Stan Wawrinka of Switzerland returns the ball to Kevin Anderson of South Africa during their 2015 US Open Men's singles quarterfinals match at the USTA Billie Jean King National Tennis Center in New York on September 9, 2015. Wawrinka won 6-4, 6-4, 6-0. AFP PHOTO/JEWEL SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
