鄭在成
In 2009, the two won the bronze medal at the 2009 World Championships. At the 2010 BWF World Championships, the pair entered the semifinals after beating Korean rivals Jung Jae-sung and Lee Yong-dae. In the semifinals they defeated China's Guo Zhendong and Xu Chen 21-14, 21-18. Tan and Koo became the first Malaysian pair to enter a World Championship final in 13 years. In the finals, they played China's Cai Yun and Fu Haifeng but lost 21-18, 18-21, 14-21.