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

Kei Nishikori of Japan celebrates after the men's singles fourth round match between Kei Nishikori of Japan and Pablo Carreno Busta of Spain at 2019 Australian Open in Melbourne, Australia, on Jan. 21, 2019. Kei Nishikori won 3-2. (Xinhua/Bai Xue)