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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Mariano Rivera# | 0.81 | 1995-2001 | |
| 2 | Curt Schilling# | 0.82 | 1988-2001 | |
| 3 | Mike Mussina# | 0.93 | 1991-2001 | |
| 4 | Randy Johnson# | 1.01 | 1988-2001 | |
| 5 | Kevin Millwood# | 1.05 | 1997-2001 | |
| 6 | Mike Stanton# | 1.08 | 1989-2001 | |
| 7 | David Wells# | 1.10 | 1987-2001 | |
| 8 | Sterling Hitchcock# | 1.11 | 1992-2001 | |
| 9 | Denny Neagle# | 1.13 | 1991-2001 | |
| 9 | John Smoltz# | 1.13 | 1988-2001 | |
| 11 | Roger Clemens# | 1.14 | 1984-2001 | |
| 12 | Kevin Brown# | 1.19 | 1986-2001 | |
| 13 | Tom Glavine# | 1.20 | 1987-2001 | |
| 13 | Darryl Kile# | 1.20 | 1991-2001 | |
| 15 | Mike Hampton# | 1.22 | 1993-2001 | |
| 16 | Greg Maddux# | 1.23 | 1986-2001 | |
| 17 | Livan Hernandez# | 1.25 | 1996-2001 | |
| 18 | Orlando Hernandez# | 1.26 | 1998-2001 | |
| 19 | Bartolo Colon# | 1.28 | 1997-2001 | |
| 20 | Mark Wohlers# | 1.30 | 1991-2001 | |
| 21 | Andy Pettitte# | 1.35 | 1995-2001 | |
| 22 | Jeff Nelson# | 1.37 | 1992-2001 | |
| 23 | Charles Nagy# | 1.38 | 1990-2001 | |
| 24 | Scott Erickson# | 1.40 | 1990-2000 | |
| 25 | Armando Benitez# | 1.45 | 1994-2001 | |
| 26 | Al Leiter# | 1.46 | 1987-2001 | |
| 27 | Andy Benes# | 1.47 | 1989-2001 | |
| 28 | Aaron Sele# | 1.51 | 1993-2001 | |
| 29 | Jose Mesa# | 1.56 | 1987-2001 | |
| 30 | Todd Stottlemyre# | 1.59 | 1988-2000 | |
| 31 | Jaret Wright# | 1.82 | 1997-2001 |
