Aug 31, 2016; New York, NY, USA; Milos Raonic of Canada hits a volley against Ryan Harrison of the United States (not pictured) on day three of the 2016 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center. Harrison won 6-7(4), 7-5, 7-5, 6-1. Mandatory Credit: Geoff Burke-USA TODAY Sports