Halep sent home but Djokovic, Williams headed to the Australian Open quarter-finals

Novak Djokovic of Serbia reacts during the men's singles fourth round match between Novak Djokovic of Serbia and Daniil Medvedev of Russia at 2019 Australian Open in Melbourne, Australia, on Jan. 21, 2019. Novak Djokovic won 3-1. (Xinhua/Bai Xue)