RJ Barrett leads No. 1 Duke past No. 4 Virginia 72-70

Duke's Javin DeLaurier (12) and RJ Barrett (5) struggle for possession of the ball with Virginia's De'Andre Hunter, rear, during the first half of an NCAA college basketball game in Durham, N.C., Saturday, Jan. 19, 2019. (AP Photo/Gerry Broome)

Duke's Zion Williamson (1) reacts following a basket against Virginia during the first half of an NCAA college basketball game in Durham, N.C., Saturday, Jan. 19, 2019. (AP Photo/Gerry Broome)

Duke's Zion Williamson passes the ball while Virginia's Jack Salt and De'Andre Hunter, left, defend during the first half of an NCAA college basketball game in Durham, N.C., Saturday, Jan. 19, 2019. (AP Photo/Gerry Broome)

Duke's RJ Barrett reacts following a basket against Virginia during the second half of an NCAA college basketball game in Durham, N.C., Saturday, Jan. 19, 2019. Duke won 72-70. (AP Photo/Gerry Broome)

Virginia's De'Andre Hunter dunks against Duke's Jack White during the first half of an NCAA college basketball game in Durham, N.C., Saturday, Jan. 19, 2019. (AP Photo/Gerry Broome)

Duke's Jack White (41) and Zion Williamson (1) chase the ball with Virginia's De'Andre Hunter (12) during the first half of an NCAA college basketball game in Durham, N.C., Saturday, Jan. 19, 2019. (AP Photo/Gerry Broome)