| Year | Team | W | L | G | IP | ERA | WHIP | K | BB | HR | K/9 | BB/9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2007 | Washington Nationals | 2 | 2 | 6 | 34.2 | 4.15 | 1.53 | 10 | 17 | 3 | 2.60 | 4.41 |
| 2008 |
| Washington Nationals |
| 9 |
| 15 |
| 31 |
| 182.0 |
| 3.91 |
| 1.34 |
| 117 |
| 72 |
| 23 |
| 5.79 |
| 3.56 |
| 2009 | Washington Nationals | 9 | 13 | 33 | 206.1 | 3.88 | 1.35 | 89 | 68 | 22 | 3.88 | 2.97 |
| 2010 | Washington Nationals | 8 | 8 | 25 | 143.1 | 4.65 | 1.56 | 71 | 49 | 14 | 4.46 | 3.08 |
| 2011 | Washington Nationals | 10 | 13 | 33 | 184.2 | 3.70 | 1.46 | 106 | 76 | 15 | 5.17 | 3.70 |
| 2012 | Washington Nationals | 4 | 1 | 6 | 32.2 | 4.13 | 1.44 | 17 | 14 | 0 | 4.68 | 3.86 |
| 2013 | Philadelphia Phillies | 3 | 6 | 14 | 74.1 | 5.33 | 1.52 | 38 | 27 | 6 | 4.60 | 3.27 |
| 2014 | New York Mets | 1 | 0 | 5 | 4.0 | 15.75 | 2.25 | 2 | 2 | 3 | 4.50 | 4.50 |
| Career | — | 46 | 58 | 153 | 862.0 | 4.18 | 1.44 | 450 | 325 | 86 | 4.70 | 3.39 |
