Federer overcame Tomas Berdych to reach the last four of the first Grand Slam of 2018.

And he faces 21-year-old South Korean Chung, who has impressed, beating Novak Djokovic on his way to the last four.

This is already the deepest he’s gone in a Grand Slam but he will hope to overcome the Grand Slam king to face Marin Cilic in Sunday’s final.

What time does Roger Federer play Chung Hyeon in the Australian Open Grand Slam semi-final?

Timings for tennis events are always vague and dependent on previous matches.

However the Federer match follows the Australia Day ceremony and is scheduled in for not before 7.30pm local time and 8.30am UK time.

So if you’re in the UK it is likely to get underway some time between 8.30am and 9am with the ceremony scheduled for 8.10.

Federer is hoping to win a 20th Grand Slam title and defend the one he won in Australia last year.

And former champion Mats Wilander thinks he should have too much for Chung tomorrow.

"Chung only has a very small chance," Wilander, working as a commentator for Eurosport in Melbourne, told Reuters.

"He doesn't serve well enough. There will be so much pressure on his serve and Federer will have the freedom to try a few different things on the Chung serve.

"He won't get enough free points. Once the ball is in play he has a chance but I think he is a bit too simple as a player at the moment against someone as experienced as Federer.

"It's just not the right player for him to play against. Federer has so many different weapons and ways he can play.

"But it will be interesting to see what he comes up with."

Who does the winner play in the final?

The winner of the Federer vs Chung match will face Cilic in the final on Sunday morning after he beat Britain’s Kyle Edmund on Thursday morning.