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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Hiroki Kuroda# | 0.000 | 1995 | |
| 2 | Sam McDowell | 0.365 | 1993 | |
| 3 | Sonny Gray# | 0.443 | 1999 | |
| 4 | Jhoan Duran# | 0.529 | 1989 | |
| 5 | Paul Moskau | 0.600 | 1986 | |
| 5 | Bob Friend | 0.600 | 1988 | |
| 7 | Bill Gullickson# | 0.964 | 1993 | |
| 8 | Atley Donald | 1.038 | 1989 | |
| 9 | Jhoan Duran# | 1.059 | 1996 | |
| 10 | Mark Langston* | 1.066 | 1989 | |
| 11 | Daisuke Matsuzaka | 1.102 | 1989 | |
| 12 | Carl Hubbell# | 1.125 | 1997 | |
| 13 | Kip Wells# | 1.149 | 1990 | |
| 13 | Jhoan Duran# | 1.149 | 1988 | |
| 15 | Omar Olivares | 1.174 | 1985 | |
| 16 | Dave Borkowski | 1.200 | 1990 | |
| 17 | Chris Hatcher# | 1.266 | 1995 | |
| 18 | Ray Bare# | 1.350 | 1990 | |
| 19 | Mike King | 1.378 | 1982 | |
| 20 | Joe Coleman | 1.440 | 1982 | |
| 21 | Peter Moylan | 1.473 | 1982 | |
| 22 | Dustin Hermanson# | 1.500 | 1994 | |
| 23 | Len Barker | 1.543 | 1980 | |
| 24 | Jon Matlack | 1.588 | 1984 | |
| 24 | Tom Glavine | 1.588 | 1981 | |
| 24 | Kyle Lohse# | 1.588 | 1993 | |
| 27 | Doug Rau# | 1.643 | 1998 | |
| 28 | Ian Snell | 1.653 | 1981 | |
| 29 | Blake Snell# | 1.658 | 1996 | |
| 30 | Homer Bailey# | 1.667 | 1996 | |
| 31 | Mickey Lolich# | 1.688 | 1988 | |
| 31 | Jim Merritt | 1.688 | 1980 | |
| 33 | Mike Nagy# | 1.714 | 1994 | |
| 34 | Jhoan Duran# | 1.723 | 1998 | |
| 34 | Bob Anderson | 1.723 | 1991 | |
| 36 | Chad Gaudin | 1.761 | 1981 | |
| 36 | Robbie Ray | 1.761 | 1988 | |
| 38 | Jim Willis | 1.800 | 1983 | |
| 38 | Vern Geishert | 1.800 | 1982 | |
| 40 | Joey Hamilton# | 1.862 | 1998 | |
| 41 | Bobby Shantz | 1.964 | 1992 | |
| 41 | John Candelaria# | 1.964 | 1989 | |
| 43 | Daniel Wright | 1.985 | 1992 | |
| 44 | Albie Lopez | 1.989 | 1985 | |
| 45 | Tommy Hunter | 2.000 | 1989 | |
| 45 | Ian Snell | 2.000 | 1980 | |
| 47 | Mike Trombley | 2.038 | 1981 | |
| 48 | Tom Bradley | 2.045 | 1982 | |
| 49 | Mike Ryba# | 2.051 | 1997 | |
| 50 | Earl Francis# | 2.077 | 1997 | |
| 50 | Mike Nagy# | 2.077 | 1995 | |
| 50 | Omar Daal | 2.077 | 1987 | |
| 50 | Don Nottebart | 2.077 | 1983 | |
| 54 | Robbie Ray | 2.093 | 1987 | |
| 55 | Roy Oswalt# | 2.100 | 1996 | |
| 56 | Omar Olivares | 2.139 | 1982 | |
| 57 | Kevin Ritz# | 2.160 | 1997 | |
| 57 | Scott Sanderson | 2.160 | 1987 | |
| 59 | Robbie Ray | 2.177 | 1984 | |
| 60 | Ray Bare# | 2.189 | 1998 | |
| 61 | Bruce Howard# | 2.204 | 1990 | |
| 61 | Bill Lee# | 2.204 | 1993 | |
| 63 | Bill Lee# | 2.219 | 1992 | |
| 64 | Walker Buehler# | 2.250 | 1988 | |
| 65 | Freddie Toliver | 2.288 | 1984 | |
| 66 | Greg Minton | 2.298 | 1992 | |
| 66 | Bill Lee | 2.298 | 1988 | |
| 68 | Barry Zito | 2.302 | 1986 | |
| 69 | Chris Holt# | 2.314 | 1998 | |
| 70 | Ricky Romero# | 2.333 | 1992 | |
| 71 | Blake Stein | 2.348 | 1985 | |
| 71 | Matt Guerrier | 2.348 | 1996 | |
| 71 | Odalis Perez | 2.348 | 1991 | |
| 71 | Roy Oswalt# | 2.348 | 1989 | |
| 75 | Mike LaCoss | 2.400 | 1989 | |
| 75 | Red Witt# | 2.400 | 1991 | |
| 77 | Ray Bare# | 2.411 | 1994 | |
| 78 | Phil Niekro | 2.418 | 1985 | |
| 78 | Bobby Shantz | 2.418 | 1990 | |
| 80 | Joe Moeller# | 2.432 | 1994 | |
| 81 | Joe Krakauskas | 2.455 | 1984 | |
| 81 | Art Ceccarelli | 2.455 | 1987 | |
| 83 | Jim Willis | 2.475 | 1984 | |
| 84 | John Axford# | 2.500 | 1995 | |
| 84 | Chris Bosio | 2.500 | 1984 | |
| 86 | Phil Niekro | 2.538 | 1990 | |
| 87 | Vern Olsen# | 2.541 | 1995 | |
| 88 | Bobby Shantz | 2.554 | 1991 | |
| 89 | Blake Snell# | 2.571 | 1992 | |
| 90 | Don Schwall | 2.589 | 1980 | |
| 91 | Jim Merritt | 2.605 | 1989 | |
| 92 | Dave Goltz# | 2.613 | 1990 | |
| 93 | Shawn Chacon# | 2.634 | 1989 | |
| 94 | Bob Anderson | 2.647 | 1996 | |
| 94 | Paul Erickson# | 2.647 | 1999 | |
| 94 | Barry Zito | 2.647 | 1981 | |
| 97 | Warren Spahn | 2.662 | 1980 | |
| 98 | Paul Moskau | 2.673 | 1982 | |
| 99 | Luke Weaver# | 2.734 | 1992 | |
| 100 | Don Nottebart | 2.746 | 1984 |
