Olympic badminton champion Zheng to retire from international events

File photo of Zheng Siwei. /CFP

China's Olympic mixed doubles badminton gold medalist Zheng Siwei announced that he will retire from international competition on Friday. Next month's BWF World Tour Finals in Hangzhou will be his "last dance".

"Many people expected me to play at least until the Los Angeles Olympics, or even longer. If there were any questions about our competitiveness, we just