Egor Gerasimov of Belarus plays during Davis Cup Europe/Africa group I playoff tennis match against Daniil Medvedev of Russia, in Moscow, Russia, September 15, 2018.

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Egor Gerasimov of Belarus plays during Davis Cup Europe/Africa group I playoff tennis match against Daniil Medvedev of Russia, in Moscow, Russia, September 15, 2018.

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Egor Gerasimov of Belarus plays during Davis Cup Europe/Africa group I playoff tennis match against Daniil Medvedev of Russia, in Moscow, Russia, September 15, 2018.

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From left: Karen Khachanov, Daniil Medvedev and Andrey Rublev celebrate team's victory during Davis Cup Europe/Africa group I playoff tennis match between Russia and Belarus, in Moscow, Russia, September 15, 2018. Andrey Rublev, left, and Karen Khachanov

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From left: Karen Khachanov, Daniil Medvedev and Andrey Rublev celebrate team's victory during Davis Cup Europe/Africa group I playoff tennis match between Russia and Belarus, in Moscow, Russia, September 15, 2018. Andrey Rublev, left, and Karen Khachanov

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Daniil Medvedev, left, of Russia shakes hands with captain of the Russian team Shamil Tarpischev as they celebrate team's victory during Davis Cup Europe/Africa group I playoff tennis match between Russia and Belarus, in Moscow, Russia, September 15, 2018.

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Daniil Medvedev of Russia reacts during Davis Cup Europe/Africa group I playoff tennis match against Egor Gerasimov of Belarus, in Moscow, Russia, September 15, 2018.

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Daniil Medvedev of Russia reacts during Davis Cup Europe/Africa group I playoff tennis match against Egor Gerasimov of Belarus, in Moscow, Russia, September 15, 2018.

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Daniil Medvedev of Russia reacts during Davis Cup Europe/Africa group I playoff tennis match against Egor Gerasimov of Belarus, in Moscow, Russia, September 15, 2018.

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Daniil Medvedev of Russia plays during Davis Cup Europe/Africa group I playoff tennis match against Egor Gerasimov of Belarus, in Moscow, Russia, September 15, 2018.

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Daniil Medvedev of Russia reacts during Davis Cup Europe/Africa group I playoff tennis match against Egor Gerasimov of Belarus, in Moscow, Russia, September 15, 2018.

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Daniil Medvedev of Russia plays during Davis Cup Europe/Africa group I playoff tennis match against Egor Gerasimov of Belarus, in Moscow, Russia, September 15, 2018.

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Daniil Medvedev of Russia plays during Davis Cup Europe/Africa group I playoff tennis match against Egor Gerasimov of Belarus, in Moscow, Russia, September 15, 2018.

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Daniil Medvedev of Russia plays during Davis Cup Europe/Africa group I playoff tennis match against Egor Gerasimov of Belarus, in Moscow, Russia, September 15, 2018.

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Captain of the Russian team Shamil Tarpischev salutes during Davis Cup Europe/Africa group I playoff tennis match between Russia and Belarus, in Moscow, Russia, September 15, 2018.

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Ilya Ivashka of Belarus plays during Davis Cup Europe/Africa group I playoff tennis match against Karen Khachanov of Russia, in Moscow, Russia, September 15, 2018.

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Ilya Ivashka of Belarus serves during Davis Cup Europe/Africa group I playoff tennis match against Karen Khachanov of Russia, in Moscow, Russia, September 15, 2018.

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Captain of the Russian team Shamil Tarpischev, right, talks to Andrey Rublev, left, and Karen Khachanov during Davis Cup Europe/Africa group I playoff doubles tennis match against Maxim Mirnyi and Andrei Vasilevski of Belarus, in Moscow, Russia, September 15, 2018.

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Karen Khachanov of Russia reacts during Davis Cup Europe/Africa group I playoff tennis match against Ilya Ivashka of Belarus, in Moscow, Russia, September 15, 2018.

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Karen Khachanov of Russia plays during Davis Cup Europe/Africa group I playoff tennis match against Ilya Ivashka of Belarus, in Moscow, Russia, September 15, 2018.

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Karen Khachanov of Russia serves during Davis Cup Europe/Africa group I playoff tennis match against Ilya Ivashka of Belarus, in Moscow, Russia, September 15, 2018.

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Karen Khachanov of Russia reacts during Davis Cup Europe/Africa group I playoff tennis match against Ilya Ivashka of Belarus, in Moscow, Russia, September 15, 2018.

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Maxim Mirnyi of Belarus in action during Davis Cup Europe/Africa group I playoff doubles tennis match against Karen Khachanov and Andrey Rublev of Russia, in Moscow, Russia, September 15, 2018.

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Karen Khachanov, left, and Andrey Rublev of Russia react during Davis Cup Europe/Africa group I playoff doubles tennis match against Maxim Mirnyi and Andrei Vasilevski of Belarus, in Moscow, Russia, September 15, 2018.

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Karen Khachanov, right, and Andrey Rublev of Russia react during Davis Cup Europe/Africa group I playoff doubles tennis match against Maxim Mirnyi and Andrei Vasilevski of Belarus, in Moscow, Russia, September 15, 2018.

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Karen Khachanov and Andrey Rublev, left, of Russia in action during Davis Cup Europe/Africa group I playoff doubles tennis match against Maxim Mirnyi and Andrei Vasilevski of Belarus, in Moscow, Russia, September 15, 2018.

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Karen Khachanov of Russia in action during Davis Cup Europe/Africa group I playoff doubles tennis match against Maxim Mirnyi and Andrei Vasilevski of Belarus, in Moscow, Russia, September 15, 2018.

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Karen Khachanov of Russia in action during Davis Cup Europe/Africa group I playoff doubles tennis match against Maxim Mirnyi and Andrei Vasilevski of Belarus, in Moscow, Russia, September 15, 2018.

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Maxim Mirnyi, left, and Andrei Vasilevski of Belarus react during Davis Cup Europe/Africa group I playoff doubles tennis match against Karen Khachanov and Andrey Rublev of Russia, in Moscow, Russia, September 15, 2018.

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