The 21-year-old, who ousted six-time champion Novak Djokovic in the fourth round, continued his blazing run with a 6-4 7-6(5) 6-3 win over American Tennys Sandgren.
“I’m very excited to play Chung, I thought he played an incredible match against Novak (Djokovic),” Federer said in his on-court interview.
“Right now I couldn’t tell you how I need to play him. One thing I know is I’m going to be playing aggressive.”
Chung Hyeon became the first South Korean to reach the semi-finals of a grand slam when he beat American Tennys Sandgren 6-4 7-6(5) 6-3 in two hours and 28 minutes on Rod Laver Arena.
Angelique Kerber stormed into the semi-finals with a win 6-1 6-2 victory over Madison Keys.
India’s Rohan Bopanna and his Hungarian partner Timea Babos advanced to the semifinals of the mixed doubles at the Australian Open on Wednesday.
Bopanna and Babos beat USA’s Abigail Spears and Colombia’s Juan Sebastian Cabal 6-4, 7-6 (5) in one hour, 15 minutes.