Romania's Simona Halep celebrates a point win over Poland's Iga Swiatek during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Feb. 14, 2021.(AP Photo/Hamish Blair)

Romania's Simona Halep hits a forehand return to United States' Serena Williams during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Feb. 16, 2021.(AP Photo/Andy Brownbill)