Veterans Ma Long and Xu Xin will return to action at the stand-alone doubles tournament of the National Table Tennis Championships, which also features star mixed doubles duo Wang Chuqin and Sun Yingsha as well as long-time partnership Lin Shidong and Kuai Man. The week-long doubles competition kicked off on Monday in Changsha, Hunan, split into a three-day qualifying stage and a four-day main draw. It marks the first time in the championships’ 74-year history that the doubles events have been...