Sep 5, 2016; New York, NY, USA; Venus Williams of the United States serves against Karolina Pliskova of the Czech Republic (not pictured) on day eight of the 2016 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center. Pliskova won 4-6, 6-4, 7-6(3). Mandatory Credit: Geoff Burke-USA TODAY Sports