(Jeff Roberson / AP)

The Nationals are tied with the Phillies for second in the NL East at 49-53 and two games ahead of the Mets. The Nationals also sit eight games behind the Braves. In the first game of the doubleheader, the Nationals send Jordan Zimmermann (12-5, 3.01 ERA) to the mound after his shortest start of his career. He will face rookie Jenrry Mejia, who is making his season debut. The lineups are here. As always, talk about the game here.