We know what Flagg can do but with Brown, UNC found out first hand on Saturday. When Brown entered the game in the second half with UNC up seven, Duke went on a big run. He essentially took RJ Davis out of the game with his length and he's an issue on switches for guards.

Duke freshman Cooper Flagg appeared to injure his left ankle after slipping under the basket and was helped to the locker room by two teammates late in the first half. He did not return.

Duke beat Georgia Tech, and UNC won against Wake Forest, which set up a third matchup between the two Carolina teams this season. This time, it will be at the ACC Tournament semi-finals. Duke, North Carolina set for semifinal matchup after busy afternoon inside the Spectrum Center Duke guard/forward Isaiah Evans led a second-half comeback.