CHAPEL HILL, N.C. (AP) Mike Krzyzewski said this week No. 3 Duke would never be a great team. The coach of the youthful Blue Devils may have to rethink that following a 90-86 overtime victory at North Carolina on Thursday night.Duke (17-2, 8-0 Atlantic Coast Conference) blew a 19-point second-half lead, but got 25 points from Shane Battier, 23 from Chris Carrawell and seven from Carlos Boozer in the overtime to beat the Tar Heels (13-9, 4-4) as it extended its own record with its 30th straight ACC regular-season victory.