Combining Cai Yun's impressive speed with his regular partner Fu Haifeng's impressive power, Cai and Fu have been one of the world's leading men's doubles teams since 2004. They have won numerous top tier events on the world circuit including the venerable All England Open Championships in 2005 and 2009. They have won the BWF World Championships 4 times in 2006, 2009, 2010 and 2011, becoming the first Men's Doubles pair to achieve this feat. Cai and Fu have helped China win five consecutive Thomas Cup (Men's Team World Badminton Championships) (2004, 2006, 2008, 2010, and 2012) and six consecutive Sudirman Cup (World Team Championships) (2005, 2007, 2009, 2011, 2013 and 2015). Cai and Fu also competed together in the Olympic games 3 times, including the 2004, the 2008 Olympic Games and the 2012 Olympic Games. They were eliminated in the quarterfinals in 2004, and in 2008 in Beijing were silver medalists, losing a close final to Indonesia's Markis Kido and Hendra Setiawan.