China's Andy Zhang tees off on the second hole during a practice round for the 2012 US Open golf tournament on the Lake Course at the Olympic Club in San Francisco, California June 13, 2012. [Photo/Agencies]
China's Andy Zhang signs autographs at the fourth tee during a practice round for the 2012 US Open golf tournament on the Lake Course at the Olympic Club in San Francisco, California June 13, 2012. [Photo/Agencies]