(Alex Brandon /AP)

The Nationals last played at Busch Stadium in the playoffs last October. Tonight, they’ll ope a series here with their postseason hopes alive in a strictly mathematical sense. Tanner Roark (7-0, 1.08 ERA) will try to keep his perfect record going against Cardinals ace Adam Wainwright. The Cardinals swept the Nationals in Washington back in April, and the Nationals will try for revenge as the Cardinals try to lock up the NL Central. Talk about the game right here.