Luka Doncic left the Dallas Mavericks' game against the Miami Heat in the first quarter after spraining his ankle. X-rays on Doncic's ankle returned negative as he did not return to the game. 

Doncic was diagnosed with a moderate right ankle sprain, league sources told Adrian Wojnarowski of ESPN.

Rick Carlisle added that he does not expect Doncic to be available for Monday night's game against the Bucks. 

Doncic is averaging 30.4 points, 9.9 rebounds and 9.3 assists per game this season.