On Tuesday night, about five minutes into the Celtics’ season opening game against the Cleveland Cavaliers, Gordon Hayward suffered a gruesome injury to his ankle.

Hayward landed hard on the court after an alley-oop attempt in the first quarter of the game. Players immediately called for medical attention when they saw the injury, because Hayward’s ankle and leg were turned in an odd direction. Medical personnel rushed onto the court, and Hayward was taken off on a stretcher.

Celtics coach Brad Stevens confirmed that Hayward had suffered a dislocated ankle and a fractured tibia. Hayward was taken back to Boston and straight to the hospital on Tuesday night.

This was Hayward’s debut game with the Celtics.