Spanish third seed Garbine Muguruza finished strongly to see off Duan Yingying in the second round at the US Open.
Duan provided a stern challenge in the first set but Wimbledon champion Muguruza seized control to win 6-4, 6-0 at Flushing Meadows on Wednesday.
Muguruza blitzed Duan in the second set, breaking on three occasions and winning the final nine games, to set up a meeting with Magdalena Rybarikova in the round of 32.
World No. 1 hopeful Muguruza looked below her best early, sluggish and slow off the mark as she fended off a break point in the sixth game.
The Spaniard found her rhythm as she increased the tempo of the match, eventually enjoying success on Duan's serve to break for a 5-4 lead.
Muguruza then consolidated as she closed out the first set, which proved to be a little more difficult than expected.
It deflated Duan after a spirited first set, with the Chinese broken immediately in the second.
Duan continued to go for her ground strokes, playing an aggressive game from the baseline, but she was unable to prevent a dramatic shift in momentum as Muguruza broke to love.
And Muguruza raced away with the match, reaching the US Open third round for the first time in her career.
Wozniacki out of US Open
Danish fifth seed Caroline Wozniacki became the fourth top-10 woman to exit the US Open after just two rounds on Wednesday when she lost 6-2, 6-7 (5/7), 6-1 to Russia's Ekaterina Makarova.
Former world number one Wozniacki, the runner-up in 2009 and 2014, had won all seven of her previous meetings against left-hander Makarova.
She joins second seed Simona Halep, sixth-seeded defending champion Angelique Kerber and Britain's Johanna Konta, the seventh seed, in crashing out of the tournament.
Makarova, a semi-finalist in 2014, will face Spain's Carla Suarez Navarro for a place in the last 16.
STATISTICAL BREAKDOWN
Muguruza [3] bt Duan 6-4 6-0
WINNERS/UNFORCED ERRORS
Muguruza - 15/16
Duan - 12/27
ACES/DOUBLE FAULTS
Muguruza - 6/1
Duan - 0/2
BREAK POINTS WON
Muguruza - 4/6
Duan - 0/1
FIRST SERVE PERCENTAGE
Muguruza - 77
Duan - 66
PERCENTAGE OF POINTS WON ON FIRST/SECOND SERVE
Muguruza - 74/46
Duan - 55/41
TOTAL POINTS
Muguruza - 63
Duan - 43
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