Donte DiVicenzo beat the buzzer on a tip-in to lead No. 1
"I was like, 'Wait a minute, I thought I missed it,' " Hart said.
Hart realized then who made the winner.
"I saw everyone running to 'Te, I just started running to 'Te, too," Hart said.
Jalen Brunson and Mikal Bridges each scored 15 points for the Wildcats. Ty Jerome led Virginia (16-4) with 15 points.
The Wildcats played nothing like the defending national champions for most of the first 30 minutes. They missed 18 of 22 shots, including nine of 10 three-point shots.
Hart made his first basket of the game with 7 minute 52 seconds to play, a three-pointer that cut the Villanova deficit to 49-42. DiVincenzo came up with a steal and fed Kris Jenkins, who made a three-pointer that pulled the Wildcats to within four points.
The Cavaliers shot 46% from the field but could not stay out of foul trouble. The Wildcats made 13 of 14 free throws (Virginia was three for three) that kept the halftime deficit to 31-22.
at No. 19
at No. 13 UCLA 69, Arizona 49: Kari Korver made a career-high six three-pointers in scoring a career-best 24 points to lead the Bruins (17-4, 8-2