China's Wang Xin, with bandages around her left knee, grimaces after sustaining an injury during her women's singles badminton bronze medal match against India's Saina Nehwal at the London 2012 Olympic Games at the Wembley Arena August 4, 2012. REUTERS/Toru Hanai (BRITAIN - Tags: SPORT BADMINTON SPORT OLYMPICS TPX IMAGES OF THE DAY)