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SAN DIEGO, CA - SEPTEMBER 30: Denis Shapovalov of Canada prepares a backhand slice during his match against Taylor Fritz of the United States at the ATP 250 San Diego Open round of 16 at Barnes Tennis Center on September 30, 2021 in San Diego, California. Shapovalov won the match (7-6, 6-2). (Photo by Gary Payne/Getty Images)

SAN DIEGO, CA - SEPTEMBER 30: Denis Shapovalov of Canada prepares a backhand slice during his match against Taylor Fritz of the United States at the ATP 250 San Diego Open round of 16 at Barnes Tennis Center on September 30, 2021 in San Diego, California. Shapovalov won the match (7-6, 6-2). (Photo by Gary Payne/Getty Images)