JINAN, East China, Oct. 21 (Xinhua) -- Chinese tennis star Li Na was forced to quit the on-going 11th National Games due to injury on Wednesday.

    After losing the first set 0-6 to Chen Yanchong of Guangdong in the second round of the women's singles, Li Na, from Hubei, retired from the match because of right knee injury.

    It was Li Na's first match in Jinan.