NEW YORK —
Sixth-seeded Caroline Wozniacki, with boyfriend Rory McIlroy in the stands, held off qualifier Duan Ying-Ying to win 6-2, 7-5.
The 133rd-ranked Duan had a chance to serve out the second set at 5-3 in her Grand Slam debut. But the 2009 U.S. Open finalist broke back. Then Duan had a set point on Wozniacki’s serve that she couldn’t convert. Wozniacki broke serve in the next game, then staved off three break points to clinch the win.
No. 10-seeded Roberta Vinci, a quarterfinalist at Flushing Meadows last year, beat Timea Babos 6-4, 6-2. She’s reached a career-high ranking this summer at age 30 after making the round of 16 at the French Open and Wimbledon.
No. 13-seeded Ana Ivanovic and 14th-seeded Maria Kirilenko got off to quick starts, each winning in under an hour. Ivanovic, the 2008 French Open champ, beat Anna Tatishvili 6-2, 6-0. Kirilenko won 6-1, 6-1 against Yanina Wickmayer, a semifinalist at Flushing Meadows four years ago whose ranking has fallen to 57th.
Christina McHale, a 21-year-old from Englewood Cliffs, N.J., snapped a five-match losing streak by beating 45th-ranked Julia Goerges 6-4, 6-3. McHale’s ranking had slipped to 114th.
On the men’s side, Americans John Isner and Sam Querrey reached the second round. Isner, seeded 13th, beat Filippo Volandri of Italy 6-0, 6-2, 6-3. The 26th-seeded Querrey defeated Guido Pella of Argentina 7-6 (3), 4-6, 6-1, 6-2.
Milos Raonic won his first Grand Slam match while seeded in the top 10. The Canadian defeated qualifier Thomas Fabbiano of Italy 6-3, 7-6 (6), 6-3.