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An employee cleans the court prior to a Monte-Carlo ATP Masters Series Tournament tennis match, on April 13, 2016 in Monaco. AFP PHOTO / JEAN CHRISTOPHE MAGNENET / AFP / Jean-Christophe MAGNENET (Photo credit should read JEAN-CHRISTOPHE MAGNENET/AFP/Getty Images)

An employee cleans the court prior to a Monte-Carlo ATP Masters Series Tournament tennis match, on April 13, 2016 in Monaco. AFP PHOTO / JEAN CHRISTOPHE MAGNENET / AFP / Jean-Christophe MAGNENET        (Photo credit should read JEAN-CHRISTOPHE MAGNENET/AFP/Getty Images)