| Year | Team | G | GS | W | L | SV | CG | SHO | IP | H | R | ER | HR | BB | K | ERA | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1998 | 26 | 24 | 12 | 8 | 0 | 5 | 0 | 153 | 159 | 88 | 82 | 18 | 40 | 132 | 4.82 | 1.30 | |
| 1999 | 26 | 26 | 9 | 8 | 0 | 1 | 1 | 149 | 160 | 86 | 81 | 16 | 44 | 130 | 4.89 | 1.37 | |
| 2000 | 26 | 25 | 11 | 7 | 0 | 0 | 0 | 134.1 | 170 | 98 | 90 | 17 | 42 | 116 | 6.03 | 1.58 | |
| 2001 | Red Sox | 20 | 2 | 0 | 2 | 0 | 0 | 0 | 41.2 | 54 | 27 | 27 | 1 | 21 | 27 | 5.83 | 1.80 |
| 2001 | 19 | 14 | 6 | 7 | 0 | 0 | 0 | 89 | 93 | 55 | 53 | 10 | 27 | 79 | 5.36 | 1.35 | |
| 2002 | Expos | 4 | 3 | 1 | 0 | 0 | 0 | 0 | 20.1 | 18 | 2 | 2 | 0 | 7 | 11 | .890 | 1.23 |
| 2002 | Red Sox | 15 | 2 | 2 | 0 | 0 | 0 | 0 | 29 | 34 | 24 | 24 | 5 | 7 | 18 | 7.45 | 1.41 |
| 2002 | 15 | 15 | 7 | 2 | 0 | 2 | 1 | 89 | 63 | 29 | 22 | 6 | 32 | 65 | 2.22 | 1.07 | |
| 2003 | Expos | 4 | 3 | 0 | 1 | 0 | 0 | 0 | 14 | 24 | 13 | 13 | 6 | 8 | 5 | 8.36 | 2.29 |
| 2003 | 22 | 22 | 10 | 8 | 0 | 3 | 2 | 132.1 | 147 | 83 | 74 | 18 | 53 | 83 | 5.03 | 1.51 | |
| 2004 | Expos | 43 | 17 | 4 | 6 | 0 | 0 | 0 | 135.2 | 145 | 80 | 69 | 17 | 55 | 87 | 4.58 | 1.47 |
| 2005 | Rockies | 12 | 8 | 5 | 1 | 0 | 1 | 1 | 53.1 | 56 | 26 | 25 | 7 | 13 | 38 | 4.22 | 1.29 |
| 2005 | Nationals | 12 | 2 | 1 | 2 | 0 | 0 | 0 | 29.1 | 41 | 20 | 20 | 3 | 8 | 17 | 6.14 | 1.67 |
| 2005 | 9 | 9 | 4 | 2 | 0 | 0 | 0 | 49 | 46 | 23 | 15 | 4 | 15 | 38 | 2.76 | 1.24 | |
| 2006 | Reds | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 6.2 | 7 | 4 | 4 | 3 | 0 | 4 | 5.40 | 1.05 |
| 2006 | Rockies | 6 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 17 | 15 | 15 | 2 | 8 | 4 | 19.29 | 3.57 |
| 2006 | 8 | 1 | 0 | 1 | 0 | 0 | 0 | 13.2 | 24 | 19 | 19 | 5 | 8 | 8 | 12.51 | 2.34 | |
| 2007 | 25 | 18 | 8 | 8 | 0 | 1 | 1 | 118.1 | 131 | 77 | 64 | 11 | 35 | 88 | 4.87 | 1.40 | |
| Career Total | 118 | 38 | 13 | 13 | 0 | 1 | 1 | 337 | 396 | 211 | 199 | 44 | 127 | 211 | 5.31 | 1.55 | |
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