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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Chris Hatcher# | 2.820 | 1990-2001 | |
| 2 | Grant Roberts# | 2.948 | 1986-2001 | |
| 3 | Rex Brothers# | 3.023 | 1986-2001 | |
| 4 | Carl Hubbell# | 3.121 | 1992-2001 | |
| 5 | Jhoan Duran# | 3.122 | 1988-2001 | |
| 6 | Foster Edwards# | 3.125 | 1983-2001 | |
| 7 | Bobby Shantz | 3.143 | 1981-1997 | |
| 8 | Raul Alcantara# | 3.168 | 1982-2001 | |
| 9 | John Axford# | 3.211 | 1986-2001 | |
| 10 | Bill Burbach | 3.234 | 1983-1998 | |
| 11 | Tyler Anderson | 3.290 | 1980-1988 | |
| 12 | Brayan Bello# | 3.306 | 1987-2001 | |
| 13 | Zach Duke | 3.358 | 1980-1983 | |
| 14 | Devin Williams | 3.374 | 1980-1994 | |
| 15 | Mark Buehrle# | 3.390 | 1980-2001 | |
| 16 | Dallas Keuchel | 3.392 | 1980-1986 | |
| 17 | Bob Moose | 3.427 | 1980-1989 | |
| 18 | Gordon Jones | 3.429 | 1986-1995 | |
| 18 | Bob Anderson | 3.429 | 1980-1997 | |
| 20 | Rick Rhoden# | 3.440 | 1994-2001 | |
| 21 | Kevin Siegrist | 3.486 | 1980-1995 | |
| 22 | Mark Langston* | 3.507 | 1980-1994 | |
| 23 | Dave Veres# | 3.514 | 1991-2001 | |
| 24 | Jim York | 3.515 | 1982-2000 | |
| 25 | Jack Fisher# | 3.546 | 1994-2001 | |
| 26 | Art Ceccarelli | 3.560 | 1980-1989 | |
| 27 | Blake Stein | 3.568 | 1980-1988 | |
| 28 | Dutch Leonard | 3.584 | 1981-1992 | |
| 29 | Vern Geishert | 3.604 | 1980-1989 | |
| 30 | Robbie Ray | 3.621 | 1980-1992 | |
| 31 | Roy Oswalt# | 3.630 | 1988-2001 | |
| 31 | Jim Willis | 3.630 | 1980-1990 | |
| 33 | Dave Borkowski | 3.631 | 1984-1999 | |
| 34 | John Miller# | 3.668 | 1986-2000 | |
| 35 | Clayton Andrews | 3.697 | 1980-1997 | |
| 36 | Reyes Moronta | 3.705 | 1980-1991 | |
| 37 | Earl Francis# | 3.706 | 1991-2001 | |
| 38 | Jim Merritt | 3.712 | 1980-1994 | |
| 39 | Buddy Carlyle | 3.717 | 1980-1992 | |
| 40 | Tom Buskey | 3.718 | 1980-1985 | |
| 41 | Ian Snell | 3.725 | 1980-1992 | |
| 42 | Sonny Gray# | 3.738 | 1997-2001 | |
| 43 | Jim Donohue | 3.750 | 1981-1994 | |
| 44 | Cory Bailey# | 3.752 | 1985-2001 | |
| 45 | Sonny Siebert | 3.764 | 1982-1999 | |
| 46 | Tom Bradley | 3.779 | 1980-1985 | |
| 47 | Ray Bare# | 3.780 | 1987-2001 | |
| 48 | Mike Adams | 3.785 | 1980-1988 | |
| 49 | Sterling Hitchcock | 3.793 | 1980-1990 | |
| 50 | Joe Moeller# | 3.797 | 1991-2001 | |
| 51 | Blake Snell# | 3.801 | 1988-2001 | |
| 52 | Joey Hamilton# | 3.804 | 1998-2001 | |
| 53 | Gaylord Perry | 3.817 | 1980-1995 | |
| 54 | Jon Matlack | 3.834 | 1981-1999 | |
| 55 | Luke Weaver# | 3.853 | 1992-2001 | |
| 55 | Chad Gaudin | 3.853 | 1981-1993 | |
| 55 | John Patterson | 3.853 | 1981-1997 | |
| 58 | Matt Guerrier | 3.863 | 1985-1999 | |
| 59 | Ira Hutchinson | 3.872 | 1980-1987 | |
| 60 | Urbano Lugo | 3.877 | 1980-1993 | |
| 61 | Barry Zito | 3.883 | 1980-1994 | |
| 62 | Dave Dravecky | 3.891 | 1987-1997 | |
| 63 | Nathan Eovaldi# | 3.893 | 1996-2001 | |
| 64 | Dixie Leverett | 3.894 | 1980-1988 | |
| 65 | Sam McDowell | 3.901 | 1986-1999 | |
| 66 | Phil Niekro | 3.906 | 1983-1998 | |
| 67 | Dave Goltz# | 3.909 | 1990-1998 | |
| 68 | Bill Bevens | 3.910 | 1982-1993 | |
| 69 | Bob Turley | 3.917 | 1980-1986 | |
| 69 | Hiroki Kuroda# | 3.917 | 1993-2001 | |
| 71 | Frank Baumann# | 3.935 | 1997-2001 | |
| 72 | Warren Spahn | 3.937 | 1980-1995 | |
| 73 | Dave Schmidt | 3.938 | 1980-1991 | |
| 74 | Tony Saunders# | 3.952 | 1988-1993 | |
| 75 | Jin-ho Cho | 3.959 | 1980-1991 | |
| 76 | Ike Delock | 3.966 | 1985-1996 | |
| 77 | Jakob Junis | 3.968 | 1984-1997 | |
| 78 | Kevin McCarthy | 3.977 | 1985-1998 | |
| 79 | Don Kaiser# | 3.987 | 1984-2000 | |
| 80 | Red Witt# | 4.001 | 1982-2001 | |
| 81 | John Candelaria# | 4.016 | 1980-2001 | |
| 82 | Red Embree | 4.019 | 1981-1994 | |
| 83 | Jerad Eickhoff | 4.024 | 1981-1997 | |
| 84 | Mike King | 4.027 | 1980-1994 | |
| 85 | Rollie Sheldon | 4.037 | 1984-1995 | |
| 86 | Odalis Perez | 4.041 | 1985-1995 | |
| 86 | Jeff Sellers | 4.041 | 1980-1998 | |
| 88 | Mike Trombley | 4.062 | 1980-1991 | |
| 89 | Len Barker | 4.063 | 1980-1992 | |
| 90 | Terry Felton | 4.066 | 1985-1997 | |
| 91 | Gerrit Cole | 4.067 | 1980-1985 | |
| 92 | Karl Spooner | 4.071 | 1980-1991 | |
| 93 | Ted Lyons | 4.075 | 1980-1990 | |
| 94 | Steven Matz# | 4.088 | 1989-2000 | |
| 95 | Esteban Loaiza# | 4.089 | 1988-2001 | |
| 96 | Brian Kingman | 4.094 | 1989-1998 | |
| 97 | La Marr Hoyt# | 4.096 | 1985-2000 | |
| 98 | Joe Coleman | 4.102 | 1981-1994 | |
| 99 | John Montefusco | 4.104 | 1986-1997 | |
| 100 | Omar Daal | 4.109 | 1980-1990 |
