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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Rafael Hinojosa | 1.396 | 1975 | |
| 2 | Rafael Hinojosa | 1.488 | 1976 | |
| 3 | Héctor Ríos | 1.570 | 1978 | |
| 4 | Justin Coker | 1.776 | 1989 | |
| 5 | Edgardo Martínez | 1.812 | 1978 | |
| 6 | David Benton | 1.929 | 1997 | |
| 7 | Anthony Tolbert | 1.998 | 1987 | |
| 8 | Fabio Dean | 2.060 | 1973 | |
| 9 | Jeffery Nelson | 2.067 | 1972 | |
| 10 | Jack Proctor | 2.074 | 1972 | |
| 11 | Pancho Franco | 2.162 | 1981 | |
| 12 | Kurt Cole | 2.165 | 1970 | |
| 13 | Bret Martin | 2.226 | 1987 | |
| 14 | Andre Woods | 2.232 | 1975 | |
| 15 | Júlio Martínez | 2.258 | 1979 | |
| 16 | Kyle Simpson | 2.297 | 1970 | |
| 17 | Quentin Shaw | 2.348 | 1970 | |
| 18 | Lowell Helms | 2.352 | 1993 | |
| 19 | Bob Wagner | 2.360 | 1992 | |
| 20 | Rafi Pellicer | 2.362 | 1987 | |
| 21 | José Mejía | 2.366 | 1981 | |
| 21 | Dale Webb | 2.366 | 1992 | |
| 21 | Will McCord | 2.366 | 1992 | |
| 24 | Jason Johnson | 2.370 | 2002 | |
| 25 | Ken Johnson | 2.393 | 1971 | |
| 26 | Lorenzo García# | 2.394 | 2007 | |
| 27 | Mario Estrada | 2.396 | 1979 | |
| 28 | Ricky Christian | 2.409 | 1996 | |
| 29 | James Goff | 2.421 | 1974 | |
| 30 | Bob Holland | 2.426 | 1972 | |
| 31 | Ken Kerr | 2.431 | 2009 | |
| 31 | Mike Allen | 2.431 | 1974 | |
| 33 | Bart Calhoun | 2.444 | 1976 | |
| 34 | Forest Holbrook | 2.445 | 1982 | |
| 35 | Daniel Jiménez | 2.451 | 1987 | |
| 36 | Ron Seals | 2.455 | 1974 | |
| 37 | Curt Parrish | 2.482 | 1992 | |
| 38 | Robert Ray | 2.496 | 1972 | |
| 39 | Tom Waddell | 2.497 | 1987 | |
| 40 | Chance Black | 2.498 | 1974 | |
| 41 | Scott Lee | 2.504 | 1979 | |
| 42 | Andrew Edwards | 2.507 | 1971 | |
| 43 | Alex Campbell | 2.508 | 1970 | |
| 44 | Ramón Machado | 2.526 | 2001 | |
| 45 | Carlos Cordero | 2.528 | 1973 | |
| 46 | Jorge Domingo | 2.534 | 2009 | |
| 47 | Félix Colón# | 2.569 | 2022 | |
| 48 | Manuel Hernández | 2.573 | 1972 | |
| 49 | Glenn Barker | 2.582 | 1970 | |
| 50 | John Galloway | 2.583 | 1996 | |
| 51 | Greg Smith | 2.608 | 1981 | |
| 52 | Bob Brandt | 2.631 | 1993 | |
| 53 | Jason Taylor | 2.647 | 1981 | |
| 54 | Tommy MacNeill | 2.649 | 1983 | |
| 55 | Wayne Browning | 2.653 | 1970 | |
| 56 | Melvin Charite | 2.654 | 1971 | |
| 57 | Jorge Rodríguez | 2.659 | 2010 | |
| 58 | Ted Price | 2.661 | 1977 | |
| 59 | Scott Bray | 2.667 | 2010 | |
| 60 | Carl Berger | 2.678 | 1981 | |
| 61 | Ramón Ruíz | 2.690 | 2000 | |
| 62 | Pedro Silva | 2.695 | 1977 | |
| 62 | Jesús Morales | 2.695 | 2010 | |
| 64 | Gilbert Miller | 2.696 | 1981 | |
| 65 | Billy Perkins | 2.721 | 1987 | |
| 66 | Jamie Lee | 2.725 | 2008 | |
| 67 | Chad Turner | 2.730 | 1981 | |
| 68 | Benedict Vanlandingham | 2.734 | 1995 | |
| 69 | Russell Craig | 2.735 | 1972 | |
| 70 | Bob Lawson | 2.742 | 1984 | |
| 71 | Kyle Jones | 2.752 | 1993 | |
| 72 | Ronald Mason | 2.755 | 1998 | |
| 73 | Dwayne Holston | 2.756 | 1998 | |
| 74 | Henry Myers | 2.766 | 1992 | |
| 75 | António Castro | 2.771 | 1978 | |
| 76 | Paul Hutchins | 2.784 | 1976 | |
| 77 | Vicente Dávila | 2.790 | 1988 | |
| 78 | Héctor Álvarez | 2.801 | 1992 | |
| 79 | Alberto Romano | 2.807 | 1971 | |
| 80 | Charlie Turner | 2.809 | 1971 | |
| 81 | Francisco Jiménez | 2.810 | 1983 | |
| 81 | José Guzmán | 2.810 | 1978 | |
| 83 | José Gómez | 2.816 | 1978 | |
| 84 | Fabio Dean | 2.824 | 1972 | |
| 85 | Brandon Piper | 2.826 | 1979 | |
| 86 | Víctor Guillén | 2.845 | 1970 | |
| 87 | Marvin Smith# | 2.847 | 2014 | |
| 88 | Emery Fox | 2.848 | 1973 | |
| 89 | Martín Morales | 2.849 | 1978 | |
| 90 | Dan MacNamara | 2.850 | 1992 | |
| 91 | Pedro López | 2.859 | 2003 | |
| 91 | Arthur McClain | 2.859 | 2012 | |
| 93 | Blake Adams | 2.861 | 2016 | |
| 94 | Orlando Pérez | 2.865 | 1979 | |
| 95 | Alonso Flores | 2.870 | 1971 | |
| 96 | Rob Powers | 2.872 | 2001 | |
| 97 | Rob Hunt | 2.874 | 1982 | |
| 98 | Reggie Dunbar | 2.879 | 1974 | |
| 99 | Héctor Castro | 2.881 | 1987 | |
| 100 | Frank Price | 2.887 | 1998 |
