Australian Open champion Naomi Osaka enjoyed her return to action for the first time since winning the Melbourne Slam, beating Australia's Ajla Tomljanovic 7-6(3) 6-4.
After receiving a first-round bye, Osaka twice recovered from a break down to beat the world number 77 in one hour and 38 minutes to continue her excellent run of form.
The 23-year-old has not lost in over a year, having also won the US Open for the second time in 2020.
Federer, Murray fall in major ranking shake-up; Norrie, Badosa into top 15
Osaka will next play Nina Stojanovic, who beat Yulia Putintseva 5-7 7-5 6-2, in the third round.

‘Serena intimidates me’ – Osaka’s AO win through her eyes

"This is my first match since Australia, so I just really wanted to play well," Osaka said post-match.
"I think for me, today I served really well when I needed to.
"Unfortunately I got broken a couple of times, but I think when it really, really mattered, I was able to serve well, so I’m happy with that."

Naomi Osaka Top 5: Best shots from the champion at the 2021 Australian Open

Australian Open: Will players need to be vaccinated? What are quarantine rules?
07/10/2021 AT 13:43
Osaka drops out of WTA top 10 rankings for the first time since 2018
04/10/2021 AT 13:42