ATLANTA — North Carolina is still unbeaten.

Barely.

Tyler Hansbrough scored 27 points and made a crucial block in the closing seconds as the top-ranked Tar Heels held on for an 83-82 victory over stubborn Georgia Tech on Wednesday night.

Danny Green put North Carolina (18-0, 3-0 Atlantic Coast Conference) ahead by making one of two free throws with 22 seconds remaining.

Georgia Tech (7-9, 0-3) had a chance to pull off a monumental upset, but Zack Peacock's shot was blocked by Hansbrough. Peacock retrieved the loose ball and got off a jumper that rimmed out, allowing North Carolina to escape.