Former President Barack Obama reacting to Zion Williamson's knee injury.

Former US President Barack Obama was courtside for what is being viewed as the pivotal moment in Wednesday night's highly anticipated men's college basketball matchup between No. 1 Duke and No. 8 North Carolina.

The Duke star Zion Williamson injured his right knee just 33 seconds into the contest when his left shoe exploded as he tried to cut with the basketball. He was taken to the locker room for evaluation and was ruled out for the rest of the game.

Here is Obama, who can be seen in the background saying "His shoe broke" immediately after the injury, via ESPN:

Here is a replay of the injury, which shows Williamson's shoe exploding.

    For more, go to Business Insider South Africa.

    Receive a single WhatsApp every morning with all our latest news: click here.

    Also from Business Insider South Africa: