NEW YORK, NY – SEPTEMBER 07: Stanislas Wawrinka of Switzerland reacts during his men’s singles semifinal match against Novak Djokovic of Serbia on Day Thirteen of the 2013 US Open at USTA Billie Jean King National Tennis Center on September 7, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)
2013 US Open – Day 13
