China's Li ruled out of US Open

Washington: China`s world number two Li Na has been ruled out of next month`s US Open with a knee injury, she said on Thursday.

The 32-year-old Li, who won her second grand slam title at this year`s Australian Open, was knocked out in the first round of the French Open and in the third round at Wimbledon.
"Since March, I have been struggling with my knee and it is just not where I need it to be in order to play at the highest level," Li said on Facebook.

"My medical team has advised me that I need to take some time off to rest my knee so it heals," the 2011 French Open champion added.