Nationals Roster & Staff
Transactions
| Date | Transaction |
| 01/29/10 | Washington Nationals signed free agent RHP Miguel Batista to a minor league contract and invited him to spring training. |
| 01/28/10 | Washington Nationals signed free agent RHP Tyler Walker. |
| 01/28/10 | Washington Nationals designated RHP Marco Estrada for assignment. |
| 01/26/10 | Washington Nationals signed free agent LF Kevin Mench. |
| 01/25/10 | Washington Nationals invited non-roster C Derek Norris to spring training. |
| 01/25/10 | Washington Nationals invited non-roster RHP Drew Storen to spring training. |
| 01/25/10 | Washington Nationals signed free agent Chuck James. |
| 01/19/10 | Washington Nationals signed free agent LF Chris Duncan to a minor league contract and invited him to spring training. |
| 01/08/10 | Washington Nationals invited non-roster LHP Victor Garate to spring training. |
| 01/08/10 | Washington Nationals sent Victor Garate outright to Syracuse Chiefs. |
| 01/06/10 | Washington Nationals signed free agent Matt Capps. |