China has failed to win a medal in men's badminton singles at the Asian Games for the first time since it began competing in the event in 1974, after defending champion Li Shifeng and world No 4 Shi Yuqi both lost early to South Korean opponents in Aichi-Nagoya, Japan. The result is a rare setback in an otherwise strong campaign, in which China won medals in every other badminton event, and it comes as the Chinese Badminton Association (the sport's national governing body) is being shaken up by corruption investigations into several senior officials.