Markis Kido
At the 2011 All England Open, Tan and Koo defeated 2008 Olympic champions Markis Kido and Hendra Setiawan in the quarterfinals. They then defeated World champions Cai Yun and Fu Haifeng 21–11, 23–21. They lost to Danes and world no.1 Mathias Boe and Carsten Mogensen 21–15, 18–21, 18–21. In doing so, they failed to win their second All England Open title.