Serena Williams (USA) serves to Flavia Pennetta (ITA) on day ten of the 2014 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center. Mandatory Credit: Jerry Lai-USA TODAY Sports
Serena Williams (USA) serves to Flavia Pennetta (ITA) on day ten of the 2014 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center. Mandatory Credit: Jerry Lai-USA TODAY Sports