Djokovic survives thriller as Federer motors

By Pritha Sarkar

NEW YORK (Reuters) - Roger Federer leapt into the fourth round and Jelena Jankovic zoomed in on a maiden grand slam crown at the U.S. Open on Sunday when the title favorites discovered their sweet spots at Flushing Meadows.

After a week of lukewarm performances, four-times champion Federer turned on the heat with a masterful 6-3 6-3 6-2 destruction of Czech 28th seed Radek Stepanek.

Women's world number two Jankovic looked to be heading for another long workout but found her range to end the plucky challenge of Danish teenager Caroline Wozniacki in the fourth round with a 3-6 6-2 6-1 victory.

As temperatures soared on day seven of the hardcourt major, an ailing Marion Bartoli said it was a "miracle" she could battle on for more than three hours in the stifling conditions. She eventually fell 7-6 0-6 6-4 to Austrian Sybille Bammer.

"I had very low blood pressure and very weak pulse and the trainer advised me not to continue, especially because it was so hot," said the 12th seed, who had her pressure checked on court midway through the first set.

"I was sick since yesterday morning because I caught a stomach virus. Since then I had not eaten anything except one glass of orange juice."

While Bartoli wilted under sunny skies, Federer flourished.

In his first two matches, the Swiss master had fallen well short of proving his title credentials as he piled up 66 unforced errors and converted only 11 of 28 break points.

On Sunday, he dazzled Stepanek and 23,000 wide-eyed fans on Arthur Ashe Stadium court when his game clicked into overdrive.

SLAM DUNK

At one point, the Swiss even managed to surprise himself. With his back pinned to the rear wall, Federer leapt high into the air and his slam-dunk, mis-hit bounced off a startled Stepanek's racket frame for a winner.

After toying with Stepanek for 96 minutes, Federer threaded a forehand down the line to seal victory and celebrated by punching the air and holding aloft his index finger, as if to remind people "I'm still number one in New York."

"At the end of the day, what counts is winning the tournament. You forget all the unforced errors you made," said Federer, whose cloak of invincibility has been looking rather threadbare recently following his defeats in the French Open and Wimbledon finals by Rafael Nadal.

"If I were to win one of those slams right away, I have the invincibility factor again. I don't try to impress anybody in the early rounds," said the 27-year-old, who has also surrendered his number one status to Nadal.

Federer chalked up his 30th consecutive victory here to set up meeting with Russia's Igor Andreev.