|Victoria Azarenka of Belarus announces her withdrawal during a press conference at the Rogers Cup at the Uniprix Stadium on August 10, 2012 in Montreal, Quebec, Canada. (Robert Laberge/Getty Images/AFP)
MONTREAL - Another day, another ailing star who's out of the Rogers Cup.
World No. 1 and top seed Victoria Azarenka of Belarus said Friday that she won't complete her rain-delayed match against Tamira Paszek of Austria because of a left knee injury.
The 23-year-old reached the Olympic semifinals last week and said she started feeling soreness in the knee during practice in Montreal.
"The (past) week took so much out of me and my body didn't have the time to recover," said Azarenka, who plans to skip a tournament in Cincinnati next week as well.
"I just felt my knee was not in good shape. I tried (Thursday), and (Friday) it just got worse and I don't see the point of not giving my best."
She said she plans to rest "for a long period to time" to get ready for the U.S. Open at the end of the month.
Azarenka's withdrawal means that the unseeded Paszek will advance to the third round to play Carla Suarez Navarro of Spain.
Azarenka, this year's Australian Open champion and a three-time Rogers Cup semifinalist, is the second top player to withdraw from the Montreal event.
Russian tennis star Maria Sharapova pulled out of the Rogers Cup on Wednesday, citing a "very bad" stomach virus.
Olympic gold medallist Serena Williams earlier had announced that she wouldn't be making the trip to Montreal.