Derrick Jones Jr. got off to another flying start Sunday, thrilling the crowd inside the Cox Pavilion with a series of highlight-reel dunks in his first action of the Las Vegas Summer League.
Airplane Mode, though, is now grounded.
The Heat's 21-year-old small forward badly sprained his right ankle after he landed awkwardly with about two minutes and 30 seconds left in the opening quarter against the Charlotte Hornets.
Jones Jr., who signed a two-year minimum deal with the Heat to join the 15-man roster a week ago, could not put any weight on his ankle as he was being helped off the court by Miami's training staff.