NEW YORK - Swiss superstar Roger Federer may have lost his top seeding but don't think for a minute he doesn't have a trump card up his sleeve at the US Open.
Federer, who surrendered his world number one ranking to Rafael Nadal on Monday, is the four-time defending champion in the final Grand Slam of the season which begins today.
"I know how to enter Grand Slams," second-seeded Federer said on Saturday.
"I know how to enter the US Open and what it takes to win.
"That's a huge advantage I have. I come here as the defending champion so I always have great feelings about this place," Federer said.
Federer, who turned 27 earlier this month, said he would draw on his enormous success here in the past to salvage something of what has been a disappointing season so far.
Nadal has never made it past the quarterfinals at the US Open and goes into today's major as the top seed for the first time in his career.
"I believe it is an advantage if you know how to win a US Open," Federer said. "It is a tough tournament to win. His disappointing year was underscored when he lost the number one ranking which he had held for a record 237 weeks. - Sapa-AFP