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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Career Leaderboard |
|---|---|---|---|---|
| 1 | Salomon Torres# | 1.414 | 1991 | |
| 2 | Alan Newman# | 1.753 | 1990 | |
| 3 | Casey Gafford# | 2.255 | 2002 | |
| 4 | Tony Mounce | 2.434 | 1995 | |
| 5 | Carlos Perez# | 2.443 | 2002 | |
| 6 | Pedro Baez | 2.681 | 1988 | |
| 7 | Tyler Morrison# | 2.737 | 2003 | |
| 8 | Buddy Carlyle# | 2.769 | 1997 | |
| 9 | Craig Johnson | 2.799 | 1998 | |
| 10 | Jonathan Cannon | 2.815 | 2002 | |
| 11 | Javier J. Ortiz# | 2.893 | 2001 | |
| 12 | Alan Webb# | 2.930 | 1998 | |
| 13 | Jose Guzman | 2.981 | 1983 | |
| 13 | Tim Kester# | 2.981 | 1995 | |
| 15 | Josh Harris# | 3.051 | 1998 | |
| 16 | Gavin Osteen | 3.097 | 1990 | |
| 17 | Larry Luebbers | 3.130 | 1991 | |
| 18 | Jason Hammel# | 3.144 | 2003 | |
| 19 | Cliff Foster | 3.150 | 1993 | |
| 20 | Ken Cloude | 3.242 | 1995 | |
| 21 | Joe Thomas# | 3.253 | 1998 | |
| 22 | Shad Williams# | 3.268 | 1992 | |
| 23 | Mike Smith | 3.346 | 1986 | |
| 24 | Mark Holzemer | 3.367 | 1989 | |
| 25 | Peter Bauer# | 3.382 | 2003 | |
| 26 | Gil Meche# | 3.443 | 1998 | |
| 27 | Buddy Blair# | 3.456 | 2003 | |
| 28 | Mike Spiegel | 3.462 | 2001 | |
| 29 | Jim Sweeney# | 3.478 | 2002 | |
| 30 | Emilo Ferreira# | 3.484 | 2003 | |
| 31 | Doug Bochtler | 3.496 | 1990 | |
| 32 | Gustavo Martinez# | 3.557 | 2002 | |
| 33 | Tony Arthur# | 3.561 | 2001 | |
| 34 | Peter Bauer# | 3.620 | 2001 | |
| 35 | Tim Kubinski | 3.646 | 1994 | |
| 36 | Vince Perkins# | 3.685 | 2001 | |
| 37 | Brian Cooper | 3.693 | 2001 | |
| 38 | Paul Fagan# | 3.712 | 2003 | |
| 39 | Ryan Mottl# | 3.748 | 2003 | |
| 40 | Jesse Harper# | 3.778 | 2003 | |
| 41 | Mel Rojas | 3.816 | 1987 | |
| 42 | Jarod Matthews# | 3.857 | 2003 | |
| 43 | Jose Hernandez# | 3.899 | 2002 | |
| 44 | Ryan Wing# | 3.912 | 2001 | |
| 45 | Wyatt Allen# | 3.924 | 2003 | |
| 46 | Luke Lockwood# | 3.926 | 2003 | |
| 47 | Arturo Gonzalez | 3.938 | 1974 | |
| 48 | Erik Thompson# | 3.993 | 2003 | |
| 49 | Lance Carter# | 4.007 | 1995 | |
| 50 | Kevin McDowell# | 4.020 | 2003 | |
| 51 | Nik Lubisich# | 4.035 | 2002 | |
| 52 | Ismael Ramirez# | 4.041 | 2002 | |
| 53 | Jeff Hundley# | 4.044 | 1999 | |
| 54 | Aaron Marsden# | 4.109 | 2003 | |
| 55 | Brad Knox# | 4.138 | 2002 | |
| 56 | Nik Lubisich# | 4.144 | 2001 | |
| 57 | Matt Pender# | 4.149 | 2002 | |
| 58 | Tony Pluta# | 4.206 | 2003 | |
| 59 | Eric Ireland# | 4.213 | 2002 | |
| 60 | Jason Sekany | 4.217 | 2001 | |
| 61 | Zack Greinke# | 4.303 | 2003 | |
| 62 | Wesley Crawford# | 4.310 | 2003 | |
| 63 | Jason Grote# | 4.403 | 1996 | |
| 64 | Chris Barlow# | 4.435 | 2003 | |
| 65 | Roy Wilson# | 4.468 | 2001 | |
| 66 | Brandon Emanuel | 4.471 | 1999 | |
| 67 | Eric Ackerman# | 4.489 | 2003 | |
| 68 | Jeremy King# | 4.533 | 2001 | |
| 69 | Adam Thomas | 4.596 | 2001 | |
| 70 | Jon McDonald# | 4.619 | 2003 | |
| 71 | Josue Matos# | 4.630 | 1999 | |
| 72 | Jay Yennaco | 4.633 | 1996 | |
| 73 | Chris Baker# | 4.634 | 2002 | |
| 74 | Miguel Aguero# | 4.674 | 2003 | |
| 75 | Jason Pierson | 4.714 | 1993 | |
| 76 | Leonardo Gonzalez# | 4.761 | 2002 | |
| 77 | Guadalupe Perez# | 4.790 | 2003 | |
| 78 | Richard Sander# | 4.805 | 2002 | |
| 79 | Josh Habel# | 5.034 | 2002 | |
| 80 | Luis Villarreal# | 5.143 | 2002 | |
| 81 | Jarod Matthews# | 5.152 | 2002 | |
| 82 | Dave Crouthers# | 5.161 | 2002 | |
| 83 | Elvin Nina | 5.170 | 2002 | |
| 84 | Anthony Zambotti# | 5.336 | 2003 | |
| 85 | Jason Stockstill# | 5.400 | 1997 | |
| 86 | Jackie Davidson | 5.738 | 1984 | |
| 87 | Jim Paduch# | 5.795 | 2003 |
