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MELBOURNE, AUSTRALIA - JANUARY 17: Denis Kudla of the United States plays a backhand in his first round singles match against Karen Khachanov of Russia during day one of the 2022 Australian Open at Melbourne Park on January 17, 2022 in Melbourne, Australia. (Photo by Kelly Defina/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 17: Denis Kudla of the United States plays a backhand in his first round singles match against Karen Khachanov of Russia during day one of the 2022 Australian Open at Melbourne Park on January 17, 2022 in Melbourne, Australia. (Photo by Kelly Defina/Getty Images)