China's Davis Cup tennis team player Wu Di celebrates winning the second set during his Davis Cup world group playoff singles match against Australia's Marinko Matosevic in Beijing July 8, 2011. [Photo/Agencies] 

A security guard walks above a group of Australian supporters watching Davis Cup tennis players Bernard Tomic of Australia and China's Zhang Ze play their world group playoff singles match in Beijing July 8, 2011. [Photo/Agencies]