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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | John Stark | 1.134 | 1974 | |
| 2 | Johnny Stanford | 1.608 | 1992 | |
| 3 | William Taylor | 1.646 | 1992 | |
| 4 | Paco Gonzáles | 1.742 | 1993 | |
| 5 | Carlos Ortíz | 1.764 | 1975 | |
| 6 | Jesús Aranda | 1.830 | 1975 | |
| 7 | Trevor O'Neill | 1.845 | 1986 | |
| 8 | Ken Johnson | 1.951 | 1977 | |
| 9 | Brian Woods | 1.958 | 1989 | |
| 10 | Joe Guelker | 2.002 | 1980 | |
| 11 | Keith Smith | 2.010 | 1985 | |
| 12 | Brett Pitts | 2.133 | 1972 | |
| 13 | Douglas Yoder | 2.192 | 1976 | |
| 14 | Rich Harris | 2.246 | 2013 | |
| 15 | Jorge Rivería | 2.259 | 1985 | |
| 16 | Augusto Baca | 2.263 | 1976 | |
| 17 | José Gallardo | 2.264 | 1980 | |
| 18 | José Guzmán | 2.293 | 1985 | |
| 19 | Marvin Richardson | 2.357 | 1986 | |
| 20 | Melvin Wade | 2.358 | 1994 | |
| 21 | José Gómez | 2.378 | 1977 | |
| 22 | Ángel Guerrero | 2.408 | 1983 | |
| 22 | Adrián Rodríguez | 2.408 | 1974 | |
| 24 | Bill Hill | 2.410 | 1987 | |
| 25 | Iván Pérez | 2.455 | 2010 | |
| 26 | Eric Phillips | 2.459 | 1993 | |
| 27 | Gregory Moore | 2.476 | 1973 | |
| 28 | Ron Dixon | 2.488 | 1986 | |
| 29 | Pete Copeland | 2.494 | 1996 | |
| 30 | Bart Calhoun | 2.500 | 1975 | |
| 31 | Edgardo Martínez | 2.515 | 1977 | |
| 32 | Donald Shaw | 2.522 | 1992 | |
| 33 | Mike Hodges | 2.534 | 1979 | |
| 34 | John Allen | 2.540 | 2010 | |
| 35 | Jim Lacy | 2.546 | 1973 | |
| 36 | Jake Mann | 2.550 | 1973 | |
| 37 | Clement Jones | 2.558 | 1973 | |
| 38 | Tony Ladner | 2.561 | 1975 | |
| 39 | Ray Britton | 2.564 | 1973 | |
| 40 | Christian Foster# | 2.587 | 2014 | |
| 41 | Joseph St. John | 2.596 | 1985 | |
| 42 | Sal Hughes | 2.597 | 1973 | |
| 43 | Ed Davis | 2.602 | 1992 | |
| 44 | Mike Oglethorpe | 2.609 | 1973 | |
| 45 | Ángel Rodríguez | 2.613 | 1997 | |
| 46 | Juan Morales | 2.618 | 2013 | |
| 47 | Tom Jones# | 2.624 | 2015 | |
| 48 | Marvin Smith# | 2.632 | 2012 | |
| 49 | Roger Calhoun | 2.643 | 1975 | |
| 50 | Roberto Torres | 2.644 | 1988 | |
| 51 | Terry Lewis | 2.652 | 1977 | |
| 52 | Clarence Milligan | 2.691 | 1977 | |
| 53 | Tyrone Alexander# | 2.695 | 2017 | |
| 54 | José López# | 2.700 | 2020 | |
| 55 | Chris Cook | 2.710 | 2013 | |
| 56 | Chandler Osborne | 2.725 | 1977 | |
| 57 | Bob Hopkins | 2.726 | 1974 | |
| 58 | Raúl Pérez | 2.736 | 1973 | |
| 59 | Javier Guzmán | 2.742 | 1994 | |
| 60 | James Clark | 2.790 | 1985 | |
| 61 | Ray Harris | 2.801 | 2009 | |
| 62 | Steve Wilson | 2.803 | 1977 | |
| 63 | Jason Russell | 2.805 | 1983 | |
| 64 | Júlio Díaz | 2.810 | 1973 | |
| 65 | Bob Allen | 2.818 | 1978 | |
| 66 | Kuniaki Maeda | 2.823 | 2008 | |
| 67 | Fernando Hernández | 2.833 | 2005 | |
| 68 | Eddy Wall | 2.838 | 1978 | |
| 69 | Doug Williams | 2.858 | 1984 | |
| 70 | Robinson Martínez | 2.860 | 1995 | |
| 71 | Marvin Richardson | 2.872 | 1987 | |
| 72 | Ben Smith | 2.875 | 1987 | |
| 73 | Harry Crippen | 2.877 | 1972 | |
| 74 | David Lee | 2.887 | 1983 | |
| 75 | José Guzmán | 2.901 | 1985 | |
| 76 | Bailey Jackson | 2.905 | 1984 | |
| 77 | Earl Ingram | 2.907 | 2006 | |
| 78 | Ray Clark | 2.928 | 2015 | |
| 79 | Chester McKinney | 2.938 | 1975 | |
| 80 | Muhuc Gasana | 2.945 | 2005 | |
| 81 | Ryan Jordan | 2.957 | 1993 | |
| 82 | Mike Blackburn | 2.959 | 1986 | |
| 83 | Ismael Varela | 2.961 | 1985 | |
| 84 | Mark McRudds | 2.965 | 1972 | |
| 85 | Douglas Keijzer | 2.972 | 1976 | |
| 86 | Mario Chávez | 2.990 | 1988 | |
| 86 | Octávio Ayala | 2.990 | 1982 | |
| 86 | Bruce Boyd# | 2.990 | 2021 | |
| 86 | Mike Jones | 2.990 | 1988 | |
| 90 | Fernando Mojica# | 2.995 | 2017 | |
| 90 | Roberto Estrada | 2.995 | 1993 | |
| 92 | Jim Lewis | 3.005 | 1972 | |
| 93 | Jacob Parker | 3.010 | 1977 | |
| 94 | Mark Blair# | 3.011 | 2007 | |
| 95 | Barry Patton | 3.014 | 1985 | |
| 96 | Ramón García | 3.016 | 1987 | |
| 97 | Arturo Miranda | 3.035 | 1982 | |
| 98 | Steve Merritt | 3.045 | 1977 | |
| 99 | Ramón Monveal | 3.046 | 1981 | |
| 100 | Manuel Araújo | 3.051 | 1982 |
