Halep, who battled back to beat U.S. college champion Danielle Collins in the opening round after losing a first-set tie-breaker, wasted little time as temperatures soared on a hazy day in Flushing Meadows.
"I started a little bit too slow, but then I started to be more aggressive and hit the ball," said world number two Halep. "I feel great now that I could win so fast today because it's so hot outside."
Halep, the French Open runner-up, will next meet either Shahar Peer of Israel or Croatian Mirjana Lucic-Baroni.
(Reporting by Larry Fine; Editing by Frank Pingue)
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