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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Iván Ramírez | 1.859 | 1971 | |
| 2 | Matt Walker | 2.053 | 1970 | |
| 3 | Richard Summey | 2.099 | 1993 | |
| 4 | Jason Taylor | 2.170 | 1982 | |
| 5 | Max Hendricks | 2.241 | 2009 | |
| 6 | Robby Oliver | 2.278 | 1982 | |
| 7 | Juan Vargas | 2.284 | 1981 | |
| 8 | Jimmy Sessoms | 2.327 | 1974 | |
| 9 | Félix Gutiérrez | 2.331 | 1970 | |
| 10 | Nelson Rowland | 2.355 | 1989 | |
| 11 | Danny Bowman# | 2.364 | 2022 | |
| 12 | Travis Bane | 2.381 | 1995 | |
| 13 | Danny Hill | 2.445 | 1992 | |
| 14 | Paul Steele | 2.450 | 1994 | |
| 15 | Júlio Cruz | 2.472 | 1980 | |
| 16 | Curt Kelly | 2.473 | 1970 | |
| 17 | Gerard Reed# | 2.485 | 2020 | |
| 17 | Dan Cramer | 2.485 | 1975 | |
| 19 | Richard Goff | 2.506 | 1992 | |
| 20 | Glenn May | 2.510 | 1980 | |
| 21 | David Worley | 2.519 | 1970 | |
| 22 | Chet Keys | 2.524 | 2000 | |
| 23 | Jeff Crum | 2.526 | 1993 | |
| 24 | Alex Allen | 2.540 | 2014 | |
| 25 | Paul Cote | 2.599 | 1970 | |
| 26 | Miguel Tamayo | 2.618 | 1985 | |
| 27 | Matt White | 2.639 | 1973 | |
| 28 | Dave Long | 2.641 | 1994 | |
| 28 | Mark McRudds | 2.641 | 1975 | |
| 30 | Luis Carrillo | 2.647 | 1973 | |
| 31 | Lionel White Eagle | 2.680 | 1993 | |
| 32 | Aubrey Green# | 2.686 | 2020 | |
| 33 | Pepe Canseco | 2.695 | 1978 | |
| 34 | José Aponte | 2.713 | 1978 | |
| 35 | Derek George# | 2.719 | 2017 | |
| 36 | Luis Rodríguez | 2.720 | 1997 | |
| 37 | Luis Sánchez | 2.721 | 1974 | |
| 38 | Andreas White | 2.734 | 1970 | |
| 39 | Marcos Delgado | 2.735 | 1992 | |
| 40 | Juan García | 2.737 | 1973 | |
| 41 | Walt Burns | 2.747 | 1973 | |
| 42 | José Fernández | 2.787 | 1997 | |
| 43 | Santiago Muñíz | 2.798 | 2020 | |
| 44 | David Moore# | 2.801 | 2016 | |
| 45 | Ronald Rush | 2.804 | 1970 | |
| 46 | Alejandro Colón | 2.806 | 1998 | |
| 47 | William Walden | 2.820 | 2010 | |
| 48 | Javier Gonzáles | 2.823 | 1971 | |
| 49 | José Guzmán | 2.830 | 1979 | |
| 50 | Javier González | 2.833 | 1971 | |
| 50 | Fabio Dean | 2.833 | 1974 | |
| 52 | Héctor Rodríguez | 2.836 | 1972 | |
| 53 | Carlos Ortega | 2.850 | 1993 | |
| 54 | Roberto Blanco | 2.864 | 1979 | |
| 55 | Domingo Gutiérrez | 2.876 | 1980 | |
| 56 | Cale Hutchins | 2.889 | 1977 | |
| 57 | Chris Thomas | 2.899 | 1971 | |
| 58 | Francisco Santos | 2.907 | 1992 | |
| 59 | Jesús Pérez# | 2.908 | 2022 | |
| 59 | Tom Mitchell | 2.908 | 1978 | |
| 61 | Ramón Martínez | 2.917 | 1981 | |
| 62 | Carlos Castillo | 2.919 | 2016 | |
| 63 | Howard Ortíz | 2.922 | 1998 | |
| 64 | Lonnie Clark | 2.925 | 1993 | |
| 65 | Alfredo Sánchez | 2.931 | 2002 | |
| 66 | Roberto Medina | 2.957 | 1970 | |
| 67 | Steve Armstrong | 2.965 | 1975 | |
| 67 | Jorge Tente | 2.965 | 1993 | |
| 69 | Ben Fuller | 2.981 | 1985 | |
| 70 | Gabriel Bowman | 2.988 | 1981 | |
| 71 | Jimmy Nickerson | 2.991 | 2009 | |
| 72 | Ty Cook# | 2.994 | 2021 | |
| 73 | Ken White | 2.995 | 1991 | |
| 74 | Brit Cullhane | 3.000 | 1977 | |
| 74 | Michael García# | 3.000 | 2022 | |
| 76 | Mike Wilhelm | 3.005 | 1975 | |
| 76 | Jim Young | 3.005 | 1979 | |
| 78 | Robbie Reed | 3.019 | 1970 | |
| 79 | Steve Armstrong | 3.024 | 1974 | |
| 80 | Eduardo Delgadilo | 3.027 | 1993 | |
| 81 | José González | 3.036 | 1971 | |
| 82 | John Miller | 3.042 | 2020 | |
| 83 | Carlos Pérez | 3.057 | 1981 | |
| 84 | Kyle Jones | 3.066 | 1994 | |
| 85 | Yoshinori Yamaguchi | 3.084 | 1992 | |
| 86 | Chad Cooper | 3.087 | 2014 | |
| 87 | Jack Leonard | 3.089 | 1992 | |
| 88 | John Boyd | 3.093 | 1978 | |
| 89 | Javier Soto | 3.094 | 1974 | |
| 90 | Richard Wiley | 3.102 | 2005 | |
| 91 | Pedro Hernández | 3.109 | 1989 | |
| 92 | Albert Torres | 3.110 | 1977 | |
| 92 | Devin Jones | 3.110 | 2009 | |
| 94 | Peter Williams | 3.112 | 1975 | |
| 95 | Brian Johnston | 3.115 | 1977 | |
| 96 | Walt Gates | 3.117 | 1980 | |
| 97 | Juan Barbosa | 3.119 | 2011 | |
| 98 | Guillermo López | 3.121 | 1971 | |
| 99 | Michael Holmes | 3.123 | 1993 | |
| 100 | Valentín Betancourt | 3.127 | 1978 |
