Russia's Daria Kasatkina makes a backhand return to Aryna Sabalenka of Belarus during their second round match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Feb. 10, 2021.(AP Photo/Rick Rycroft)

Marie Bouzkova of the Czech Republic makes a backhand return to Ukraine's Elina Svitolina during their first round match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Feb. 9, 2021.(AP Photo/Rick Rycroft)