Li Na suffers early exit at French Open

Li Na of China hits a return to Bethanie Mattek-Sands of the US during their women's singles match at the French Open tennis tournament at the Roland Garros stadium in Paris, May 30, 2013. [Photo/Agencies]

Li Na of China serves to Bethanie Mattek-Sands of the US during their women's singles match at the French Open tennis tournament at the Roland Garros stadium in Paris, May 30, 2013. [Photo/Agencies]