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TOPSHOT - Spain's Rafael Nadal returns the ball to Germany's Maximilian Marterer during their men's singles fourth round match on day nine of The Roland Garros 2018 French Open tennis tournament in Paris on June 4, 2018. (Photo by Eric FEFERBERG / AFP) (Photo credit should read ERIC FEFERBERG/AFP/Getty Images)

TOPSHOT - Spain's Rafael Nadal returns the ball to Germany's Maximilian Marterer during their men's singles fourth round match on day nine of The Roland Garros 2018 French Open tennis tournament in Paris on June 4, 2018. (Photo by Eric FEFERBERG / AFP)        (Photo credit should read ERIC FEFERBERG/AFP/Getty Images)