Top prospect Andrew Heaney - the best lefty starter in the minor leagues - has been called up to make his major league debut on Thursday against the Mets.
This week will see Gio Gonzalez return and the Atlanta Braves come to town for four games.
The Nationals continued to struggle scoring runs in their 5-2 loss to the St. Louis Cardinals, finishing their road trip with four straight losses.
Ryan Zimmerman started at first base on Sunday as the Nationals lost their fourth straight game to the Cardinals.
The Nationals have lost 10 of their last 12 to the Cardinals, including five straight at Busch Stadium. Can they get over this mental hurdle?