The Rockets broke the game open in the second quarter, owned a 19-point advantage at the half and were not threatened during the closing two periods.
Houston shot 43 percent, but Phoenix hit a mere 40 percent of its field goal attempts and converted nine free throws while settling for a long series of jump shots.
Marcin Gortat led Phoenix with 15 points and 12 rebounds. It was the fifth loss in seven games for the Suns.
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