Pete Sampras and Martina Hingis, both ranked No. 1 in the world and seeded No. 1 in the U.S. Open, know their opponents, especially in the early rounds, can be dangerous.

"I remember when I played Mats Wilander here in '88 or '89, I had nothing to lose," Sampras said. "He was the defending champion, he was still ranked pretty high at the time. Then once you kind of get into the match, he had all the pressure."Sampras has something to lose now - his U.S. Open crown.

Sampras, however, defeated Baur 7-5, 6-4, 6-3 on Thursday night to advance into the third round of the year's final Grand Slam tournament.

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Hingis, meanwhile, had little problem knocking off Denisa Chladkova of the Czech Republic 6-1, 6-2.

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