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.
Marc Spears says he texted DeMarcus Cousins after he tweeted following the Kings drafting Greek center Georgios Papagiannis and Cousins told him the tweet had to do with a yoga class he was taking.
Chandler Parsons is 'all ears' as he enters free agency, sources told ESPN, while the Mavericks are prioritizing other potential targets.
Jemele Hill thinks it's only natural for Knicks fans to think Kevin Durant is coming to New York because Knicks fans think all free agents want to play from them.