The Nationals have called up John Lannan to start the first game of today's doubleheader against the Marlins. No corresponding roster move was necessary because of a new rule that allows teams to carry 26 players on the active roster for doubleheaders. Also, Bryce Harper is sitting out Game 1 with Jayson Werth starting in center field. For the Nationals: SS Danny Espinosa 2B Steve Lombardozzi 3B Ryan Zimmerman CF Jayson Werth 1B Adam LaRoche LF Tyler Moore RF Mark DeRosa C Jesus Flores P John Lannan Update: Michael Morse is out of the starting lineup for game one of the doubleheader because of a stomach bug. Davey Johnson said he hopes Morse will feel well enough to play in the nightcap.