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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | John Underhill | 1.541 | 1918 | |
| 2 | Daniel Dow | 1.545 | 1931 | |
| 3 | Caleb Stephenson | 1.620 | 1919 | |
| 4 | Roberto Guerrero | 1.657 | 1942 | |
| 5 | Lou Russell | 1.702 | 1940 | |
| 6 | Sloan Ide | 1.779 | 1920 | |
| 7 | Colm Murden | 1.792 | 1931 | |
| 8 | Jorge Martínez | 1.851 | 1935 | |
| 9 | Christophe Neveu | 1.888 | 1945 | |
| 10 | Randy Fiefield | 2.026 | 1926 | |
| 11 | Don Makeever | 2.148 | 1943 | |
| 12 | Paul Williams | 2.149 | 1923 | |
| 13 | Joost Hekman | 2.151 | 1944 | |
| 14 | Elisha Yoder* | 2.155 | 1933 | |
| 15 | Stefan Pettersson | 2.170 | 1945 | |
| 16 | Francisco Flores | 2.190 | 1931 | |
| 17 | Frank Hui | 2.210 | 1944 | |
| 18 | António García | 2.219 | 1936 | |
| 19 | Theodore Driscoll | 2.220 | 1945 | |
| 20 | Leonardo Parra | 2.228 | 1942 | |
| 21 | Danny Hewson | 2.244 | 1918 | |
| 22 | Toirealach Rylands | 2.250 | 1927 | |
| 23 | Roberto Martínez | 2.255 | 1947 | |
| 24 | Jesús González | 2.262 | 1919 | |
| 25 | Steve Camus | 2.277 | 1944 | |
| 26 | Aidan Heddon | 2.279 | 1918 | |
| 27 | José Canseco | 2.281 | 1923 | |
| 28 | Sabih Najm al Din | 2.285 | 1984 | |
| 29 | Paul Stevens | 2.290 | 1920 | |
| 30 | Dan Marriott | 2.291 | 1913 | |
| 31 | Bertrand Board | 2.294 | 1918 | |
| 32 | Montrell Avellino | 2.298 | 1937 | |
| 33 | Dean Vesey | 2.306 | 1918 | |
| 34 | Vic Stuckey | 2.321 | 1920 | |
| 35 | Jaime Camacho | 2.324 | 1943 | |
| 36 | Bolan Routledge | 2.327 | 1945 | |
| 37 | Veríssimo Hintze | 2.328 | 1935 | |
| 38 | Aaron Wrayford | 2.335 | 1926 | |
| 39 | Joost Hekman | 2.345 | 1945 | |
| 40 | Jung-tae Kyung | 2.353 | 1945 | |
| 41 | Gregorio Reyes | 2.362 | 1931 | |
| 42 | Craig Medley | 2.364 | 1943 | |
| 43 | José Canseco | 2.368 | 1922 | |
| 44 | Adrian Sanford | 2.369 | 1976 | |
| 45 | José Hurtado | 2.378 | 1926 | |
| 46 | Juan Carbajal | 2.379 | 1945 | |
| 47 | Juan Carbajal | 2.381 | 1943 | |
| 47 | Nariaki Miura | 2.381 | 1938 | |
| 49 | Fernando Hernández | 2.386 | 1932 | |
| 50 | James McDonell | 2.387 | 1920 | |
| 51 | Christophe Neveu | 2.389 | 1943 | |
| 52 | Rafael Mendoza | 2.392 | 1976 | |
| 53 | Joost Hekman | 2.397 | 1946 | |
| 54 | Dennis Brouwers | 2.401 | 1918 | |
| 55 | Fred Erwin | 2.411 | 1918 | |
| 56 | Kian Derrick | 2.421 | 1948 | |
| 57 | Charles Sands | 2.435 | 1918 | |
| 58 | Ramón Hernández | 2.438 | 1931 | |
| 59 | Paul Williams | 2.451 | 1922 | |
| 60 | Dave Freake | 2.455 | 1913 | |
| 61 | Denzel Jacques# | 2.459 | 1977 | |
| 62 | Igram Verhoek | 2.475 | 1926 | |
| 63 | Emílio Hernández | 2.477 | 1927 | |
| 64 | Lois Menu | 2.482 | 1918 | |
| 65 | Logan Shufflebotham | 2.486 | 1919 | |
| 66 | Bill Mitchell | 2.487 | 1976 | |
| 67 | Johan Orum | 2.492 | 1942 | |
| 67 | Pedro Ramírez | 2.492 | 1937 | |
| 69 | Roberto Guerrero | 2.503 | 1940 | |
| 70 | Luis Moreno | 2.506 | 1936 | |
| 71 | Ewan Forrester | 2.508 | 1918 | |
| 72 | Manfred Aehrenthal | 2.519 | 1965 | |
| 73 | Félix Estrada | 2.521 | 1940 | |
| 74 | Ridwan Zakariyya | 2.522 | 1970 | |
| 75 | Petter Asther | 2.526 | 1943 | |
| 76 | Koen Schoon | 2.529 | 1943 | |
| 77 | Juan Solís | 2.539 | 1974 | |
| 78 | Jorge López | 2.545 | 1945 | |
| 79 | Kelsey Blees | 2.546 | 1943 | |
| 80 | Nakazo Arai | 2.547 | 1971 | |
| 81 | Matis Duval | 2.551 | 1913 | |
| 82 | Carl Butlin | 2.555 | 1919 | |
| 83 | Rio Waring | 2.560 | 1932 | |
| 84 | Carlos Fernández | 2.564 | 1925 | |
| 84 | Luis Manozca | 2.564 | 1933 | |
| 86 | José Orosco | 2.566 | 1948 | |
| 86 | Jim Brisebois | 2.566 | 1959 | |
| 86 | Gary Beaudin | 2.566 | 1924 | |
| 89 | Stefan Pettersson | 2.567 | 1946 | |
| 90 | Jesús Valentín | 2.571 | 1924 | |
| 91 | Pedro Bernal | 2.574 | 1935 | |
| 92 | Waldemar de Bruin | 2.575 | 1948 | |
| 93 | Veríssimo Hintze | 2.579 | 1934 | |
| 93 | Tsugiharu Masuda | 2.579 | 1931 | |
| 95 | Luis Moreno | 2.589 | 1933 | |
| 96 | Mark Chennells | 2.600 | 1920 | |
| 97 | Harry Dronfield | 2.606 | 1964 | |
| 98 | Mas Niyangabo | 2.623 | 1975 | |
| 99 | Abdul-Mu'izz Hana# | 2.625 | 1982 | |
| 100 | José García | 2.638 | 1964 |
