Zion Williamson has been diagnosed with a Grade 1 right knee sprain.

Williamson will be day-to-day.

Williamson suffered the injury during the opening minute of Duke's loss on Wednesday to North Carolina.

Ticket prices for Wednesday's game between Duke and North Carolina have reached amounts typically reserved for Super Bowls.

The cheapest available tickets for Cameron Indoor Stadium is $2,500.

One ticket to this week's UNC-Duke game sold for $10,652, per Vivid Seats. 

Duke is ranked No. 1 while North Carolina ranks No. 8 with the presence of Zion Williamson, R.J. Barrett and Cam Reddish adding more intrigue to the rivalry game.

"Between Zion Williamson, a No. 1 ranking and this being one of the biggest rivalries in sports, there's intense demand," TickPick marketing strategist Kyle Zorn said. "There's also a limited supply of inventory, which is having a major effect on price. Cameron Indoor Stadium has 13 percent the seating capacity of Mercedes-Benz Stadium. When you factor in that the floor seating is reserved for students, you're left with a short supply -- and massive demand."