | 4.866 | 1975-1980 | |
| 45 | Jules Thébault | 4.876 | 1951-1962 | |
| 46 | Patrick Trew | 4.908 | 1941-1944 | |
| 47 | Robby McLennan | 4.922 | 1925-1929 | |
| 48 | José García | 4.947 | 1925-1929 | |
| 49 | Juan Chávez | 4.994 | 1975-1980 | |
| 50 | Po-sin Louis | 4.996 | 1960-1964 | |
| 51 | Chris Morris | 5.015 | 1969-1988 | |
| 52 | David Newby | 5.155 | 1945-1950 | |
| 53 | Pedro Flores# | 5.459 | 1982-1989 | |
| 54 | Anastagio Grande | 5.499 | 1934-1936 | |
| 55 | Ramón Díaz | 6.656 | 1982-1990 | |
| 56 | Ignacio López# | 6.662 | 1975-1989 | |
| 57 | Tomás Hernández# | 7.252 | 1975-1988 |
