Gordon Hayward suffered severe broken left ankle just over five minutes into his first game with the Boston Celtics.
The incident came in the first quarter when Hayward went toward the basket and jumped to catch a lob pass. There was only minimal contact, and Hayward seemingly just landed awkwardly on his left leg when it broke.
Video of the injury can be found below.
The sound could be heard over the television broadcast, and it was immediately obvious that Hayward had broken his leg just above his left ankle.
A hush immediately fell over the crowd, and players were shown with shocked looks on their faces while other players were seen praying.
Hayward was placed in an air cast and taken off in a stretcher in obvious pain.
Here is the video, via TNT.
WARNING: VIDEO CONTAINS GRAPHIC CONTENT.