| Year | Team | W | L | G | IP | ERA | WHIP | K | BB | HR | K/9 | BB/9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1997 | Boston Red Sox | 3 | 0 | 28 | 25.0 | 2.52 | 1.20 | 22 | 11 | 3 | 7.92 | 3.96 |
| 1998 |
| Boston Red Sox |
| 1 |
| 1 |
| 29 |
| 26.0 |
| 3.46 |
| 1.58 |
| 14 |
| 15 |
| 2 |
| 4.85 |
| 5.19 |
| 1999 | Oakland Athletics | 2 | 0 | 6 | 19.1 | 1.86 | 0.57 | 15 | 3 | 2 | 6.98 | 1.40 |
| 2000 | Oakland Athletics | 0 | 1 | 5 | 16.0 | 9.00 | 2.19 | 5 | 9 | 4 | 2.81 | 5.06 |
| 2000 | Florida Marlins | 1 | 0 | 18 | 25.1 | 6.04 | 1.86 | 27 | 16 | 6 | 9.59 | 5.68 |
| 2000 | 1 | 1 | 23 | 41.1 | 7.19 | 1.98 | 32 | 25 | 10 | 6.97 | 5.44 |
| 2001 | Chicago Cubs | 0 | 0 | 17 | 20.2 | 2.61 | 1.40 | 24 | 15 | 4 | 10.45 | 6.53 |
| 2002 | Chicago Cubs | 2 | 0 | 11 | 14.2 | 8.59 | 1.43 | 14 | 8 | 6 | 8.59 | 4.91 |
| 2003 | Texas Rangers | 3 | 3 | 35 | 45.1 | 3.18 | 1.17 | 38 | 20 | 3 | 7.54 | 3.97 |
| 2004 | Texas Rangers | 3 | 0 | 60 | 67.0 | 2.55 | 1.33 | 54 | 29 | 5 | 7.25 | 3.90 |
| 2005 | Texas Rangers | 0 | 2 | 30 | 35.2 | 6.81 | 1.77 | 30 | 16 | 8 | 7.57 | 4.04 |
| 2006 | Texas Rangers | 1 | 3 | 62 | 57.0 | 3.95 | 1.44 | 56 | 28 | 7 | 8.84 | 4.42 |
| 2007 | Texas Rangers | 2 | 0 | 28 | 39.0 | 2.77 | 1.38 | 32 | 21 | 3 | 7.38 | 4.85 |
| 2007 | Atlanta Braves | 1 | 0 | 30 | 28.0 | 2.25 | 1.25 | 23 | 16 | 1 | 7.39 | 5.14 |
| 2007 | 3 | 0 | 58 | 67.0 | 2.55 | 1.33 | 55 | 37 | 4 | 7.39 | 4.97 |
| 2008 | Kansas City Royals | 5 | 0 | 57 | 64.2 | 3.48 | 1.39 | 49 | 29 | 6 | 6.82 | 4.04 |
| 2009 | Kansas City Royals | 1 | 1 | 41 | 41.1 | 4.79 | 1.79 | 34 | 19 | 9 | 7.40 | 4.14 |
| 2009 | Minnesota Twins | 1 | 0 | 16 | 9.0 | 2.00 | 1.11 | 8 | 3 | 1 | 8.00 | 3.00 |
| 2009 | 2 | 1 | 57 | 50.1 | 4.29 | 1.67 | 42 | 22 | 10 | 7.51 | 3.93 |
| 2010 | Minnesota Twins | 1 | 1 | 41 | 34.0 | 3.44 | 1.21 | 25 | 8 | 5 | 6.62 | 2.12 |
| Career | — | 27 | 12 | 514 | 568.0 | 3.83 | 1.42 | 470 | 266 | 75 | 7.45 | 4.21 |
