The Heat played without NBA MVP LeBron James, who was out with "general soreness," according to coach Erik Spoelstra.
Josh Harrelson's 3-pointer with 1:01 remaining put the Heat ahead for good at 102-99. Harrelson finished with 10 points.
Dwyane Wade scored 13 for Miami and sat out most of the second half.
Gary Neal made a 3-pointer with 3:00 remaining in the third to give San Antonio an 84-74 lead.
Spurs star Tim Duncan finished with 15 points and six rebounds while playing only in the first and third quarters.
Mike Miller hit all three of his 3-point attempts in the second quarter to help Miami build its biggest lead of the first half at 57-46.
Former Celtics forward Glen "Big Baby" Davis recalls the story of when he was knocked out by an elbow from Dwight Howard.
Tom Haberstroh shows that the problem is that Golden State's looks are simply just not going in.
Tom Haberstroh shows that the problem is they're just not going in.