First match of the day at Rod Laver Arena, Osaka went against Latvia's Anastasija Sevastova on Day 8 of the Australian Open. The Japanese fourth seed won 4-6, 6-3,6-4.
On that evening, Kei Nishikori's fouth round was against Spaniard Pablo Carreno Busta, World's No.23. He came 2 sets down and won the super tiebreak, 6-7(8), 4-6, 7-4(4), 6-4, 7-6(8). Total play time recorded 5 hours and 5 minutes, another epic match for Nishikori.
