Victoria Azarenka out of doubles

Updated: September 2, 2010, 6:14 PM ET
Associated Press

NEW YORK -- A day after Victoria Azarenka collapsed on court during a singles match at the U.S. Open, she and partner Dinara Safina pulled out of women's doubles.

Azarenka and Safina were originally scheduled to face the ninth-seeded pair of Cara Black and Anastasia Rodionova in the first round of doubles Thursday. But the tournament said Black and Rodionova instead would play Alberta Brianti and Urszula Radwanska.

On Wednesday, Azarenka, a 21-year-old seeded 10th in singles, stopped playing in the first set of her second-round match when she staggered and fell down. She was taken away in a wheelchair and then went to a hospital for tests, which showed she had a mild concussion.

Azarenka said she banged her head in a fall at the gym before the match.

Copyright 2010 by The Associated Press