World number one tennis player Spain's Rafael Nadal defeated Japan's Yoshihito Nishioka 7-6, 6-4 in the ATP Cup in Perth to advance his team to the quarterfinals. In Brisbane, world number two Serbian player Novak Djokovic easily defeated Chilean Christian Garin 6-3, 6-3, which led Serbia to the final-eight with a 2–1 victory. Serbia has won all three of their matches played in Group A. At the same time, in Group B, Spain led by Nadal defeated Japan 3–0 in a one-sided match. In the singles match, Nadal had to resort to a tiebreaker to win the first game, but he took Spain to the knockout by winning the second game. Spain's Roberto Batista Agut defeated Go Soida of Japan 6-2, 6-4 before winning in doubles.

On the other hand, Poland defeated Austria 2–1 in Group-E in Sydney. In this match, world number four Austrian player Dominic Thiem was defeated by Hubert Hurkacz of Poland 3-6, 6-4, 7-6. This is Thiem's ​​second defeat in this year.