hung has been the surprise packed of the tournament so far.
He is the lowest ranked player, at No 58 in the world, to reach the semi-final of the Australian Open since Marat Safin in 2004.
And his biggest achievement was undoubtedly beating Novak Djokovic in straight sets to reach the quarter-finals.
Marin Cilic awaits in the final, but the 21-year-old will first have to overcome his biggest challenge yet.
Federer is chasing his 20th Grand Slam title and is on course to reach a record seventh Australian Open final.
The 36-year-old is the clear favourite to progress to the final.
And former world No 1 Wilander believes Chung will only beat Federer if the latter has one of his worst service matches of his career.
“I think he has a chance if Federer has a horrific serving day, which he doesn’t have,” Wilander told Eurosport.
“That’s the strength of Roger Federer. A great server knows when they go below 50 per cent so they won’t allow it.
“It’s not about hitting great serves, it’s about winning your service games and I think that’s the difference.”
However, John McEnroe has seen enough of Chung to predict a bright future for the South Korean.
“The tennis is awesome, I think he’s going to win Slams,” McEnroe said.
“He’s an awesome talent. He’s come a long way because he had some injury issues a couple years back.”