Antoine Walker, Gary Payton and Dorell Wright each had 14 points for the Heat, who were playing without Shaquille O'Neal (strained left calf). Payton also had a game-high eight assists in 26 minutes, and Udonis Haslem had 10 rebounds in 26 minutes.
Wright scored 12 of his points in the fourth quarter, including three dunks. His slams that finished consecutive fast breaks gave Miami an 80-74 lead with 6:50 left. Miami led the rest of the way.
Hill scored all of his points in the first half to help Orlando hold a 44-43 halftime edge.
Both teams are 2-2 in the preseason.