The South Korean underdog defied all the odds to reach the last four before he was forced to retire against Federer.
After winning the first set, the Swiss star was on course for similar success in the second when Chung had to withdraw because of a badly blistered foot.
Most young tennis stars would do anything to play a competitive match against Federer, never mind taking him on in a semi-final of a major competition.
But Chung, 21, says his favorite moment of the competition was when he beat former world number one Novak Djokovic in straight sets in the round of 16.
“It was a Grand Slam, so every match counted,” he said.
“But the match against Djokovic was the most memorable one because he and I met again at the same court two years after we played each other before.”
Two years previous Djokovic put Chung to bed early with a straight sets win, but little did he know then how the youngster would rise.
After the famous win, the world number 29 wrote on a camera lens “Did you see it?” aimed at former coach Kim Il-soon, who was in charge of the Samsung Tennis Team which was disbanded in 2015.
Chung picked up the nickname ‘professor’ while in Australia and he was quizzed on the meaning.
“I guess I got the nickname because I was young but calm when playing tennis,” he said.