NEW YORK, NY - AUGUST 30:  Serena Williams of the United States reacts against Varvara Lepchenko of the United States during their women's singles third round match on Day Six of the 2014 US Open at the USTA Billie Jean King National Tennis Center on August 30, 2014 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Chris Trotman/Getty Images for USTA)