Zhang Chao (L) and Cao Zhen of China celebrate after winning the final of mixed doubles against their compatriots Hao Shuai and Mu Zi in World Table Tennis Championships (WTTC) at Ahoy Arena in Rotterdam, the Netherlands, May 13, 2011. Zhang Chao and Cao Zhen won 4-1 to claim the champion of the event. [Xinhua/Wang Lili]