Tatum hit three 3-pointers as the shot clock expired in the second half, all of them after a 5-0 spurt pulled Virginia to within a single point.
ACC Player of The Year candidate Luke Kennard added 16 points for the suddenly surging Blue Devils, who pulled into a second place tie with Louisville and Florida State. Just a game behind league leading North Carolina.
In perhaps their best defensive effort of the year Duke grabbed 23 defensive rebounds and forced several shot-clock violations.
The Blue Devils will turn their attention to a Wake Forest team that took them to the wire in Winston-Salem last month. Only a perfect second half effort from Kennard allowed the Blue Devils to escape with a win. The first of their current six game streak.