Sep 5, 2016; New York, NY, USA; Karolina Pliskova of the Czech Republic serves against Venus Williams of the United States (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