Italy's Matteo Berrettini reacts during his match against Russia's Daniil Medvedev in the ATP Cup final in Melbourne, Australia, Sunday, Feb. 7, 2021.(AP Photo/Hamish Blair)

Russia's Andrey Rublev, right, is congratulated by Italy's Fabio Fognini after winning their match in the ATP Cup final in Melbourne, Australia, Sunday, Feb. 7, 2021.(AP Photo/Hamish Blair)

Russia's Daniil Medvedev kisses the trophy after defeating Italy in the final of the ATP Cup in Melbourne, Australia, Sunday, Feb. 7, 2021.(AP Photo/Hamish Blair)

Russia's ATP Cup winners Daniil Medvedev, Andrey Rublev, Aslan Karatsev and Evgeny Donsky pose with their trophy after defeating Italy in the final in Melbourne, Australia, Sunday, Feb. 7, 2021.(AP Photo/Hamish Blair)

Russia's Daniil Medvedev celebrates after defeating Italy's Matteo Berrettini in the ATP Cup final in Melbourne, Australia, Sunday, Feb. 7, 2021.(AP Photo/Hamish Blair)

Russia's Andrey Rublev celebrates after defeating Italy's Fabio Fognini in the ATP Cup final in Melbourne, Australia, Sunday, Feb. 7, 2021.(AP Photo/Hamish Blair)

Italy's Fabio Fognini reacts during his match against Russia's Andrey Rublev in the ATP Cup final in Melbourne, Australia, Sunday, Feb. 7, 2021.(AP Photo/Hamish Blair)