Rafael Nadal of Spain hits a return shot against Jack Sock of the United States during their men’s singles quarterfinal match of the China Open tennis tournament at the National Tennis Stadium in Beijing, Friday, Oct. 9, 2015. (AP Photo/Andy Wong)
Rafael Nadal of Spain hits a return shot against Jack Sock of the United States during their men’s singles quarterfinal match of the China Open tennis tournament at the National Tennis Stadium in Beijing, Friday, Oct. 9, 2015. (AP Photo/Andy Wong)
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