NEW YORK, NY - SEPTEMBER 05:  Shuai Peng of China is tended to by trainers after getting injured while playing against Caroline Wozniacki of Denmark during their women's singles semifinal match on Day Twelve of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 5, 2014 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Streeter Lecka/Getty Images)