| Start Date | End Date | #Days | Status | MLB Team | Minor Team | 40-Man | Transaction Description |
| 2013-05-17 | Current | -- | Minors | Washington Nationals | Syracuse (AAA) | Yes | Activated from DL |
| 2013-04-19 | 2013-05-17 | 29 | DL-7 | Washington Nationals | Syracuse (AAA) | Yes | DL-7 Injured |
| 2013-03-18 | 2013-04-19 | 33 | Minors | Washington Nationals | Syracuse (AAA) | Yes | Optioned to Syracuse (AAA) |
| 2013-03-07 | 2013-03-18 | 12 | Active | Washington Nationals | Yes | Signed to 1-year contract for 2013 ($0m) | |
| 2012-09-05 | 2013-03-07 | 184 | Active | Washington Nationals | Yes | Recalled from Syracuse (AAA) | |
| 2012-07-31 | 2012-09-05 | 37 | Minors | Washington Nationals | Syracuse (AAA) | Yes | Optioned to Syracuse (AAA) |
| 2012-07-23 | 2012-07-31 | 9 | Active | Washington Nationals | Yes | Recalled from Syracuse (AAA) | |
| 2012-06-01 | 2012-07-23 | 53 | Minors | Washington Nationals | Syracuse (AAA) | Yes | Optioned to Syracuse (AAA) |
| 2012-05-28 | 2012-06-01 | 5 | Active | Washington Nationals | Yes | Contract purchased from Syracuse (AAA) |
| Date | Notes |
| 2010-12-16 | Traded by Athletics with Henry Rodriguez to Nationals for Josh Willingham |
| Drafted: Selected by Oakland Athletics in 1st round (59th overall) of 2007 Amateur Draft (June-Reg Phase) | |