An ailing Novak Djokovic crashed out of the Australian Open in the fourth round as up and comer Hyeon Chung clinically took advantage of the six-time champion's elbow injury to win 7-6 (7-4) 7-5 7-6 (7-3).
The Serbian, who had also struggled with his hip in the third round, was on the back foot from the off and failed to claw back the first set before suffering further at the start of the second.
Djokovic's fighting spirit never wavered, but he could not shake off NextGen champion Chung, who was unrelenting en route to claiming the biggest scalp of his career.
Chung – the first Korean male or female to reach a grand slam quarter-final – had said prior to the match that he would "just be happy to share the court with Novak", but he was far from starstruck and an outstanding performance made him a deserved winner - albeit Djokovic, who missed six months before returning to play in Melbourne, was undoubtedly hindered by his injury.
The 21-year-old will now face another shock quarter-finalist in Tennys Sandgren on Wednesday.
Welcome to the big time Hyeon #Chung!— #AusOpen (@AustralianOpen) January 22, 2018
Our six-time champion Novak #Djokovic bows out of the #AusOpen d by the world No.58 in straight sets 7-6(4) 7-5 7-6(3) after 3hrs 21mins. pic.twitter.com/lETvt3JPJC
A series of unforced errors, including numerous double faults, allowed Chung to break Djokovic's serve twice and move 4-0 up in the first set, before the former world number one came roaring back.
Three successive games piled the pressure on Chung and errors crept into the youngster's play as he served for the set, but he battled through to the tie-break and recovered his momentum to take the set.
It was clear that Djokovic, wearing a protective sleeve on his right arm, was struggling with his elbow as he repeatedly failed to hold serve and he received treatment before the second set.
Chung held his nerve in a gruelling first game and broke the 14th seed en route to building a 3-0 lead.
As in the first set, Djokovic's fighting spirit came to the fore as he drew level, but Chung again showed great resolve and he moved two sets ahead when a stunning rally ended with the groaning 30-year-old finding the net.
A topsy-turvy third set followed, bringing the crowd to its feet as four of the first five service games were broken to leave the pair neck and neck.
Both players missed big opportunities to then take control of proceedings and a number of poorly telegraphed drop shots from the world number 58 ensured Djokovic remained in the match.
But Chung kicked off the tie-break with two superb points and, although again there was a strong response, he continued to confound Djokovic with some astounding returns to seal a huge win.
Chung bt Djokovic  7-6 (7-4) 7-5 7-6 (7-3)
Chung – 47/37
Djokovic – 36/57
Chung – 1/2
Djokovic – 2/9
BREAK POINTS WON
Chung – 6/10
Djokovic – 5/19
FIRST SERVE PERCENTAGE
Chung – 67
Djokovic – 62
PERCENTAGE OF POINTS WON ON FIRST/SECOND SERVE
Chung – 65/47
Djokovic – 65/39
Chung – 138
Djokovic – 128
21. Februar 2018
|Ronaldo jets off for a break as Madrid head to Leganes|
|Bastareaud back in one of five France changes|
|Mistake to let Kroos leave Bayern for Madrid - Sammer|
|Short´s fifty and Agar´s spin seal deserved Australian tri-series win|
|Spalletti tips Ancelotti for Italy job|
|I can´t wait for retirement - Federer|
|Mendy on course for World Cup, says Deschamps|
|Man Utd on dismal knockout run, Roma have Shakhtar curse - Champions League in Opta numbers|
|Azpilicueta hoping for greater fortune at Camp Nou|
|Out of nothing he can score goals – Heynckes hails Muller|
|CONCACAF Champions League Review: Giovinco inspires Toronto, Tigres held|
|Steelers LB Shazier says he´s ´best linebacker ever´|
|Ranieri: I´ll quit Nantes if offered Italy job|
|Thiem keeps title defence on track, Monfils saves match point in Rio|
|Barcelona are great even without Neymar – Willian|
|Del Potro, Raonic progress at Delray Beach|
|Dolphins place franchise tag on Landry|
|Colts QB Luck ´extremely optimistic´ about shoulder rehab|
|Conte wants to see out Chelsea contract but has bags packed|
|A´s respond to Gruden´s belittling of Oakland|
|Yankees acquire Drury in three-team deal with Diamondbacks, Rays|
|Messi goal will give Barcelona more space at Camp Nou – Suarez|
|Serena Williams: I almost died|
|Conte defends ´incredible´ Christensen after Barcelona error|
|Bayern taking nothing for granted after 5-0 demolition – Heynckes|
20. Februar 2018
|Valverde: Barcelona away goal not definitive for progression|
|Muller & Robben bemoan poor first half despite Bayern rout|
|Ivashka sets up Wawrinka Marseille meeting|
|Chelsea close to a perfect game against Barcelona - Conte|
|Defending for 90 minutes at Barcelona a ´suicide mission´ - Fabregas|
|Championship Review: Villa miss chance to move into promotion places|
|Messi ends his Chelsea hoodoo|
|Texans release all-time leading tackler Brian Cushing|
|Chelsea 1 Barcelona 1: Messi breaks Blues hoodoo to leave tie in the balance|
|Bayern Munich 5 Besiktas 0: Two-goal Muller inspires emphatic win after Vida red|
|Woods and Stricker appointed USA Ryder Cup vice-captains|
|Wales must attack Sexton and Murray - Gatland|
|De Vrij confirms intention to leave Lazio on free transfer|
|Sanchez move down to Champions League frustration at Arsenal - Mourinho|
|Mourinho suggests Pogba is fit to face Sevilla|
|Clinical Kerber strolls past Strycova in Dubai|
|AFC Champions League Review: Hulk & Oscar lead Shanghai, Jeonbuk Motors hit six|
|Cech expects Ospina to start for Arsenal in EFL Cup final|
|Gueye signs new Everton deal until 2022|
|FA charges Man City and Wigan for failing to control players|
|Aguero faces no action over Wigan fan incident|
|Martin released by Buccaneers|
|Las Palmas get green light to sign Viera replacement amid Nasri talk|
|De Kock, De Villiers & Du Plessis looking to Australia Tests|
|FA issues West Ham with anti-doping charge|
|Florenzi a doubt to face Shakhtar, confirms Roma´s Di Francesco|
|Maybe we ´lock him up or tie him up´ – Montella ponders how to stop Sanchez|
|French rugby crisis could last a long time - Magne|
|Pogba and Ibrahimovic train with Man Utd ahead of Sevilla tie|
|Zidane hints at resting Ronaldo for Real Madrid´s trip to Leganes|
|Biggar, Halfpenny and Williams return to Wales´ starting XV|
|Modric adds to Real Madrid injury worries|
|Braehmer pulls out of Super Series semi-final|
|Wolfsburg turn to Labbadia in fight for Bundesliga survival|
|Hales follows Rashid in signing white-ball deal|
|Wigan to investigate pitch invasion after win over Manchester City|
|Drogba ´couldn´t be more proud´ as son signs for Guingamp|
|Stones making no excuses for shock Wigan defeat|
|Bellugi scathing of Inter form and transfer policy|
|Ringrose could make Six Nations impact after comeback|
|Rakitic: I´ve not seen Messi in the gym this often|
|Winter Olympics 2018: Slovenian ice hockey star Jeglic sent home after positive doping test|
|Sevilla v Manchester United: Montella and Mourinho unified in pursuit of identity|
|Besiktas face Bayern test, Messi seeks to end drought - Champions League in Opta numbers|
|Jose Morais: The Mourinho acolyte bringing Barcelona to Barnsley|