The Nationals have promoted Bryce Harper to Double-A Harrisburg. Last year's No. 1 overall pick had been playing for Class-A Hagerstown. Harper was set to make his debut Monday night for the Harrisburg Senators of the Eastern League. The 18-year-old outfielder had been a hitting sensation at Class-A Hagerstown, ranking among league leaders with a .318 average along with 14 home runs, 46 RBIs and 19 stolen bases.