- Novak Djokovic came into Australian Open languishing at No 14 in the world
- Serb beat Donald Young, Gael Monfils and Albert Ramos-Vinolas in first three
- Hyeon Chung proved more of a test, with the Korean racing to a two-set lead
- Djokovic battled hard in third set but 21-year-old proved too much for him
- Chung was in amazing form to book place against Tennys Sandgren in last eight
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.
Novak Djokovic sighs after losing a point against South Korea’s young talent Hyeon Chung
Chung produced a magnificent performance to beat Djokovic in straight sets on Monday
The 21-year-old will face world No 97 Tennys Sandgren in last eight after each shocked a seed
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.
More to follow.