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Juan Martin del Potro of Argentina hits a return against Richard Gasquet of France during their men's singles second round match at the Shanghai Masters tennis tournament on October 10, 2018. (Photo by Johannes EISELE / AFP) (Photo credit should read JOHANNES EISELE/AFP/Getty Images)

Juan Martin del Potro of Argentina hits a return against Richard Gasquet of France during their men's singles second round match at the Shanghai Masters tennis tournament on October 10, 2018. (Photo by Johannes EISELE / AFP)        (Photo credit should read JOHANNES EISELE/AFP/Getty Images)