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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Hunter Jackson | 1.742 | 1918 | |
| 2 | Jacob Barrington | 1.852 | 1942 | |
| 3 | Tony Organ | 1.877 | 1918 | |
| 4 | Sumitomo Ito | 1.942 | 1932 | |
| 5 | Alfonso Román | 1.943 | 1931 | |
| 6 | Timo Ax* | 1.983 | 1932 | |
| 7 | Salvador Cortéz | 2.008 | 1947 | |
| 8 | Eric Dawe | 2.030 | 1943 | |
| 9 | Pedro Nieto | 2.046 | 1939 | |
| 10 | Bill Tattam | 2.065 | 1918 | |
| 11 | Randy Fiefield | 2.092 | 1927 | |
| 12 | Doug Mathieu | 2.114 | 1945 | |
| 13 | Jeremy Basalini | 2.137 | 1933 | |
| 14 | Nealon Redihough | 2.162 | 1942 | |
| 15 | Augusto Rivera | 2.172 | 1923 | |
| 16 | Zach King | 2.185 | 1928 | |
| 17 | Albert Moreno | 2.189 | 1934 | |
| 18 | Felipe Maese | 2.198 | 1940 | |
| 19 | Josh Gray | 2.202 | 1918 | |
| 20 | Wibren Vogelsang | 2.210 | 1942 | |
| 21 | Jimmy Vanbuskirk | 2.214 | 1927 | |
| 22 | Chris Ryan | 2.220 | 1926 | |
| 23 | Tokutomi Sugano | 2.222 | 1935 | |
| 24 | Tomás Morán | 2.234 | 1927 | |
| 25 | Kunimichi Kumatani | 2.240 | 1927 | |
| 25 | Takechi Narita | 2.240 | 1946 | |
| 27 | Ricardo Gómez | 2.258 | 1936 | |
| 28 | Hartmann Theile | 2.259 | 1943 | |
| 29 | Joachim Gruppe | 2.269 | 1946 | |
| 29 | Ming Guang | 2.269 | 1918 | |
| 31 | Aonghus Iddison | 2.316 | 1918 | |
| 32 | Franck Martel | 2.323 | 1945 | |
| 33 | Rasmus Andreassen* | 2.351 | 1934 | |
| 34 | Martin Duck | 2.373 | 1941 | |
| 35 | Ellis Clarridge | 2.374 | 1923 | |
| 36 | Jon Tosewell | 2.375 | 1947 | |
| 37 | Vincente Bamentos | 2.382 | 1927 | |
| 38 | Sébastien Clément | 2.385 | 1940 | |
| 39 | Thierry Brisset | 2.393 | 1935 | |
| 40 | Willie Simpson | 2.395 | 1918 | |
| 41 | Neil Bernard | 2.401 | 1940 | |
| 42 | Ricardo Ortíz | 2.403 | 1919 | |
| 43 | Jon Tosewell | 2.406 | 1944 | |
| 44 | Nils van der Mijl* | 2.411 | 1927 | |
| 45 | Louis Packard | 2.415 | 1919 | |
| 46 | Bernie Perron | 2.460 | 1935 | |
| 47 | Bobby Legrow | 2.467 | 1918 | |
| 48 | Jude Spurgeon | 2.473 | 1970 | |
| 49 | Justin Fairclough | 2.478 | 1914 | |
| 50 | Victor Bell | 2.479 | 1927 | |
| 51 | Luke Boulden | 2.482 | 1919 | |
| 52 | Cristo Martínez | 2.486 | 1933 | |
| 53 | Gilbert Covi | 2.518 | 1945 | |
| 54 | Tristan Varanda | 2.537 | 1931 | |
| 55 | Pedro Franco | 2.539 | 1918 | |
| 56 | José Hurtado | 2.552 | 1934 | |
| 57 | Greg Gray | 2.559 | 1946 | |
| 58 | Lawson Gillin | 2.561 | 1918 | |
| 59 | Jimmy Vanbuskirk | 2.562 | 1926 | |
| 60 | Pierre Métais | 2.565 | 1942 | |
| 61 | Paul Williams | 2.575 | 1925 | |
| 62 | David Widhoezl# | 2.583 | 1980 | |
| 63 | Graham Towes | 2.586 | 1918 | |
| 64 | Lawrence Barraclough | 2.590 | 1927 | |
| 65 | Jeffrey Bryant | 2.592 | 1918 | |
| 66 | Francisco Otero | 2.602 | 1928 | |
| 67 | Claudio Rodríguez | 2.604 | 1942 | |
| 68 | Alfredo Cervantes | 2.606 | 1923 | |
| 69 | Felipe Hernández | 2.608 | 1926 | |
| 70 | Gilberto Castagna | 2.612 | 1927 | |
| 71 | Alfonso Román | 2.616 | 1936 | |
| 72 | Chris McCormack | 2.634 | 1931 | |
| 73 | Alfredo Moreno | 2.637 | 1938 | |
| 74 | Luis Guillén | 2.645 | 1986 | |
| 75 | Cronan McKlemoyle | 2.652 | 1930 | |
| 76 | Connor Soper | 2.656 | 1918 | |
| 77 | Ryan Mossop | 2.663 | 1911 | |
| 78 | Dean Fortey | 2.666 | 1931 | |
| 79 | Luis Barrón | 2.669 | 1929 | |
| 80 | Tristan Varanda | 2.689 | 1930 | |
| 81 | Rick Dundee | 2.700 | 1976 | |
| 82 | Carlos Humphrey | 2.704 | 1945 | |
| 83 | Bill Watson | 2.712 | 1979 | |
| 84 | Domingo Minitrez | 2.716 | 1928 | |
| 85 | Kalle Pietilinen | 2.723 | 1974 | |
| 86 | Héctor Álvarez | 2.731 | 1943 | |
| 86 | Pedro Franco | 2.731 | 1919 | |
| 88 | Dennis Borton | 2.735 | 1919 | |
| 89 | António Meléndez | 2.737 | 1919 | |
| 90 | Willie Simpson | 2.744 | 1919 | |
| 91 | Josh Gray | 2.745 | 1919 | |
| 92 | Jake Cayzer | 2.747 | 1929 | |
| 93 | Max Lacoste | 2.754 | 1940 | |
| 93 | Wade Tipping | 2.754 | 1941 | |
| 95 | José Colón | 2.756 | 1934 | |
| 96 | Michael Adams | 2.757 | 1918 | |
| 97 | Phoenix Androutsos | 2.765 | 1945 | |
| 98 | Derek Hepburn | 2.768 | 1919 | |
| 99 | Noah Smith | 2.770 | 1921 | |
| 100 | Alex Sully | 2.772 | 1945 |
