| Year | Team | G | GS | W | L | SV | CG | SHO | IP | H | R | ER | HR | BB | K | ERA | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1996 | 7 | 5 | 5 | 2 | 0 | 0 | 0 | 33.2 | 41 | 26 | 21 | 3 | 3 | 23 | 5.61 | 1.31 | |
| 1997 | 14 | 14 | 7 | 2 | 0 | 0 | 0 | 92 | 82 | 26 | 22 | 2 | 23 | 92 | 2.15 | 1.14 | |
| 1998 | 18 | 17 | 5 | 8 | 0 | 0 | 0 | 100 | 142 | 89 | 61 | 5 | 32 | 69 | 5.49 | 1.74 | |
| 1999 | 5 | 4 | 1 | 1 | 0 | 0 | 0 | 16.2 | 20 | 10 | 7 | 1 | 4 | 17 | 3.78 | 1.44 | |
| 2000 | 13 | 13 | 9 | 3 | 0 | 1 | 1 | 85.1 | 72 | 29 | 18 | 6 | 31 | 101 | 1.90 | 1.21 | |
| 2001 | 22 | 22 | 9 | 10 | 0 | 2 | 0 | 136.2 | 123 | 57 | 47 | 8 | 45 | 94 | 3.10 | 1.23 | |
| 2002 | Expos | 19 | 2 | 4 | 1 | 1 | 0 | 0 | 37.1 | 28 | 18 | 15 | 3 | 15 | 25 | 3.62 | 1.15 |
| 2002 | 17 | 16 | 5 | 6 | 0 | 1 | 0 | 90 | 77 | 38 | 35 | 5 | 32 | 68 | 3.50 | 1.21 | |
| 2003 | Expos | 23 | 23 | 9 | 8 | 0 | 1 | 1 | 131.1 | 132 | 64 | 61 | 8 | 59 | 61 | 4.18 | 1.45 |
| 2003 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 2.1 | 3 | 3 | 1 | 0 | 1 | 3 | 3.86 | 1.71 | |
| 2004 | Expos | 19 | 19 | 5 | 10 | 0 | 1 | 1 | 116.2 | 117 | 53 | 51 | 13 | 45 | 61 | 3.93 | 1.39 |
| 2005 | Rockies | 5 | 3 | 0 | 1 | 0 | 0 | 0 | 11.1 | 20 | 11 | 9 | 2 | 7 | 7 | 7.15 | 2.38 |
| 2005 | Nationals | 12 | 5 | 1 | 2 | 0 | 0 | 0 | 36 | 41 | 29 | 27 | 4 | 25 | 16 | 6.75 | 1.83 |
| 2005 | 3 | 3 | 1 | 0 | 0 | 0 | 0 | 13 | 14 | 4 | 4 | 1 | 1 | 10 | 2.77 | 1.15 | |
| 2006 | Nationals | 5 | 5 | 1 | 3 | 0 | 0 | 0 | 26.2 | 29 | 15 | 14 | 2 | 11 | 13 | 4.73 | 1.50 |
| 2006 | Rockies | 3 | 3 | 1 | 2 | 0 | 0 | 0 | 13.1 | 22 | 17 | 16 | 3 | 10 | 6 | 10.80 | 2.40 |
| 2006 | 8 | 8 | 2 | 5 | 0 | 0 | 0 | 40 | 51 | 32 | 30 | 5 | 21 | 19 | 6.75 | 1.80 | |
| 2007 | 11 | 9 | 1 | 1 | 0 | 0 | 0 | 36.2 | 34 | 25 | 16 | 2 | 26 | 11 | 3.93 | 1.64 | |
| 2008 | 6 | 0 | 1 | 0 | 0 | 0 | 0 | 8 | 14 | 6 | 5 | 0 | 1 | 3 | 5.63 | 1.88 | |
| Career Total | 86 | 60 | 21 | 27 | 1 | 2 | 2 | 372.2 | 389 | 207 | 193 | 35 | 172 | 189 | 4.66 | 1.51 | |
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