North Carolina vs. Duke

Head coach Mike Krzyzewski watches Zion Williamson of the Duke Blue Devils react after falling as his shoe breaks against Luke Maye of the North Carolina Tar Heels during their game at Cameron Indoor Stadium on Wednesday, Feb. 20, 2019, in Durham, N.C.

Duke's Zion Williamson sits on the floor following a injury during the first half of an NCAA college basketball game against North Carolina in Durham, N.C., Wednesday, Feb. 20, 2019.

Duke's Zion Williamson (1) is attended to on the bench following an injury during the first half of an NCAA college basketball game against North Carolina in Durham, N.C., Wednesday, Feb. 20, 2019.

Duke's Zion Williamson (1) falls to the floor with an injury while chasing the ball with North Carolina's Luke Maye (32) during the first half of an NCAA college basketball game in Durham, N.C., Wednesday, Feb. 20, 2019.

Former President Barack Obama joins fans while the national anthem is played during an NCAA college basketball game between Duke and North Carolina in Durham, N.C., Wednesday, Feb. 20, 2019.

Fans of the Duke Blue Devils watch on before their game against the North Carolina Tar Heels at Cameron Indoor Stadium on Wednesday, Feb. 20, 2019, in Durham, N.C.

Fans of the Duke Blue Devils watch on before their game against the North Carolina Tar Heels at Cameron Indoor Stadium on Wednesday, Feb. 20, 2019, in Durham, N.C.

Fans of the Duke Blue Devils watch on before their game against the North Carolina Tar Heels at Cameron Indoor Stadium on Wednesday, Feb. 20, 2019, in Durham, N.C.

Zion Williamson of the Duke Blue Devils warms up before their game against the North Carolina Tar Heels at Cameron Indoor Stadium on Wednesday, Feb. 20, 2019, in Durham, N.C.

Fans of the Duke Blue Devils watch on before their game against the North Carolina Tar Heels at Cameron Indoor Stadium on Wednesday, Feb. 20, 2019, in Durham, N.C.

Zion Williamson of the Duke Blue Devils warms up before their game against the North Carolina Tar Heels at Cameron Indoor Stadium on Wednesday, Feb. 20, 2019, in Durham, N.C.

Duke's Javin DeLaurier and Tre Jones guard North Carolina's Garrison Brooks during the first half of an NCAA college basketball game in Durham, N.C., Wednesday, Feb. 20, 2019.

Former President Barack Obama joins fans during an NCAA college basketball game between Duke and North Carolina in Durham, N.C., Wednesday, Feb. 20, 2019.

North Carolina's Cameron Johnson dunks against Duke during the first half of an NCAA college basketball game in Durham, N.C., Wednesday, Feb. 20, 2019.

Duke's Marques Bolden and Tre Jones guard North Carolina's Coby White during the first half of an NCAA college basketball game in Durham, N.C., Wednesday, Feb. 20, 2019.

Teammates RJ Barrett and Marques Bolden of the Duke Blue Devils watch as Zion Williamson of the Duke Blue Devils reacts after falling as his shoe breaks against Luke Maye of the North Carolina Tar Heels during their game at Cameron Indoor Stadium on Wednesday, Feb. 20, 2019, in Durham, N.C.

RJ Barrett of the Duke Blue Devils watches as Cameron Johnson of the North Carolina Tar Heels drives to the basket during their game at Cameron Indoor Stadium on Wednesday, Feb. 20, 2019, in Durham, N.C.

Fans watch as Luke Maye of the North Carolina Tar Heels waits to throw the ball inbounds against the Duke Blue Devils during their game at Cameron Indoor Stadium on Wednesday, Feb. 20, 2019, in Durham, N.C.

A detailed view of the shoe worn by Zion Williamson of the Duke Blue Devils against the North Carolina Tar Heels during their game at Cameron Indoor Stadium on Wednesday, Feb. 20, 2019, in Durham, N.C.