Duke was the ACC's preseason favorite, and North Carolina was the defending national champion.
The conference leader and highest-ranked team so far: Virginia.
Picked to finish sixth in the ACC preseason poll, the Cavaliers have been the conference's most consistent team this season behind their still-stifling defense.
Virginia (15-1, 4-0 ACC) moved up a spot to No. 2 and received a first-place vote in the AP Top 25 released on Monday, its highest ranking since reaching No. 2 in the 2014-15 season.
The Cavaliers, No. 1 in KenPom.com's defensive efficiency rankings, beat Syracuse and North Carolina State last week.