The Nationals turn to Gio Gonzalez (7-6, 3.72 ERA) to complete the sweep of the Marlins. It would be the Nationals first sweep since Aug. 9-11 when they took a three-game series from the Phillies. The Nationals have swept only four series this season, and one of those was a two-game set against the Tigers. Right-hander Tom Koehler (3-8, 4.45 ERA) takes the mound for the Marlins. The lineups are here. As always, discuss the game here.