LeBron James scored 19 points, roster hopeful Terrel Harris added 16 and the Heat outscored the Magic by 29 points over the game's final 27 minutes, cruising to a 118-85 victory in the preseason opener for both teams.
"The adrenaline and energy was certainly pumping early on," Heat coach Erik Spoelstra said. "Our starters set the tone. Then the young kids came in there and took advantage of the opportunity."
"It's good to be back," James said. "It's good to have our fans back."
The Magic allowed Miami to shoot 71 percent in the second half and 82 percent in the fourth quarter -- while making 31 percent of their own shots after halftime.
"When you have a team outscore you 22-0 on fast-break points, they're clearly playing at a pace and an energy level higher than what you are," Magic coach Stan Van Gundy said. "And we could not keep up."
The Heat scored 36 points in the fourth quarter, using mostly end-of-the-bench players.
"We practice against the best players in the world every day," rookie point guard Norris Cole said. "When we get out there and get to go against high competition, the work that gets put in shows."
The subject of trade talk throughout training camp, Dwight Howard finished with only five points on 2-of-9 shooting.
Afterward, Howard said his status is not a distraction for the Magic.
"They look like a seasoned team," Howard said. "We were off for seven months. And guys are trying to get back in to it. There's no need for us, anybody, Magic fans, whatever, to stress about the first game. There's a lot more games to be played."
Jason Richardson was the only Magic starter to reach double figures, scoring 11 points.
"I know in the grand scheme of things, preseason isn't a big deal," Magic forward Quentin Richardson said. "But I don't care if we're playing pickup. I don't want to lose by 40. That's just me."
The teams play again in Orlando on Wednesday.