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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Allen Ripley | 2.240 | 1982-1985 | |
| 2 | Lee Richmond# | 2.455 | 0-0 | |
| 3 | Dave Rozema | 2.518 | 1980-1986 | |
| 4 | Fred Johnson | 2.595 | 1987-1999 | |
| 5 | Eric Show | 2.729 | 1984-1996 | |
| 6 | Bill Travers# | 2.875 | 1988-1999 | |
| 7 | Rollie Sheldon# | 2.925 | 1991-1999 | |
| 8 | Luis Leal | 2.930 | 1980-1985 | |
| 9 | Russ Ortiz# | 2.936 | 1992-1999 | |
| 10 | Sean Manaea# | 2.968 | 1995-1998 | |
| 11 | Harry Kimberlin | 2.987 | 1986-1997 | |
| 12 | Nick Blackburn# | 3.046 | 1993-1999 | |
| 13 | Richard Dotson | 3.121 | 1980-1990 | |
| 14 | Craig Swan# | 3.141 | 1988-1999 | |
| 15 | Bill Wise# | 3.193 | 1987-1999 | |
| 16 | Horacio Ramirez# | 3.199 | 1993-1999 | |
| 17 | Bill Steele# | 3.200 | 1994-1999 | |
| 18 | Freddie Fitzsimmons# | 3.230 | 1982-1994 | |
| 19 | Allan Anderson# | 3.248 | 1993-1999 | |
| 20 | Aaron Harang# | 3.259 | 1989-1999 | |
| 21 | Ed Figueroa | 3.314 | 1988-1997 | |
| 22 | Lum Harris | 3.326 | 1988-1999 | |
| 23 | Kevin Appier# | 3.328 | 1985-1988 | |
| 24 | Randy Lerch | 3.334 | 1980-1988 | |
| 25 | Rick Mahler | 3.347 | 1980-1990 | |
| 26 | Ruben Quevedo# | 3.376 | 1990-1999 | |
| 27 | Curt Young# | 3.387 | 1991-1999 | |
| 28 | Chuck Rainey | 3.398 | 1980-1985 | |
| 29 | Rick Langford | 3.467 | 1981-1988 | |
| 30 | Ross Baumgarten | 3.474 | 1980-1985 | |
| 31 | Jeff Weaver# | 3.491 | 1996-1999 | |
| 32 | Charlie Lea | 3.508 | 1980-1998 | |
| 33 | John Butcher | 3.559 | 1983-1990 | |
| 34 | Connie Johnson# | 3.572 | 1992-1999 | |
| 35 | Tim Lollar | 3.573 | 1980-1988 | |
| 36 | Dan Petry | 3.699 | 1980-1991 | |
| 37 | Jose Acevedo# | 3.706 | 1988-1999 | |
| 38 | Happy Townsend# | 3.776 | 1983-1990 | |
| 39 | Mike Paxton | 3.829 | 1980-1985 | |
| 40 | Bill Wegman# | 3.865 | 1991-1999 | |
| 41 | Jeff C D'Amico | 3.868 | 1981-1985 | |
| 42 | Matt Keough | 3.869 | 1980-1989 | |
| 43 | Jim Beattie | 3.918 | 1980-1989 | |
| 44 | Pat Rapp | 3.924 | 1980-1993 | |
| 45 | George Zettlein | 3.941 | 1990-1999 | |
| 46 | Hal Griggs | 3.965 | 1988-1991 | |
| 47 | Ike Delock# | 3.974 | 1985-1999 | |
| 48 | Milt Wilcox | 4.045 | 1980-1986 | |
| 49 | Jim LaMarque# | 4.102 | 1993-1998 | |
| 50 | Bob Walk | 4.108 | 1980-1995 | |
| 51 | Willie Powell# | 4.142 | 1992-1999 | |
| 52 | Bob Forsch | 4.143 | 1980-1988 | |
| 53 | Brian Kingman | 4.181 | 1980-1985 | |
| 54 | Toshihide Hatafuku# | 4.201 | 1986-1999 | |
| 55 | Tim Leary# | 4.204 | 1988-1999 | |
| 56 | Ed Lynch | 4.228 | 1980-1990 | |
| 57 | Shawn Boskie | 4.277 | 1982-1994 | |
| 58 | Kevin Jarvis# | 4.281 | 1991-1999 | |
| 59 | Frank Pastore | 4.283 | 1980-1990 | |
| 60 | Mike Kekich# | 4.330 | 1993-1998 | |
| 61 | Adbert Alzolay# | 4.340 | 1993-1999 | |
| 62 | Armando Reynoso# | 4.369 | 1992-1999 | |
| 63 | Jack Harper# | 4.401 | 1990-1999 | |
| 64 | Woody Williams# | 4.403 | 1988-1999 | |
| 65 | Jennings Poindexter | 4.416 | 1986-1996 | |
| 66 | Steven Matz | 4.422 | 1981-1994 | |
| 67 | Erv Brame | 4.444 | 1991-1999 | |
| 68 | Archie Campbell# | 4.451 | 1986-1999 | |
| 69 | Drew Pomeranz | 4.504 | 1981-1995 | |
| 70 | Julian Tavarez# | 4.518 | 1988-1999 | |
| 71 | Rick Honeycutt | 4.543 | 1980-1989 | |
| 72 | Mike Norris | 4.654 | 1983-1988 | |
| 73 | Steve McCatty | 4.673 | 1980-1984 | |
| 74 | Michael Foltynewicz# | 4.726 | 1987-1996 | |
| 75 | Tom C Fisher# | 4.840 | 1993-1999 | |
| 76 | Fred Hutchinson# | 4.891 | 1993-1998 | |
| 77 | Miles Mikolas# | 5.108 | 1988-1996 | |
| 78 | Matt Harrison | 5.140 | 1982-1991 | |
| 79 | Danny Cox# | 5.186 | 1991-1999 | |
| 80 | Oil Can Boyd# | 5.221 | 1987-1995 | |
| 81 | Bob Muncrief# | 5.262 | 1991-1998 | |
| 82 | Brian Rose# | 5.328 | 1989-1999 | |
| 83 | Lew Krausse Jr | 5.561 | 1985-1999 | |
| 84 | Len Barker | 5.709 | 1986-1988 | |
| 85 | Steve Comer | 6.078 | 1980-1984 | |
| 86 | Jake Odorizzi# | 7.168 | 1988-1998 |
