Chad Tracy becomes the latest Nationals player to suffer an injury, forcing the club to promote hot-hitting outfielder Corey Brown from Syracuse.
Chien-Ming Wang is now the Nationals' fifth starter as Ross Detwiler will move to the bullpen.
Add another catcher injury to the list as Jesus Flores left last night's game in Atlanta.
Gio Gonzalez gave up only one hit in seven innings and the Nationals beat the struggling Atlanta Braves 7-2 on Sunday night to complete a three-game sweep.
The Nats are trying to pull off a sweep on Sunday Night Baseball from Turner Field. Follow all the action with our Live game thread.