| Year | Team | G | GS | W | L | SV | CG | SHO | IP | H | R | ER | HR | BB | K | ERA | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2001 | 11 | 0 | 0 | 0 | 2 | 0 | 0 | 12 | 8 | 2 | 2 | 1 | 5 | 18 | 1.50 | 1.08 | |
| 2002 | 23 | 0 | 2 | 2 | 6 | 0 | 0 | 29.2 | 13 | 6 | 5 | 2 | 19 | 36 | 1.52 | 1.08 | |
| 2003 | 49 | 0 | 9 | 2 | 4 | 0 | 0 | 82.1 | 68 | 29 | 26 | 5 | 47 | 81 | 2.84 | 1.40 | |
| 2004 | 32 | 0 | 2 | 2 | 11 | 0 | 0 | 48.1 | 39 | 13 | 13 | 3 | 17 | 51 | 2.42 | 1.16 | |
| 2005 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 1 | 1 | 0 | 0 | 3 | 9.00 | 2.00 | |
| 2006 | Nationals | 21 | 0 | 0 | 2 | 0 | 0 | 0 | 28.1 | 23 | 21 | 20 | 7 | 15 | 39 | 6.35 | 1.34 |
| 2006 | 9 | 0 | 2 | 0 | 1 | 0 | 0 | 14.1 | 18 | 9 | 8 | 2 | 6 | 13 | 5.02 | 1.67 | |
| 2007 | Nationals | 37 | 0 | 2 | 3 | 0 | 0 | 0 | 45.1 | 36 | 19 | 16 | 2 | 15 | 43 | 3.18 | 1.13 |
| 2007 | 26 | 0 | 2 | 2 | 1 | 0 | 0 | 33 | 23 | 8 | 6 | 0 | 18 | 45 | 1.64 | 1.24 | |
| 2008 | Nationals | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 5 | 6 | 3 | 3 | 2 | 6 | 3 | 5.40 | 2.40 |
| 2008 | 43 | 0 | 5 | 4 | 8 | 0 | 0 | 45.1 | 48 | 21 | 20 | 3 | 20 | 55 | 3.97 | 1.50 | |
| 2009 | 45 | 1 | 3 | 1 | 3 | 0 | 0 | 56.2 | 36 | 20 | 14 | 4 | 37 | 46 | 2.22 | 1.29 | |
| 2010 | 10 | 0 | 1 | 0 | 0 | 0 | 0 | 17.1 | 28 | 17 | 17 | 2 | 9 | 9 | 8.83 | 2.13 | |
| Career Total | 62 | 0 | 2 | 5 | 0 | 0 | 0 | 78.2 | 65 | 43 | 39 | 11 | 36 | 85 | 4.46 | 1.28 | |
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