Defending champion Roger Federer and 6-time winner Novak Djokovic have booked their spots in the fourth round after straight-set wins over their respective opponents at the ongoing Australian Open.

Five-time champion Federer saw off Richard Gasquet 6-2 7-5 6-4 to progress to the last 16 while former world number one Djokovic had treatment on his lower back and leg but still manage to beat Albert Ramos-Vinolas 6-2 6-3 6-3 in two hours and 23 minutes.

Serbian tennis star Djokovic, 30, is playing his first tournament since last year’s Wimbledon Open after a six-month layoff with an elbow injury.

Djokovic will now face Hyeon Chung, who is the first South Korean to make an appearance in the last 16 of a Grand Slam as his reward for stunning fourth seed Alexander Zverev 5-7 7-6 (7-3) 6-3 6-0 in their third round clash.

Speaking after his injury scare, Djokovic said: “It’s nothing major to be concerned about. It’s things that surface every day. I guess it’s normal.”

“These kind of circumstances in which I’m in at the moment are quite different.

“I’ve never faced a situation where I didn’t compete six months.

“That’s why I’m kind of forced to be very cautious of what happens day-to-day, be dedicated to my body and training.” he added.

On his own part, five-time champion Federer said: “I was able to maybe stay a little more on the offensive than he was.”

“The second set was tight, the match was close and the end could have gone to a tie-break.” the Swiss concluded.

He will face Hungarian world number 80 Marton Fucsovics in the last 16.