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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Steve Bannatyne | 1.664 | 1993 | |
| 2 | Whit O'Lonegan | 2.041 | 1972 | |
| 3 | John Fuller | 2.052 | 1975 | |
| 4 | Derek Hanson | 2.077 | 1974 | |
| 5 | Jamal Wilson | 2.109 | 1970 | |
| 6 | Rod Lake | 2.139 | 1976 | |
| 7 | Dan Sullivan | 2.160 | 1970 | |
| 8 | Juan Jose Colón | 2.180 | 1970 | |
| 9 | Haruki Tanaka | 2.259 | 1973 | |
| 10 | Nelson Canó | 2.267 | 1971 | |
| 11 | Bob Hennessey | 2.298 | 1970 | |
| 12 | Steve Armstrong | 2.312 | 1972 | |
| 13 | Sean Penn | 2.320 | 1973 | |
| 14 | Alberto Cuellar | 2.324 | 1970 | |
| 15 | Jimmy MacDonald | 2.365 | 1992 | |
| 16 | Larry LeJeune | 2.375 | 1974 | |
| 17 | Paul Kelly | 2.386 | 1970 | |
| 18 | Jack Jackson | 2.395 | 1970 | |
| 19 | Alberto Cuellar | 2.403 | 1972 | |
| 20 | David Hendricks | 2.408 | 1985 | |
| 21 | Paul Sackett | 2.422 | 1986 | |
| 22 | Carlos Lara | 2.432 | 1976 | |
| 23 | Jaime Juárez | 2.440 | 1993 | |
| 24 | Erwin Hagin | 2.473 | 1971 | |
| 25 | Mike Owens | 2.478 | 1970 | |
| 26 | Zachary Martin | 2.480 | 1981 | |
| 27 | Rafael Hinojosa | 2.484 | 1974 | |
| 28 | Jim Jones | 2.487 | 1982 | |
| 29 | Carlos Cordero | 2.493 | 1992 | |
| 30 | Yoshino Okada | 2.496 | 1970 | |
| 30 | Kenny Garland | 2.496 | 1981 | |
| 32 | Mitch Curry | 2.499 | 2004 | |
| 33 | Matt Brock | 2.506 | 1985 | |
| 34 | Jorge Salas | 2.515 | 1970 | |
| 35 | Terry Schneider | 2.520 | 1973 | |
| 36 | Brian Garrison | 2.522 | 1970 | |
| 37 | Eduardo Rodríguez | 2.526 | 1970 | |
| 38 | Júlio Díaz | 2.538 | 1970 | |
| 39 | Paul Lewis | 2.543 | 2014 | |
| 40 | Dave Daniels | 2.547 | 1984 | |
| 41 | Ron Green | 2.550 | 1970 | |
| 42 | Mike Buckley# | 2.567 | 2014 | |
| 43 | David McGowan | 2.573 | 1984 | |
| 44 | Tom Mitchell | 2.592 | 1977 | |
| 45 | John McDaniel | 2.593 | 1997 | |
| 46 | Mark Graham | 2.599 | 1970 | |
| 47 | Will Urquhart | 2.602 | 1984 | |
| 48 | Paul Spence | 2.610 | 1994 | |
| 49 | Elias Roy | 2.623 | 1972 | |
| 50 | Brad Dunlap | 2.626 | 1973 | |
| 51 | Alejandro Medina# | 2.630 | 2019 | |
| 52 | Will Urquhart | 2.632 | 1986 | |
| 53 | Elton Benson | 2.639 | 1981 | |
| 54 | Eric Ford | 2.642 | 1973 | |
| 55 | Gabriel Hernández | 2.666 | 1976 | |
| 56 | Leonard Thompson | 2.681 | 1971 | |
| 57 | Mark Cates | 2.685 | 1982 | |
| 58 | Gil Greene | 2.691 | 1984 | |
| 59 | Jim Steele | 2.695 | 1984 | |
| 60 | John McGowan | 2.700 | 2014 | |
| 60 | Don Mullen | 2.700 | 2004 | |
| 62 | Peter Smith | 2.704 | 1971 | |
| 63 | Jody Hall | 2.705 | 1983 | |
| 64 | Ricardo Gómez | 2.707 | 1972 | |
| 65 | Aaron Wright | 2.711 | 1970 | |
| 66 | Larry LeJeune | 2.721 | 1973 | |
| 67 | Gary Patty | 2.722 | 1973 | |
| 68 | Damon Montgomery | 2.725 | 1970 | |
| 69 | Gustavo Rivas | 2.740 | 1992 | |
| 70 | Kevin Joyner | 2.741 | 1971 | |
| 71 | Brad Dunlap | 2.743 | 1974 | |
| 72 | Dan Cramer | 2.745 | 1974 | |
| 73 | Keith Ruckman | 2.751 | 1970 | |
| 74 | Lawrence Callahan# | 2.761 | 2020 | |
| 75 | Jorge Alomar | 2.768 | 1972 | |
| 76 | Pedro García | 2.769 | 1988 | |
| 77 | Peter Williams# | 2.775 | 2020 | |
| 78 | Brent Morris | 2.788 | 1971 | |
| 79 | Russell Carter | 2.791 | 1972 | |
| 79 | Jimmy Boone | 2.791 | 1971 | |
| 81 | Tony Cruz | 2.802 | 1970 | |
| 82 | Derek Hanson | 2.823 | 1970 | |
| 83 | Joseph Long | 2.829 | 1977 | |
| 83 | Luis Ortíz | 2.829 | 1973 | |
| 85 | Jon Copeland | 2.831 | 1982 | |
| 86 | Jeremy Harris | 2.833 | 1973 | |
| 87 | Juan Jose Sánchez | 2.840 | 1987 | |
| 88 | Ángel Pérez | 2.842 | 1972 | |
| 89 | Gary Stafford | 2.849 | 2010 | |
| 90 | George Johnson* | 2.855 | 1999 | |
| 91 | Brian Dickson | 2.859 | 1995 | |
| 92 | Thomas Matthews | 2.871 | 1970 | |
| 93 | Zeggan Mwendapole | 2.883 | 1973 | |
| 94 | Aaron Spivey | 2.884 | 1972 | |
| 95 | Roy Gore | 2.890 | 1984 | |
| 96 | José Watkins* | 2.898 | 1996 | |
| 97 | Ricardo Ocampo | 2.905 | 1986 | |
| 98 | Andrés Pérez | 2.909 | 1974 | |
| 99 | Jeff Wilson | 2.919 | 1986 | |
| 99 | Owen Roberts | 2.919 | 2010 |
