Quentin Richardson added 20 points for the Heat, who held of a fourth-quarter rally by the Trail Blazers and ended their two-game losing streak.
Miami led much of the way. An 11-point run late in the third quarter gave the Heat an 88-72 advantage.
Portland was able to narrow the gap to single digits with 4 minutes left in the game on a layup by Andre Miller, who scored 18 in the game. Jermaine O'Neal's jumper on the next possession put Miami up by 11. The Heat used free-throw shooting to seal the victory in the stretch.
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