Serena Williams of the United States smashes a backhand to Flavia Pennetta of Italy during their evening match at the U.S. Open tennis championship in New York, September 8, 2009. Serena Williams beats Flavia Pennetta of Italy 6-4, 6-3 during the quarterfinals of the U.S. Open tennis tournament in New York, Tuesday, Sept. 8, 2009.[Xinhua/Reuters]