Al Behrman/AP

Dan Haren returns after missing 14 games and two starts on the disabled list, and hoping to salvage the second half of his season. The Nationals face old friend John Lannan for the second time this season. The first time the two met Lannan held down the Nationals to two runs over five innings in the no decision. The Nationals offense has averaged seven runs over the past eight games. The lineups are here. As always, discuss the game here.