PARIS, FRANCE - JUNE 03: Alexander Zverev of Germany hits a backhand to Karen Khachanov of Russia in the fourth round of the men's singles at Roland Garros during the French Open on June 3, 2018 in Paris, France. (Photo by Mike Frey/Getty Images)
PARIS, FRANCE - JUNE 03: Alexander Zverev of Germany hits a backhand to Karen Khachanov of Russia in the fourth round of the men's singles at Roland Garros during the French Open on June 3, 2018 in Paris, France. (Photo by Mike Frey/Getty Images)