BEIJING - OCTOBER 08:  Serena Williams of USA returns a shot against Nadia Petrova of Russia in her third round match during day seven of the 2009 China Open at the National Tennis Centre on October 8, 2009 in Beijing, China. Getty Images logo Getty Images 28 months ago

BEIJING - OCTOBER 08: Serena Williams of USA returns a shot against Nadia Petrova of Russia in her third round match during day seven of the 2009 China Open at the National Tennis Centre on October 8, 2009 in Beijing, China.