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MOSCOW, RUSSIA - OCTOBER 24: Marin Cilic of Croatia plays their men's final match against Aslan Karatsev of Russia during on Day Seven of the VTB Kremlin Cup at Central court of the Irina Viner-Usmanova Gymnastics Palace and the Palace of Sports on October 24, 2021 in Moscow, Russia. (Photo by Oleg Nikishin/Getty Images)

MOSCOW, RUSSIA - OCTOBER 24: Marin Cilic of Croatia plays their men's final match against Aslan Karatsev of Russia during on Day Seven of the VTB Kremlin Cup at Central court of the Irina Viner-Usmanova Gymnastics Palace and the Palace of Sports on October 24, 2021 in Moscow, Russia. (Photo by Oleg Nikishin/Getty Images)