NEW YORK, NY - SEPTEMBER 5 :  Serena Williams of the United States serves against Ekaterina Makarova of Russia during women's singles semifinal match on Day 12 of the 2014 US Open at the USTA Billie Jean King National Center in New York, United States on September 5, 2014. (Photo by Bilgin Sasmaz/Anadolu Agency/Getty Images)