FLUSHING, NY - AUGUST 29:  Serena Williams (R) hits a ball while Andy Roddick, Roger Federer of Switzerland, Will Ferrell and Maria Sharapova of Russia look on during Arthur Ashe Kid's Day at the 2009 U.S. Open at the Billie Jean King National Tennis Center on August 29, 2009 in the Flushing neighborhood of the Queens borough of New York City. Getty Images logo Getty Images 3 months ago

FLUSHING, NY - AUGUST 29: Serena Williams (R) hits a ball while Andy Roddick, Roger Federer of Switzerland, Will Ferrell and Maria Sharapova of Russia look on during Arthur Ashe Kid's Day at the 2009 U.S. Open at the Billie Jean King National Tennis Center on August 29, 2009 in the Flushing neighborhood of the Queens borough of New York City.