鄭在成
At the 2010 BWF World Championships, Tan and partner Koo Kien Keat launched themselves into the semifinals after beating Korean rivals Lee Yong-dae and Jung Jae-sung. In the semifinals they defeated China's Guo Zhendong and Xu Chen 21–14, 21–18. Tan Boon Heong and Koo Kien Keat were the first Malaysian pair to enter a World Championships final in 13 years. In the finals, they played China's Cai Yun and Fu Haifeng and lost 21–18, 18–21, 14–21. The year 2010 was the last time Koo and Tan ranked World No. 1.