Junior Michael Callahan scored in the 13th minute and Tar Heel defense limited Duke to just six shots to earn the victory.
With the win, the Carolina advances to Friday's semifinals against top-ranked Wake Forest.
With a 7-7-5 record, UNC must beat Wake or lose in a shootout to be assured of finishing with a record of .500 or better and therefore be eligible for consideration for an NCAA Tournament bid.
"[The ACC Tournament] is the vehicle to the NCAA Tournament for us,"
said Callahan. "Tonight was a must-win. Friday is a must-win. And
obviously we always want to win the ACC Championship. It's a huge