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FILE - In this Oct. 7, 2016 file photo, Madison Keys of the United States serves against Petra Kvitova of the Czech Republic during the women's singles quarterfinals of the China Open tennis tournament in Beijing.  Keys is the first American outside of Serena and Venus Williams to earn a berth at the year-end WTA Finals in more than a decade. (AP Photo/Andy Wong)
Associated Press | October 22, 2016 9:44 am
Keys 1st American in WTA Finals since Williams sisters