Duke extended its lead with another 7-0 burst, with freshman RasheedSulaimon scoring a pair of driving baskets before Cook's 3 that appeared to have Duke in control.
RasheedSulaimon had 16 points and Curry finished with 15 for the Blue Devils, who won the tournament the last three times it was played in Greensboro in 2006, 2010 and 2011.
Plumlee finished with his usual big numbers 18 points, 11 rebounds while Quinn Cook scored 18 points and RasheedSulaimon finished with 13 for the Blue Devils (22-2, 9-2 Atlantic Coast Conference).