Mason Plumlee had 18 points and 11 rebounds, and No. 2 Duke beat North Carolina, 73-68, in Durham, N.C.
Quinn Cook added 18 points for the Blue Devils (22-2, 9-2 Atlantic Coast Conference), who shot 44 percent — 52 percent after halftime.
P.J. Hairston scored 20 points, and Reggie Bullock had 15 points with four 3-pointers for North Carolina (16-8, 6-5), which led for the first 26 minutes but went on to lose its second straight.
The Tar Heels’ 13-of-23 free-throw accuracy was accentuated by 3-of-10 shooting during a critical late stretch. They fell to 1-4 this season against ranked foes.