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Japan's Kei Nishikori returns the ball to Brazil's Thomaz Belluci during the men's second round of the Roland Garros 2015 French Tennis Open in Paris on May 27, 2015. AFP PHOTO / DOMINIQUE FAGET (Photo credit should read DOMINIQUE FAGET/AFP/Getty Images)

Japan's Kei Nishikori returns the ball to Brazil's Thomaz Belluci during the men's second round of the Roland Garros 2015 French Tennis Open in Paris on May 27, 2015. AFP PHOTO / DOMINIQUE FAGET        (Photo credit should read DOMINIQUE FAGET/AFP/Getty Images)