Update | 'My body is begging me to stop': Li Na confirms retirement because of recurring knee injuries
Two-time grand slam winner 'listens to her body' after latest surgery takes its toll

Li Na, the two-time grand slam champion from China who took tennis in Asia to a new level, has announced her retirement.
The 32-year-old Li posted the news on her microblog Friday, citing a recurring knee problem.
“Most people in the tennis world know that my career has been marked by my troubled right knee,” Li said in a statement.
Read the full text of Li Na's farewell letter
“After four knee surgeries and hundreds of shots injected into my knee weekly to alleviate swelling and pain, my body is begging me to stop the pounding.
“My previous three surgeries were on my right knee. My most recent knee surgery took place this July and was on my left knee. After a few weeks of post-surgery recovery, I tried to go through all the necessary steps to get back on the court."

Li set a host of milestones for tennis in China, including being the first Chinese player to win a WTA title and the first to win a major.