Novak Djokovic and Dominic Thiem are both through to the last 16, but the Austrian looked to be in better shape after his triumph.
Dominic Thiem overcame Nick Kyrgios in a thrilling contest at the Australian Open.
Nick Kyrgios will face Dominic Thiem in a blockbuster third-round clash at the Australian Open.
It was a good day for the vast majority of the big names in action in the men's draw at the Australian Open, as well as Nick Kyrgios.
Novak Djokovic said he had "no respect" for Nick Kyrgios and refused to reply to the Australian's response after winning at Melbourne Park.
The Australian Open draw took place on Friday, with world number one Novak Djokovic set to play Jeremy Chardy in the opening round.
While Rafael Nadal was not able to play on day one, Novak Djokovic enjoyed a successful start to the ATP Cup.
Tennis has been played without crowds for almost a year, so Serena Williams, Naomi Osaka and Rafael Nadal enjoyed seeing fans in Adelaide.
Vladimir Putin paid tribute to the "mastery" of Daniil Medvedev after his victory at the ATP Finals.
After becoming the ATP Finals champion, Daniil Medvedev said he wants plenty more battles with beaten opponent Dominic Thiem.