Hong Kong made a low-key but successful start to the 13th World Championships with only the men's doubles pairs in action on the opening day.Yohan Hadikusum Wiratama and Yau Tsz-yuk were comfortable winners, defeating Russian brothers Alexandr and Nikolaj Nikolaenko 15-8, 15-11. In tomorrow's second round they face the eighth seeds Mathias Boe and Michael Lamp of Denmark. The majority of the SAR's players will have their first matches later today. In the men's singles, Agus Hariyanto, the seventh seed, faces Canadian Bobby Milroy while Ng Wei, the 14th seed, plays Japan's Shinya Ohtsuka. In the women's singles, Ling Wan-ting faces Aparna Popat of India, while Louisa Koon Wai-chi faces Grace Daniel of Nigeria. Hong Kong's world number one, Wang Chen, begins her championship tomorrow with her mixed doubles partner Albertus Susanto Njoto against the American pair Mike Chansawangpuvana and Eva Lee.