| Year | Team | G | GS | W | L | SV | CG | SHO | IP | H | R | ER | HR | BB | K | ERA | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1998 | 12 | 10 | 2 | 3 | 0 | 0 | 0 | 51 | 45 | 28 | 18 | 2 | 12 | 50 | 3.18 | 1.12 | |
| 1999 | 11 | 11 | 0 | 3 | 0 | 0 | 0 | 51.1 | 61 | 36 | 21 | 4 | 18 | 43 | 3.68 | 1.54 | |
| 2000 | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 6.2 | 15 | 9 | 7 | 0 | 3 | 1 | 9.45 | 2.70 | |
| 2001 | 25 | 24 | 9 | 12 | 0 | 1 | 0 | 145 | 130 | 69 | 54 | 12 | 39 | 123 | 3.35 | 1.17 | |
| 2002 | 27 | 27 | 5 | 12 | 0 | 0 | 0 | 139 | 152 | 98 | 82 | 12 | 75 | 127 | 5.31 | 1.63 | |
| 2003 | 37 | 0 | 3 | 1 | 14 | 0 | 0 | 44 | 37 | 14 | 11 | 4 | 25 | 38 | 2.25 | 1.41 | |
| 2004 | Red Sox | 11 | 0 | 2 | 1 | 0 | 0 | 0 | 10.2 | 13 | 10 | 10 | 2 | 6 | 5 | 8.44 | 1.78 |
| 2004 | 38 | 0 | 3 | 3 | 1 | 0 | 0 | 67.1 | 73 | 37 | 28 | 5 | 31 | 57 | 3.74 | 1.54 | |
| 2005 | 35 | 6 | 3 | 4 | 1 | 0 | 0 | 58.2 | 74 | 43 | 39 | 4 | 27 | 46 | 5.98 | 1.72 | |
| 2006 | 2 | 2 | 2 | 0 | 0 | 0 | 0 | 12.1 | 10 | 5 | 5 | 1 | 3 | 11 | 3.65 | 1.05 | |
| 2007 | 6 | 5 | 0 | 2 | 0 | 0 | 0 | 24 | 26 | 18 | 13 | 1 | 15 | 17 | 4.88 | 1.71 | |
| 2008 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 2.1 | 1 | 0 | 0 | 0 | 1 | 1 | 0.00 | .860 | |
| Career Total | 11 | 0 | 2 | 1 | 0 | 0 | 0 | 10.2 | 13 | 10 | 10 | 2 | 6 | 5 | 8.44 | 1.78 | |
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