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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Xavier Martínez | 0.653 | 1919 | |
| 2 | Tormod Ring | 1.466 | 1944 | |
| 3 | Theo Crowhurst | 1.527 | 1970 | |
| 4 | Minarii Lopaka | 1.528 | 1923 | |
| 5 | Roland Eissens* | 1.550 | 1922 | |
| 6 | Jorge Rodríguez | 1.574 | 1954 | |
| 7 | John Brunt | 1.576 | 1922 | |
| 8 | Bill Mitchell | 1.582 | 1977 | |
| 9 | Joseph Lindsay | 1.588 | 1940 | |
| 10 | Gregorio Reyes | 1.679 | 1928 | |
| 11 | Jordan Measures | 1.684 | 1918 | |
| 12 | Louis Hutchinson# | 1.692 | 1986 | |
| 13 | Marvin Smith | 1.734 | 1977 | |
| 14 | Conor Loveridge | 1.781 | 1952 | |
| 15 | Rory Auchnie | 1.810 | 1919 | |
| 16 | Wade Bodley# | 1.825 | 1984 | |
| 17 | Baskin Upham | 1.835 | 1952 | |
| 18 | Anthony Tween | 1.845 | 1919 | |
| 19 | Jules Merkley | 1.853 | 1916 | |
| 20 | Salvador Cortéz | 1.888 | 1946 | |
| 21 | Ewan Chaytor | 1.893 | 1931 | |
| 21 | Hayden Drake | 1.893 | 1922 | |
| 23 | Vincente Rivera | 1.898 | 1941 | |
| 24 | Glen Ollershaw | 1.903 | 1950 | |
| 25 | Forbes Rougier | 1.973 | 1922 | |
| 26 | Cronan McKlemoyle | 1.996 | 1928 | |
| 27 | Norberto Rodríguez | 1.998 | 1948 | |
| 28 | Ziaul-Haq Mas'ud | 2.020 | 1970 | |
| 29 | Joel MacAuley | 2.025 | 1948 | |
| 30 | Wibren Vogelsang | 2.038 | 1939 | |
| 31 | Lynagh Phethean | 2.045 | 1939 | |
| 32 | Liam Moncreiffe | 2.054 | 1928 | |
| 33 | Keo Akamai | 2.077 | 1967 | |
| 34 | Luis Flores | 2.085 | 1952 | |
| 35 | Walt Webster | 2.106 | 1914 | |
| 36 | Roberto Martínez | 2.108 | 1945 | |
| 37 | Lou Laitinen | 2.123 | 1940 | |
| 38 | Derek Ashling | 2.132 | 1923 | |
| 39 | Gary Beaudin | 2.139 | 1922 | |
| 40 | Richard Cooper# | 2.150 | 1987 | |
| 41 | Kunimichi Kumatani | 2.153 | 1922 | |
| 42 | Marvin Wilson | 2.157 | 1948 | |
| 43 | Bill Mitchell | 2.178 | 1978 | |
| 44 | Eugene Geldart | 2.184 | 1948 | |
| 45 | Gaëtan Schmit | 2.192 | 1924 | |
| 46 | Shaw Jesso | 2.198 | 1923 | |
| 47 | Carlos Ramírez | 2.215 | 1948 | |
| 48 | Ellis Speed | 2.222 | 1920 | |
| 49 | Vincent Caron | 2.250 | 1920 | |
| 50 | Arturo Santana# | 2.259 | 1987 | |
| 51 | Roberto Martínez | 2.263 | 1946 | |
| 52 | Paul Fox | 2.270 | 1977 | |
| 53 | Gavin Humbley | 2.278 | 1932 | |
| 54 | Minarii Lopaka | 2.294 | 1920 | |
| 55 | Martin Røsnes | 2.314 | 1930 | |
| 56 | Tyler Hale | 2.320 | 1918 | |
| 57 | Wilbur Bonnet | 2.325 | 1918 | |
| 58 | Jorge González | 2.332 | 1938 | |
| 59 | Isaias van Claveren | 2.337 | 1932 | |
| 60 | Koto Kawai | 2.343 | 1922 | |
| 61 | Brian Ford | 2.352 | 1948 | |
| 61 | Oliver Tollemache | 2.352 | 1920 | |
| 63 | Tim Wycliffe | 2.353 | 1934 | |
| 63 | Craig Medley | 2.353 | 1942 | |
| 65 | Jesús Álvarez | 2.359 | 1933 | |
| 66 | Domingo Yarrito | 2.379 | 1934 | |
| 67 | Ron Clutterbuck | 2.391 | 1918 | |
| 68 | Ricardo Peña | 2.392 | 1948 | |
| 69 | Carlos Fernández | 2.403 | 1923 | |
| 70 | Frazer Dalziel | 2.405 | 1959 | |
| 71 | José Dolit | 2.407 | 1919 | |
| 72 | Jørgen Teglbjaerg | 2.413 | 1927 | |
| 73 | Hartmann Theile | 2.421 | 1940 | |
| 74 | Jay Mills | 2.429 | 1926 | |
| 75 | Lucas Till | 2.432 | 1939 | |
| 76 | Fernando Hernández | 2.438 | 1948 | |
| 77 | Mauro Marrero | 2.439 | 1922 | |
| 78 | Romuald Salvoldelli | 2.455 | 1937 | |
| 78 | Hirokichi Ozawa | 2.455 | 1944 | |
| 78 | Jack Pitcairn | 2.455 | 1944 | |
| 81 | Matt Curran | 2.465 | 1939 | |
| 82 | Clement Reeves | 2.473 | 1932 | |
| 83 | Glenn Scruton | 2.478 | 1928 | |
| 84 | Shawn Winman | 2.483 | 1946 | |
| 85 | Paul Fox | 2.485 | 1978 | |
| 85 | Jesús Gómez | 2.485 | 1941 | |
| 87 | Wilbur Munroe | 2.494 | 1937 | |
| 88 | Bill Ryan | 2.500 | 1916 | |
| 88 | Oliver Tollemache | 2.500 | 1922 | |
| 90 | Benny Sep | 2.505 | 1933 | |
| 91 | Ricardo García | 2.512 | 1926 | |
| 92 | Tim Burg | 2.514 | 1923 | |
| 93 | Tomás Morán | 2.516 | 1926 | |
| 94 | Alfredo Fandez | 2.517 | 1953 | |
| 95 | James Doig | 2.519 | 1919 | |
| 96 | Roberto Ibarra* | 2.527 | 1931 | |
| 97 | Jonathan Florido | 2.535 | 1944 | |
| 98 | Amaro Bahia | 2.536 | 1948 | |
| 99 | Héctor Ruíz | 2.540 | 1927 | |
| 100 | Vinnie Coles | 2.544 | 1923 |
