Belgium's Elise Mertens leaps as she holds her trophy after defeating Estonia's Kaia Kanepi in the final of the Gippsland Trophy in Melbourne, Australia, Sunday, Feb. 7, 2021.(AP Photo/Andy Brownbill)

Australia's Ash Barty celebrates after defeating Spain's Garbine Muguruza in the final of the Yarra River Classic in Melbourne, Australia, Sunday, Feb. 7, 2021.(AP Photo/Andy Brownbill)

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

Spain's Garbine Muguruza makes a forehand return to Australia's Ash Barty in the final of the Yarra River Classic in Melbourne, Australia, Sunday, Feb. 7, 2021.(AP Photo/Andy Brownbill)

Australia's Ash Party holds her trophy after defeating Spain's Garbine Muguruza in the final of the Yarra Valley Classic in Melbourne, Australia, Sunday, Feb. 7, 2021.(AP Photo/Andy Brownbill)

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)

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)

Belgium's Elise Mertens celebrates after defeating Estonia's Kaia Kanepi in the final of the Gippsland Trophy in Melbourne, Australia, Sunday, Feb. 7, 2021.(AP Photo/Andy Brownbill)

Russia's ATP Cup winners Daniil Medvedev,right, Andrey Rublev second left, Aslan Karatsev and Evgeny Donsky, left, wave to the crowd after defeating Italy in the final in Melbourne, Australia, Sunday, Feb. 7, 2021.(AP Photo/Hamish Blair)