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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | MacKenzie Gore# | 2.593 | 1993-2000 | |
| 2 | Kyle Gibson# | 2.816 | 1995-1998 | |
| 3 | Steve Johnson | 2.835 | 1980-1994 | |
| 4 | Luis Leal# | 2.840 | 1994-2000 | |
| 5 | Scott Kamieniecki# | 2.914 | 1991-2000 | |
| 6 | Len Barker | 2.935 | 1992-1995 | |
| 7 | Jesse Jefferson# | 2.948 | 1993-2000 | |
| 8 | Dick Drott | 2.965 | 1983-1994 | |
| 9 | Rollie Sheldon | 3.003 | 1984-2000 | |
| 10 | Luke Hamlin# | 3.018 | 1995-2000 | |
| 11 | Hector Noesi# | 3.020 | 1992-1997 | |
| 12 | Ike Delock | 3.051 | 1985-1998 | |
| 13 | Walt Terrell# | 3.055 | 1983-2000 | |
| 14 | Calvin Maduro# | 3.071 | 1991-1999 | |
| 15 | Jeff Samardzija# | 3.088 | 1984-2000 | |
| 16 | Charlie Wagner# | 3.096 | 1997-2000 | |
| 17 | Steven Brault | 3.143 | 1991-1998 | |
| 18 | Wade Miley# | 3.161 | 1988-2000 | |
| 19 | Shawn Hill | 3.174 | 1983-1997 | |
| 20 | Jeff Karstens# | 3.194 | 1995-1999 | |
| 21 | Thornton Lee# | 3.248 | 1991-2000 | |
| 22 | Dave LaPoint | 3.259 | 1984-1993 | |
| 23 | Ben Sheets# | 3.280 | 1982-2000 | |
| 24 | Brandon Claussen# | 3.288 | 1993-2000 | |
| 25 | Bill Butler | 3.334 | 1990-1999 | |
| 26 | Clyde King# | 3.335 | 1990-1998 | |
| 27 | Jorge Campillo# | 3.337 | 1994-2000 | |
| 28 | Mike LaCoss | 3.361 | 1988-1998 | |
| 29 | Les Cain | 3.391 | 1980-1996 | |
| 30 | Lynn Nelson | 3.401 | 1988-1994 | |
| 31 | Fernando Arroyo | 3.417 | 1988-1997 | |
| 32 | Johan Oviedo# | 3.418 | 1993-2000 | |
| 33 | Ramon Martinez | 3.439 | 1980-1992 | |
| 34 | Wayne Simpson | 3.514 | 1986-1998 | |
| 35 | John Dettmer# | 3.522 | 1993-1999 | |
| 36 | Gerry Arrigo | 3.528 | 1981-1998 | |
| 37 | Todd Stottlemyre | 3.542 | 1983-1999 | |
| 38 | Glenn Dishman | 3.545 | 1984-1990 | |
| 39 | Dick Estelle# | 3.563 | 1985-1999 | |
| 40 | Bob Harris | 3.564 | 1991-1998 | |
| 41 | Les Howe | 3.568 | 1990-1999 | |
| 42 | Charlie Bishop | 3.570 | 1981-1990 | |
| 43 | Seth Etherton | 3.576 | 1992-1999 | |
| 44 | Rufe Gentry# | 3.587 | 1996-2000 | |
| 45 | Bob Knepper | 3.589 | 1980-1995 | |
| 46 | Kris Wilson | 3.628 | 1986-1995 | |
| 47 | Ken Kravec | 3.636 | 1981-1993 | |
| 48 | John Koronka | 3.643 | 1993-1996 | |
| 49 | Bob Moose | 3.684 | 1980-1993 | |
| 50 | Brian Givens# | 3.726 | 1992-1999 | |
| 51 | Tyler Chatwood# | 3.734 | 1987-2000 | |
| 52 | Earl Wilson | 3.747 | 1980-1991 | |
| 53 | Jim Unknown | 3.771 | 1980-1985 | |
| 54 | Barry Cort | 3.774 | 1989-1998 | |
| 55 | Ismael Valdez | 3.809 | 1989-1995 | |
| 56 | Pete Charton | 3.811 | 1980-1987 | |
| 57 | Johnny Beazley | 3.829 | 1981-1993 | |
| 58 | Juan Abreu | 3.832 | 1980-1987 | |
| 59 | Jim Hughes# | 3.849 | 1993-2000 | |
| 60 | Reese Olson | 3.856 | 1992-1998 | |
| 61 | Ryan Rowland-Smith | 3.873 | 1986-1993 | |
| 62 | Harry Taylor | 3.876 | 1980-1987 | |
| 63 | Sandy Vance# | 3.877 | 1993-2000 | |
| 64 | Dutch Leonard | 3.912 | 1981-1994 | |
| 65 | Paul Moskau | 3.916 | 1982-1997 | |
| 66 | Gary Wheelock | 3.927 | 1980-1991 | |
| 67 | Matt Chico | 3.934 | 1980-1989 | |
| 68 | Paul LaPalme | 3.949 | 1985-1991 | |
| 69 | Marco Estrada# | 3.953 | 1994-2000 | |
| 70 | Robert Ray | 3.958 | 1981-1989 | |
| 71 | Victor Santos | 3.971 | 1982-1994 | |
| 72 | Ted Gray | 3.985 | 1981-1997 | |
| 73 | Steve Kraly | 3.999 | 1983-1995 | |
| 74 | Sloppy Thurston | 4.026 | 1981-2000 | |
| 75 | Al Sima | 4.077 | 1989-1995 | |
| 76 | Carlos Moore# | 4.094 | 1986-2000 | |
| 77 | Chuck Dobson | 4.117 | 1987-1997 | |
| 78 | Bob Brown# | 4.129 | 1992-2000 | |
| 79 | Marv Breuer# | 4.140 | 1995-2000 | |
| 80 | Shawn Estes | 4.157 | 1980-1990 | |
| 81 | Jim Maloney# | 4.174 | 1981-1998 | |
| 82 | Jake Thompson | 4.185 | 1980-1989 | |
| 83 | Mike Bruhert | 4.205 | 1992-1998 | |
| 84 | Al Williams | 4.239 | 1983-1992 | |
| 85 | Jim Unknown | 4.258 | 1980-1985 | |
| 86 | Britt Burns | 4.269 | 1980-1997 | |
| 87 | Brian Meadows | 4.281 | 1980-1990 | |
| 88 | Ralph Botting | 4.289 | 1988-1999 | |
| 89 | Luke Walker | 4.294 | 1985-1995 | |
| 90 | Don August# | 4.296 | 1994-2000 | |
| 91 | Rafael Valdez# | 4.303 | 1993-1999 | |
| 92 | Joey Jay# | 4.318 | 1996-2000 | |
| 93 | Hank Aguirre | 4.329 | 1980-1991 | |
| 94 | Lil Stoner | 4.330 | 1990-1997 | |
| 95 | Jim Unknown | 4.347 | 1980-1985 | |
| 96 | Dennis Lewallyn | 4.422 | 1985-1996 | |
| 97 | Lefty Stewart# | 4.429 | 1991-2000 | |
| 98 | Jose Urena | 4.435 | 1981-1988 | |
| 99 | Jim Unknown | 4.454 | 1980-1985 | |
| 100 | Mike Boddicker | 4.457 | 1981-1989 |
