The former longest-tenured player in the franchise faces his old teammates for the first time.
Roger Bernadina signed with the Phillies two days after the Nationals released.
Washington acquires veteran OF David DeJesus in exchange for a player to be named later and releases Roger Bernadina.
Roger Bernadina has started the season for 1 for 23, a slump that may extend to his playing in the WBC.
The backup outfielder reported to camp on Wednesday and wants to catch up after being away for nearly a month.
When Roger Bernadina returns from the WBC, Davey Johnson will have to find him at-bats to get ready for the season.
Test results on his wrist were negative, no broken bones after being hit by a pitch in a game Sunday.
The Nationals outfielder finishes 1 for 5 in a 5-0 upset win over South Korea in the opening round of the WBC.
The Nationals outfielder passed up a chance to play for his country in the 2009 World Baseball Classic but not this year.
The Nationals and the outfielder avoided arbitration with a deal that will pay his $1,212,500 for the 2013 season plus $130,000 in incentives.