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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Arvid Arnouts | 1.577 | 1918 | |
| 2 | Stu Jackson* | 1.791 | 1931 | |
| 3 | Carl Hattie | 1.896 | 1933 | |
| 4 | Pearson Tuxford* | 1.897 | 1941 | |
| 5 | José Marino | 1.975 | 1924 | |
| 6 | Ellis Masters | 2.011 | 1924 | |
| 7 | Amin Zahid | 2.044 | 1970 | |
| 8 | Ángel Lombos | 2.060 | 1926 | |
| 9 | Joe Carroll | 2.077 | 1944 | |
| 10 | Ryuichi Honda | 2.150 | 1970 | |
| 11 | Kel Brooks* | 2.229 | 1932 | |
| 12 | Mario Pérez | 2.238 | 1919 | |
| 13 | Martin Wilhelmsson | 2.264 | 1970 | |
| 14 | Carlos Cruz | 2.282 | 1962 | |
| 15 | Mauro Robles | 2.289 | 1918 | |
| 16 | Jeff Brown | 2.316 | 1970 | |
| 17 | Jorge Tovar | 2.362 | 1977 | |
| 18 | Lee Anderson | 2.381 | 1978 | |
| 19 | Jim Davidson | 2.395 | 1919 | |
| 20 | Ted Cunningham | 2.399 | 1933 | |
| 21 | Richard Hall | 2.410 | 1967 | |
| 22 | Curt Fullerton | 2.415 | 1980 | |
| 23 | Ellis Masters | 2.421 | 1925 | |
| 23 | Graham Lee | 2.421 | 1978 | |
| 23 | Tin-jong Siu | 2.421 | 1945 | |
| 26 | Vicente Torres | 2.439 | 1928 | |
| 27 | Tin-jong Siu | 2.467 | 1943 | |
| 28 | Pedro Serrano | 2.485 | 1920 | |
| 29 | David Davis | 2.521 | 1921 | |
| 30 | Mauro Alfaro | 2.528 | 1931 | |
| 31 | David Little | 2.532 | 1918 | |
| 32 | Stephen Reeves | 2.542 | 1932 | |
| 33 | Kevin Holmes# | 2.553 | 1978 | |
| 34 | Jason Ash | 2.558 | 1918 | |
| 35 | Brandon Pare | 2.559 | 1922 | |
| 36 | José Marino | 2.571 | 1919 | |
| 37 | Norris Kifer | 2.576 | 1926 | |
| 38 | Félix Ornelas | 2.589 | 1919 | |
| 39 | Vicente Torres | 2.592 | 1927 | |
| 40 | José Ojeda | 2.600 | 1919 | |
| 41 | Tse-peng Lao | 2.610 | 1933 | |
| 42 | Vic Vandermeer | 2.611 | 1933 | |
| 43 | Frank McJannett | 2.629 | 1933 | |
| 44 | Quincy van Halteren | 2.636 | 1940 | |
| 45 | Vincente Cinza | 2.645 | 1931 | |
| 46 | John Miles | 2.646 | 1918 | |
| 47 | Juan Álvarez | 2.647 | 1978 | |
| 48 | Dylan Short | 2.673 | 1931 | |
| 49 | Terry Ward | 2.677 | 1918 | |
| 50 | Loflinger Arrau | 2.679 | 1943 | |
| 51 | Loren Leonard | 2.684 | 1918 | |
| 52 | Toyokazu Yamada | 2.700 | 1944 | |
| 52 | José Marino | 2.700 | 1918 | |
| 54 | Steven Bingham | 2.707 | 1926 | |
| 55 | Doug MacGruder | 2.719 | 1918 | |
| 56 | Ji-an Bai | 2.736 | 1968 | |
| 57 | Juan Ríos | 2.739 | 1932 | |
| 58 | Josh Atkinson | 2.755 | 1934 | |
| 59 | Mark Gray | 2.757 | 1924 | |
| 60 | Johnny Jones | 2.759 | 1926 | |
| 61 | Juan Martínez | 2.769 | 1926 | |
| 62 | Amghar Apara | 2.770 | 1976 | |
| 63 | Loflinger Arrau | 2.797 | 1944 | |
| 64 | James Brown | 2.799 | 1933 | |
| 65 | John Drake | 2.802 | 1934 | |
| 66 | James Brown | 2.804 | 1932 | |
| 67 | Jesús López | 2.813 | 1931 | |
| 68 | António Morales | 2.817 | 1926 | |
| 69 | Robert Reese | 2.822 | 1919 | |
| 69 | Greg van Dam | 2.822 | 1927 | |
| 69 | Louis Dillon | 2.822 | 1968 | |
| 72 | Gabriel Ramírez | 2.824 | 1922 | |
| 73 | José León | 2.826 | 1945 | |
| 74 | Shane Hill | 2.850 | 1936 | |
| 75 | Juan Martínez | 2.858 | 1930 | |
| 76 | Héctor Laydón | 2.864 | 1938 | |
| 77 | José Marino | 2.871 | 1922 | |
| 78 | David Bennett | 2.878 | 1932 | |
| 79 | Akira Abe | 2.881 | 1916 | |
| 80 | Félix Ornelas | 2.883 | 1920 | |
| 81 | José Carrasco | 2.884 | 1921 | |
| 82 | James Brown | 2.885 | 1931 | |
| 83 | Juan Martínez | 2.895 | 1919 | |
| 84 | Patrick Smith | 2.896 | 1935 | |
| 84 | Jeff Rainey# | 2.896 | 1986 | |
| 86 | Michael Jones | 2.897 | 1919 | |
| 87 | José Marino | 2.901 | 1920 | |
| 87 | Mitch Payne | 2.901 | 1918 | |
| 89 | Leonardo Zaragoza | 2.905 | 1921 | |
| 90 | Shane Hill | 2.906 | 1937 | |
| 90 | Roberto Campos | 2.906 | 1927 | |
| 92 | Ian Spokes | 2.907 | 1931 | |
| 93 | Doug Lawrence | 2.919 | 1922 | |
| 94 | Lorenzo Torres | 2.925 | 1929 | |
| 95 | José Cedeño | 2.938 | 1926 | |
| 96 | Christian Adams | 2.939 | 1924 | |
| 97 | Ramão Lumbrales | 2.941 | 1926 | |
| 98 | Wilson Hidalgo | 2.943 | 1924 | |
| 99 | Miguel Torres | 2.944 | 1944 | |
| 100 | Ramão Lumbrales | 2.945 | 1928 |
