During the first several years of the 21st century Chen rated among the world's leading singles players, achieving a number one world ranking in 2002. He won the Swedish Open and the Asian Championships in 1999 as a nineteen-year-old. His subsequent titles included the Dutch (2000), Singapore (2002, 2003), Denmark (2002, 2006), Malaysia (2003), China (2005, 2006), and Thailand (2007) Opens. He twice captured the prestigious All-England Championships, 2002 and 2005, defeating his very formidable fellow countryman Lin Dan in the final on the second occasion. His performances at IBF World Championships and at the 2004 Olympic Games were not among his finest. He was a bronze medalist (semifinalist) at the 2001 and 2006 World Championships and was eliminated in the quarterfinals of the Games in Athens. Chen retired from serious competition in 2007.