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Rafael Nadal of Spain hits a return to Borna Coric of Croatia, in Mason, Ohio, on August 18, 2016

Rafael Nadal of Spain hits a return to Borna Coric of Croatia, in Mason, Ohio, on August 18, 2016 (AFP Photo/Joe Robbins)

Tennis star Rafael Nadal

Rafael Nadal pulled out of the London Olympics on Thursday due to injury.