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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Bob Smith | 1.856 | 1971 | |
| 2 | Austin Mitchell | 1.862 | 1979 | |
| 3 | Tom MacDowell | 1.955 | 1970 | |
| 4 | Shawn Price | 2.080 | 1973 | |
| 5 | Ronald McClure | 2.106 | 2016 | |
| 6 | Derrek Thompson | 2.114 | 1981 | |
| 7 | Harry Bennett# | 2.156 | 2019 | |
| 8 | Mark Long | 2.192 | 1977 | |
| 9 | Dave Hall | 2.217 | 1978 | |
| 10 | Chris Todd | 2.235 | 1986 | |
| 11 | Vincente Álvarez | 2.254 | 2000 | |
| 12 | Steve Armstrong | 2.319 | 1971 | |
| 13 | Jesús Flores | 2.340 | 1992 | |
| 14 | Juan Rosado | 2.344 | 1981 | |
| 15 | Brendan Farris | 2.355 | 1970 | |
| 16 | Alonso Castillo | 2.359 | 1994 | |
| 17 | Barry Patton | 2.379 | 1987 | |
| 18 | Carl Ricks | 2.382 | 1974 | |
| 19 | Kyle O'Mackesey | 2.398 | 2006 | |
| 20 | Dalton Hodges | 2.406 | 1970 | |
| 21 | Ian Scott | 2.409 | 2002 | |
| 22 | Daniel Valdéz | 2.424 | 2005 | |
| 23 | Jeffrey Lewis | 2.455 | 1999 | |
| 23 | Eric Fuller | 2.455 | 1993 | |
| 25 | Joe Hicks | 2.473 | 1990 | |
| 26 | Jorge González | 2.489 | 1998 | |
| 27 | Albert Waller | 2.490 | 2019 | |
| 28 | Lorne Wright | 2.496 | 1995 | |
| 29 | Glenn Kramer | 2.497 | 1997 | |
| 30 | Toby García# | 2.513 | 2022 | |
| 31 | Albert Parker | 2.518 | 1973 | |
| 32 | Pablo Escamilla | 2.530 | 1978 | |
| 33 | Jerry Green | 2.549 | 2009 | |
| 34 | Ken Daly | 2.555 | 2001 | |
| 35 | Albert Jefferson | 2.559 | 1970 | |
| 35 | Dan McCormick | 2.559 | 1973 | |
| 37 | Chris Martin | 2.560 | 1992 | |
| 38 | Earl Moss | 2.571 | 1980 | |
| 39 | Matt Hazen | 2.573 | 1971 | |
| 40 | Clarence Burch | 2.583 | 1998 | |
| 41 | Jack Moreno | 2.586 | 1977 | |
| 41 | Jacob Hoskins# | 2.586 | 2020 | |
| 43 | Richard Wolfe | 2.606 | 1998 | |
| 44 | Carlos Camilleris | 2.621 | 1986 | |
| 45 | Dale Bader | 2.628 | 1978 | |
| 45 | Phil Harrison | 2.628 | 1992 | |
| 47 | Armando López | 2.630 | 1972 | |
| 47 | Martin Méthot | 2.630 | 1975 | |
| 49 | David Hendricks | 2.640 | 1986 | |
| 49 | Jon Lester | 2.640 | 1996 | |
| 51 | Nicholas Sawyer | 2.653 | 1971 | |
| 51 | Mark Johnson | 2.653 | 1972 | |
| 53 | Bill Wright | 2.654 | 1992 | |
| 54 | Gerald Chambers | 2.664 | 2001 | |
| 55 | Javier Minitrez | 2.675 | 1998 | |
| 56 | Carlos García | 2.689 | 1992 | |
| 57 | Don Graham | 2.693 | 1976 | |
| 58 | Júlio Martínez | 2.695 | 1971 | |
| 59 | Steve Armstrong | 2.700 | 1973 | |
| 60 | Felipe Colón | 2.705 | 1975 | |
| 61 | Lynn Sims | 2.716 | 1970 | |
| 62 | Young-hwan Pu | 2.732 | 1992 | |
| 63 | Mal Simpson | 2.744 | 1970 | |
| 64 | Terry Jackson | 2.755 | 1987 | |
| 65 | Kevin Wheeler | 2.761 | 1979 | |
| 65 | Travis Fuller | 2.761 | 1992 | |
| 67 | Rafael González | 2.773 | 1970 | |
| 68 | Mario Murillo# | 2.775 | 2020 | |
| 69 | Shawn Combs | 2.804 | 1998 | |
| 69 | António Rivas | 2.804 | 1971 | |
| 71 | Richard O'Halloran | 2.809 | 1980 | |
| 72 | Jorge Berrios# | 2.822 | 2019 | |
| 73 | Júlio Cruz | 2.825 | 1979 | |
| 74 | Félix Pezina | 2.826 | 2002 | |
| 75 | Bobby MacKaness | 2.830 | 2003 | |
| 76 | Lewis Morrison | 2.833 | 1973 | |
| 77 | Dale Bader | 2.840 | 1976 | |
| 78 | Jason Brown | 2.842 | 1970 | |
| 78 | Todd Franks | 2.842 | 2017 | |
| 78 | Daniel Marshall | 2.842 | 2008 | |
| 81 | Vincent Burton | 2.844 | 1970 | |
| 82 | Keith Lyons | 2.861 | 1975 | |
| 82 | Aaron Spivey | 2.861 | 1973 | |
| 84 | Mario López | 2.877 | 1987 | |
| 84 | Pedro Valentín | 2.877 | 2015 | |
| 86 | Mike Buckley# | 2.878 | 2015 | |
| 87 | Daniel MacPherson | 2.889 | 1993 | |
| 87 | Jude Kelly | 2.889 | 1970 | |
| 89 | Hayden Nelson | 2.894 | 1973 | |
| 90 | Abu Jabiri | 2.895 | 1972 | |
| 91 | Trevor Bolden# | 2.900 | 2010 | |
| 92 | Steve Gourin | 2.902 | 2003 | |
| 93 | Alejandro Flores | 2.908 | 1972 | |
| 94 | Ned Jackson | 2.911 | 1987 | |
| 95 | Aaron McGill | 2.923 | 1981 | |
| 96 | Alonso Díaz | 2.928 | 1986 | |
| 97 | José Souza | 2.929 | 2009 | |
| 98 | Jamie Carson | 2.931 | 1975 | |
| 99 | Lucas Gray | 2.935 | 2007 | |
| 100 | Henry Olsen | 2.940 | 1973 |
