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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Paul Oxley | 1.773 | 1971 | |
| 2 | Cris Abreu | 1.899 | 1984 | |
| 3 | George Banks* | 2.012 | 1985 | |
| 4 | Jack Proctor | 2.065 | 1973 | |
| 5 | Nick Bannatyne | 2.140 | 1995 | |
| 6 | Rafi Pellicer | 2.145 | 1990 | |
| 7 | Tom Campbell* | 2.178 | 1977 | |
| 8 | Michael Powell | 2.219 | 1992 | |
| 9 | Anthony Springer# | 2.227 | 2015 | |
| 10 | José Rivera# | 2.238 | 2019 | |
| 11 | Bret Martin | 2.244 | 1992 | |
| 12 | Paul Oxley | 2.247 | 1972 | |
| 13 | Dave Hall | 2.258 | 1979 | |
| 14 | Don Ranby | 2.338 | 1978 | |
| 15 | Paul Oxley | 2.342 | 1970 | |
| 16 | Robby Brown# | 2.350 | 2021 | |
| 17 | Sergio Torres | 2.404 | 1980 | |
| 18 | Matt Smith | 2.455 | 1981 | |
| 19 | Paul Melton | 2.480 | 1985 | |
| 20 | Cristián Castillo | 2.486 | 1971 | |
| 21 | Jorge Gutiérrez | 2.516 | 1992 | |
| 22 | Harvey Covington | 2.525 | 1977 | |
| 23 | Iván Ramos | 2.540 | 1997 | |
| 24 | Clarence Milligan | 2.542 | 1981 | |
| 25 | Russell Craig | 2.551 | 1973 | |
| 26 | Bob Smith | 2.565 | 1971 | |
| 27 | David Standard | 2.568 | 1993 | |
| 28 | Artie Sullivan | 2.569 | 1993 | |
| 29 | Steve Hardin | 2.578 | 1983 | |
| 30 | Elmer Davis | 2.581 | 1982 | |
| 31 | Mike Underwood | 2.606 | 1982 | |
| 32 | Richie Harrison | 2.607 | 1993 | |
| 33 | Diego Padilla | 2.616 | 1996 | |
| 34 | Pete Jones | 2.626 | 1982 | |
| 35 | Bubba Lynn | 2.644 | 1970 | |
| 36 | Jorge Aragón | 2.657 | 1974 | |
| 36 | Tony Thomas | 2.657 | 1973 | |
| 38 | Luis López | 2.675 | 2017 | |
| 39 | Michael Byrne | 2.678 | 1972 | |
| 40 | Miguel Tamayo | 2.685 | 1992 | |
| 41 | Kelly Moser | 2.696 | 1974 | |
| 42 | Darby Knox | 2.704 | 1972 | |
| 43 | Mashashi Endo | 2.717 | 1993 | |
| 44 | David Edwards | 2.720 | 2010 | |
| 45 | Michael Price | 2.726 | 2004 | |
| 46 | Joseph Jones | 2.731 | 2006 | |
| 47 | Mike Leyland | 2.732 | 1992 | |
| 48 | Felipe Álvarez | 2.740 | 1985 | |
| 49 | Orlando Pérez | 2.744 | 1980 | |
| 50 | Benedict Johnson | 2.754 | 1971 | |
| 51 | Joseph Mathews# | 2.765 | 2010 | |
| 51 | Kelly Moser | 2.765 | 1975 | |
| 53 | Randy Boyd | 2.767 | 1978 | |
| 54 | Matt Palmer | 2.777 | 1973 | |
| 55 | Jon Cook | 2.782 | 2003 | |
| 55 | Seth Williams | 2.782 | 1992 | |
| 57 | Troy Surber | 2.786 | 1972 | |
| 58 | Hiang-ta An | 2.802 | 1975 | |
| 59 | Travis Fuller | 2.811 | 1993 | |
| 60 | Bill Young | 2.818 | 1980 | |
| 61 | Erik Boyd | 2.822 | 1997 | |
| 62 | Britt Castro | 2.831 | 1983 | |
| 63 | Fernando Cortéz | 2.833 | 2002 | |
| 64 | Alejandro González | 2.835 | 2002 | |
| 65 | Kurt Hickman | 2.839 | 1970 | |
| 66 | Rick Thomas | 2.854 | 1973 | |
| 67 | Ed Pride | 2.869 | 1997 | |
| 68 | Cody Rice | 2.883 | 2013 | |
| 69 | Gavin Brooks | 2.887 | 1994 | |
| 70 | Wilson Fernández | 2.891 | 1978 | |
| 71 | Lyndon Holloway | 2.896 | 1970 | |
| 72 | Miguel Cervantes | 2.900 | 1970 | |
| 73 | Pete Belcher | 2.903 | 1987 | |
| 74 | Don Brown | 2.916 | 1970 | |
| 75 | Mark Harris# | 2.919 | 2021 | |
| 76 | Tomás Amayía | 2.938 | 1973 | |
| 77 | Tyrone Foster | 2.941 | 1975 | |
| 78 | Forest Holbrook | 2.945 | 1983 | |
| 78 | Júlio Balay# | 2.945 | 2017 | |
| 80 | Luis Villarreal | 2.949 | 1998 | |
| 81 | Mal Givens | 2.953 | 1970 | |
| 82 | Ramón Pérez | 2.962 | 1971 | |
| 83 | José Navarro | 2.963 | 1997 | |
| 84 | Harvey Covington | 2.969 | 1978 | |
| 84 | Vicente Yzquierdo | 2.969 | 1973 | |
| 86 | Roy Camp | 2.970 | 1993 | |
| 87 | Brian Douglas | 2.971 | 1973 | |
| 88 | Jorge Torres | 2.973 | 2002 | |
| 89 | Rodolfo Romero | 2.982 | 1977 | |
| 90 | Jesús Rivera# | 2.987 | 2014 | |
| 91 | Todd Lee | 2.990 | 2019 | |
| 91 | Howard Terrill | 2.990 | 1982 | |
| 93 | Dan McCormick | 2.995 | 1971 | |
| 93 | José Vega | 2.995 | 1976 | |
| 95 | Mike Hatcher | 2.996 | 1970 | |
| 96 | Ricardo Gómez | 3.000 | 1971 | |
| 96 | Chris Richter# | 3.000 | 2022 | |
| 98 | Colt Williams | 3.005 | 1993 | |
| 99 | Tex Jones# | 3.011 | 2019 | |
| 100 | Kenny Scott | 3.014 | 1974 |
