With the two set to meet again in a major final tomorrow, the 29-year-old has revealed that he believes it was important that something like that happened, so he could experience the low of losing after the high of winning the US Open.
Chung managed to win one more game but threw in the towel as the match ended on a low note for South Korea, but for Federer there is only highlights as he reaches his latest Grand final without dropping a set.
And Federer, who led 6-1 5-2, was the beneficiary, leaving just Croatian Marin Cilic in the way of what would be a 20th grand slam title. Federer lost just one service point in his victory and gave himself 11 break chances before Chung retired due to a blister injury.
"I'm really happy to be in the finals, but not like this". "It was the weirdest thing".
"So 45 minutes before a match, and he's biting into a towel having someone jabbing his feet".
Federer advances to Sunday's match against No. 6-seeded Marin Cilic, the 30th career appearance in a final for Federer. "I told him to practice in the tropicals helped me get to the finals!" I enjoyed two weeks so far, on court and off court. But he can bring the power.
Play is underway at Melbourne Park with the women's doubles final on Rod Laver Arena ahead of the men's singles semi-final.
Asked by on-court presenter Jim Courier whether he could have imagined such a turnaround, Federer was quick to respond. Though American tennis great John McEnroe expects Chung to win Grand Slams in the future, he's not giving the youngster a shot against Federer on Friday.
He says he is in a good space for Sunday's final with his serve and forehand working at an optimum in the year's opening Grand Slam.
The 21-year-old sent 12-time Grand Slam victor Novak Djokovic packing in the fourth round, although the Serb was carrying an injury and not at his best.
Federer praised Chung for trying to fight through the pain. He is leading 2-0 early in this set.
"In the second set, I could feel he was getting a bit slower, fighting with the blister". "I know he's had a problem with the blister for some time".
In his post-match interview, Roger Federer promised tennis fans that we will see "much more" of Hyeon Chung, and that he is going to be a "great, great player".
"I could tell something was up before the time out, he has great composure".