Novak Djokovic crashed out of the Australian Open as an elbow injury that had sidelined him for the last six months resurfaced in Melbourne.
Djokovic battled back from a 4-0 deficit in the first set of his fourth round clash against the unseeded Chung Hyeon only to lose the tiebreak, at the end of which he had treatment on his right elbow.
The issue, which had kept him out of competitive action since Wimbledon last year, seemed to continue troubling him intermittently but he battled bravely before succumbing to a 7-6 (7/4) 7-5 7-6 (7/3) defeat.
Chung next faces a quarter-final clash against Tennys Sandgren, who claimed his own upset win when he ousted fifth seed Dominic Thiem in five sets.
INCREDIBLE! 🌟
— #AusOpen (@AustralianOpen) January 22, 2018
Hyeon #Chung becomes the first Korean player in history - man or woman - to reach the QF at a Grand Slam.#AusOpen pic.twitter.com/R67I9fLEmn
Meanwhile, Roger Federer maintained his record of not having dropped a set with a straightforward victory over Marton Fucsovics to reach the quarter-finals.
The 25-year-old Hungarian was a surprise face in the fourth round and acquitted himself well on Rod Laver Arena but ultimately proved no match for the defending champion, who won 6-4 7-6 (7/3) 6-2.
The victory sends Federer through to the last eight in Melbourne for the 14th time and 52nd overall in grand slams, where he is likely to be more severely tested by Tomas Berdych.
This was a first meeting for the pair, although Federer played Fucsovics' coach Attila Savolt in the second round in Melbourne 16 years ago.
Federer was also playing during the day for the first time all tournament after three matches at night but had no problem making the adjustment and is the oldest man to reach the quarter-finals here since Ken Rosewall in December 1977.
The 36-year-old said: "I thought he played very well. Fast conditions, you have to have quick ideas and execute well and I think he did that very well.
"I had a hard time breaking through until two sets to love and a break. Credit to him for playing a great tournament, that's what I told him at the net."
Berdych has been flying under the radar this fortnight but, after beating Juan Martin del Potro in straight sets, he followed up with an impressive 6-1 6-4 6-4 victory over Fabio Fognini.
"We might go out for a nice dinner but she's left already... She might have other plans!"
— #AusOpen (@AustralianOpen) January 22, 2018
- @RogerFederer on how he'll spend his night off with his wife 😂#AusOpen pic.twitter.com/s5P7WPosdT
