- Born: 1984/08/10
- Age: 28
- Height: 6-2
- Weight: 195
- Bats/Throws: B / R
- Seasons: 0
- Place of birth: Houston, TX
- Drafted by: the Washington Nationals in 2002 (1st round)
| Year | Team | G | GS | W | L | SV | CG | SHO | IP | H | R | ER | HR | BB | K | ERA | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2003 | 10 | 10 | 2 | 4 | 0 | 0 | 0 | 54 | 49 | 26 | 25 | 4 | 35 | 50 | 4.17 | 1.56 | |
| 2004 | 17 | 17 | 7 | 3 | 0 | 1 | 1 | 90.1 | 67 | 29 | 25 | 3 | 21 | 103 | 2.49 | .970 | |
| 2005 | 7 | 7 | 0 | 1 | 0 | 0 | 0 | 16 | 18 | 9 | 6 | 0 | 8 | 15 | 3.38 | 1.63 | |
| 2006 | 20 | 19 | 5 | 10 | 0 | 0 | 0 | 90 | 96 | 69 | 60 | 11 | 53 | 92 | 6.00 | 1.66 | |
| 2007 | 38 | 12 | 4 | 10 | 2 | 0 | 0 | 97.1 | 102 | 62 | 52 | 8 | 56 | 78 | 4.81 | 1.62 | |
| 2008 | 30 | 1 | 4 | 2 | 3 | 0 | 0 | 69.1 | 74 | 41 | 37 | 7 | 30 | 75 | 4.80 | 1.50 | |
| 2009 | 13 | 0 | 3 | 0 | 2 | 0 | 0 | 20 | 14 | 4 | 2 | 2 | 5 | 26 | 0.90 | .950 | |
| 2010 | 26 | 0 | 3 | 1 | 2 | 0 | 0 | 35 | 46 | 28 | 27 | 3 | 21 | 37 | 6.94 | 1.91 | |
| 2011 | 40 | 0 | 0 | 1 | 5 | 0 | 0 | 48.2 | 32 | 18 | 14 | 2 | 20 | 56 | 2.59 | 1.07 | |
| 2012 | 12 | 1 | 2 | 1 | 1 | 0 | 0 | 19.1 | 21 | 9 | 9 | 0 | 12 | 23 | 4.19 | 1.71 |
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