What was the nationality of the defending champion at the Men's Singles tournament of the 2013 BWF World Championships?
2013 BWF World Championships – Men's singles The Men's Singles tournament of the 2013 BWF World Championships was held from August 5–11. Lin Dan was the defending champion.
Wong Wai Hong Wong Wai Hong (; born 31 March 1986) is a badminton player from Hong Kong. In 2010, he became the runner-up at the Polish International tournament in the men's doubles event partnered with Yohan Hadikusumo Wiratama. In 2011, he won the Austrian International tournament in the mixed doubles event partnered with Chau Hoi Wah. In 2012, Wong and his partner repeat their success in Austria. Partnering with Chan Yun Lung in the men's doubles, he became the runner-up at the 2013 Ciputra Hanoi Vietnam Challenge tournament.