| Year | Team | W | L | G | IP | ERA | WHIP | K | BB | HR | K/9 | BB/9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1995 | Pittsburgh Pirates | 8 | 9 | 32 | 172.2 | 5.16 | 1.51 | 85 | 55 | 21 | 4.43 | 2.87 |
| 1996 |
| Pittsburgh Pirates |
| 2 |
| 3 |
| 10 |
| 52.2 |
| 4.96 |
| 1.59 |
| 32 |
| 19 |
| 11 |
| 5.47 |
| 3.25 |
| 1997 | Pittsburgh Pirates | 11 | 11 | 33 | 196.1 | 4.13 | 1.38 | 122 | 56 | 17 | 5.59 | 2.57 |
| 1998 | Pittsburgh Pirates | 6 | 5 | 21 | 91.2 | 4.52 | 1.37 | 53 | 30 | 13 | 5.20 | 2.95 |
| 1998 | Texas Rangers | 3 | 6 | 14 | 79.1 | 5.90 | 1.58 | 55 | 22 | 15 | 6.24 | 2.50 |
| 1998 | 9 | 11 | 35 | 171.0 | 5.16 | 1.47 | 108 | 52 | 28 | 5.68 | 2.74 |
| 1999 | Texas Rangers | 9 | 5 | 30 | 120.1 | 4.56 | 1.40 | 77 | 40 | 10 | 5.76 | 2.99 |
| 2000 | Texas Rangers | 5 | 6 | 20 | 107.1 | 5.37 | 1.53 | 75 | 31 | 21 | 6.29 | 2.60 |
| 2000 | Toronto Blue Jays | 5 | 7 | 14 | 92.0 | 3.62 | 1.32 | 62 | 26 | 8 | 6.07 | 2.54 |
| 2000 | 10 | 13 | 34 | 199.1 | 4.56 | 1.43 | 137 | 57 | 29 | 6.19 | 2.57 |
| 2001 | Toronto Blue Jays | 11 | 11 | 36 | 190.0 | 5.02 | 1.47 | 110 | 40 | 27 | 5.21 | 1.89 |
| 2002 | Toronto Blue Jays | 9 | 10 | 25 | 151.1 | 5.71 | 1.52 | 87 | 38 | 18 | 5.17 | 2.26 |
| 2003 | Chicago White Sox | 21 | 9 | 34 | 226.1 | 2.90 | 1.11 | 207 | 56 | 17 | 8.23 | 2.23 |
| 2004 | Chicago White Sox | 9 | 5 | 21 | 140.2 | 4.86 | 1.43 | 83 | 45 | 23 | 5.31 | 2.88 |
| 2004 | New York Yankees | 1 | 2 | 10 | 42.1 | 8.50 | 2.06 | 34 | 26 | 9 | 7.23 | 5.53 |
| 2004 | 10 | 7 | 31 | 183.0 | 5.70 | 1.57 | 117 | 71 | 32 | 5.75 | 3.49 |
| 2005 | Washington Nationals | 12 | 10 | 34 | 217.0 | 3.77 | 1.30 | 173 | 55 | 18 | 7.18 | 2.28 |
| 2006 | Oakland Athletics | 11 | 9 | 26 | 154.2 | 4.89 | 1.42 | 97 | 40 | 17 | 5.64 | 2.33 |
| 2007 | Oakland Athletics | 1 | 0 | 2 | 14.2 | 1.84 | 0.95 | 5 | 4 | 1 | 3.07 | 2.45 |
| 2007 | Los Angeles Dodgers | 1 | 4 | 5 | 22.2 | 8.34 | 1.85 | 15 | 16 | 9 | 5.96 | 6.35 |
| 2007 | 2 | 4 | 7 | 37.1 | 5.79 | 1.50 | 20 | 20 | 10 | 4.82 | 4.82 |
| 2008 | Los Angeles Dodgers | 1 | 2 | 7 | 24.0 | 5.63 | 1.21 | 9 | 5 | 3 | 3.38 | 1.88 |
| 2008 | Chicago White Sox | 0 | 0 | 3 | 3.0 | 3.00 | 1.00 | 1 | 0 | 1 | 3.00 | 0.00 |
| 2008 | 1 | 2 | 10 | 27.0 | 5.33 | 1.19 | 10 | 5 | 4 | 3.33 | 1.67 |
| Career | — | 126 | 114 | 377 | 2099.0 | 4.65 | 1.41 | 1,382 | 604 | 259 | 5.93 | 2.59 |
