Rookie Jaime Jaquez Jr. scored 31 points and got his first double-double, Bam Adebayo finished with 26 points and 15 rebounds and Miami held on to beat Philadelphia.
Heat coach Erik Spoelstra improved to 9-0 on Christmas, the best record in NBA history for head coaches on the holiday.
Tyler Herro scored 22 points, Duncan Robinson added 16 and Kyle Lowry had 12 for the Heat in what became his first Christmas win. Jaquez also grabbed 10 rebounds for Miami, which held a 56-36 edge on the boards.
Reigning MVP and two-time defending scoring champion Joel Embiid missed the game for Philadelphia because of an ankle sprain. Tobias Harris scored 27 points for the 76ers, and Kelly Oubre Jr. added 25. Mo Bamba scored 18, De’Anthony Melton had 15 and Tyrese Maxey — who shot 4 for 20 from the floor — finished with 12.