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Australia's Samuel Groth returns the ball to Spain's Rafael Nadal during their men's first round match at the Roland Garros 2016 French Tennis Open in Paris on May 24, 2016. / AFP / MIGUEL MEDINA (Photo credit should read MIGUEL MEDINA/AFP/Getty Images)

Australia's Samuel Groth returns the ball to Spain's Rafael Nadal during their men's first round match at the Roland Garros 2016 French Tennis Open in Paris on May 24, 2016. / AFP / MIGUEL MEDINA        (Photo credit should read MIGUEL MEDINA/AFP/Getty Images)