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ST PETERSBURG, RUSSIA - OCTOBER 15, 2020: Russian tennis player Aslan Karatsev competes in a Round of 16 match against his Russian rival Karen Khachanov during the St Petersburg Open 2020 international tournament held at Sibur Arena. Alexander Demianchuk/TASS (Photo by Alexander Demianchuk\TASS via Getty Images)

ST PETERSBURG, RUSSIA - OCTOBER 15, 2020: Russian tennis player Aslan Karatsev competes in a Round of 16 match against his Russian rival  Karen Khachanov during the St Petersburg Open 2020 international tournament held at Sibur Arena. Alexander Demianchuk/TASS (Photo by Alexander Demianchuk\TASS via Getty Images)