Hingis won six straight games and took just over an hour to beat the 16-year-old Wozniacki, this year's Wimbledon junior champion.

``It was stressful to get here from India,'' said Hingis, who won the Sunfeast Open on Sunday. ``I was able to step up my game even though I was tired.''

In second-round matches, fifth-seeded Vera Zvonareva downed Emma Laine 6-4, 6-0; Akiko Morigami defeated Aiko Nakamura 7-5, 6-2; and Eleni Daniilidou rallied to beat Vera Dushevina 1-6, 6-1, 6-0.

Sania Mirza won the other first-round match, overcoming a poor first set to rout Lee Ye-ra 3-6, 6-0, 6-0.

Hingis, who is looking for her third WTA title since returning from a three-year retirement, said the competition was stiffer this time round.

``The players are better, more relentless,'' she said. ``I felt like there was more left in me, that's why I came back. I've been pretty successful so far.''