HOUSTON — This is more like it for Coach K and Duke. The top-seeded Blue Devils returned to the round of eight for the first time since 2004, with Kyle Singler and Jon Scheyer helping them pull away in the second half Friday night for a 70-57 win over Purdue in the South Regional semifinals. Singler scored 24 points and Scheyer added 18, snapping out of a shooting slump just in time. Duke (32-5) will play third-seeded Baylor in Sunday's regional final after clearing a nagging hurdle that had some wondering if the mighty program was losing its edge. The Blue Devils had lost in the round of 16 in three of the past five seasons, but now stand one victory from their 11th Final Four appearance under coach Mike Krzyzewski. Duke kept marching through the NCAA tournament while other favorites are falling by the wayside.