Roddick upset in second round; player blames fall for collapse

NEW YORK — Andy Roddick was upset in the second round of the U.S. Open, 3-6, 7-5, 6-3, 7-6 (7-4) by 44th-ranked Janko Tipsarevic of Serbia on Wednesday night.

Roddick, seeded ninth, won his only Grand Slam title to date at Flushing Meadows in 2003. He was runnerup in 2006. His loss leaves Roger Federer as the only past men's champion in the field.

This early exit follows a fourth-round loss at Wimbledon. Roddick revealed recently that he had a mild case of mononucleosis.

Tipsarevic moves into the third round for the first time. He credited a big first serve percentage and, after losing the first set, finding momentum in the right game.

That matched ended a searingly hot day that had begun with 10th seed Victoria Azarenka collapsing 34 minutes into her match against Argentine Gisela Dulko. Azarenka eventually was helped into a wheelchair and taken to a hospital. Tests showed she had a mild concussion.

The temperature in Flushing Meadows headed into the 90s for a third consecutive day, and the mercury topped 100 degrees on the court. But Azarenka later said in a statement that wasn't her problem. She said she fell in the gym while warming up before the match, banging her head.

"She was just doing some footwork exercises, and she tripped on the bottom of her own sweat pants and ended up falling and hitting her head on the ground," her agent, John Tobias, said.

"I felt worse as the match went on, having a headache and feeling dizzy," said Azarenka, who is from Belarus but lives part of the year in Scottsdale, Ariz., with the family of former Lightning goalie Nikolai Khabibulin. When she retired, she trailed 5-1.

The day's other winners included 18-year-old American qualifier and Bradenton-based Ryan Harrison, a 6-3, 6-7 (4-7), 6-3, 6-4 victor over 15th seed Ivan Ljubicic, and unseeded Michael Llodra, who upset Wimbledon runnerup Tomas Berdych 7-6 (7-3), 6-4, 6-4 .

American Melanie Oudin, who last year at 17 reached the quarterfinals by beating two top-20 players, lost to No. 29 Alona Bondarenko 6-2, 7-5.

Hall of Fame: Andre Agassi leads the list of five 2011 nominees for the International Tennis Hall of Fame. He is the only nominee in the recent player category. Inductees will be announced early next year.