7:05, Citizens Bank Park. TV: Comcast SportsNet. Radio: WPHT (1210-AM); WUBA (1480-AM) Spanish.

Nationals LHP Ross Detweiler (0-0, 2.45) vs. Phillies LHP J.A. Happ (2-0, 2.60)

Nationals update: Detwiler is making his third big-league start in his fourth big-league game ... A Missouri State product, Detwiler is coming off an impressive performance against the Orioles in which he allowed one run on one hit in six innings, although he walked four in addition to striking out two ... Detwiler, 23, was the No. 6 overall pick in the 2007 draft ... The Nationals are hitting .269 as a team, ranked third out of all National League teams.

Phillies update: Happ is coming off a strong starting debut against the Yankees last Saturday, when he allowed two runs on four hits in six innings of a 5-4 loss ... Happ has allowed just two earned runs in his last 12 2/3 innings ... Happ has faced the Nationals four times in relief this season and hasn't allowed a run in 4 1/3 innings ... The Phillies are 8-14 at home this season.