Novak Djokovic has retired from his Australian Open semifinal against Alexander Zverev after losing the first set in a tiebreak. Djokovic missed a regulation putaway volley on top of the net down 5-6,

Novak Djokovic is out of the Australian Open in stunning fashion. The 24-time slam champion medically retired immediately after dropping the first set of his semifinal match against No. 2 Alexander Zverev in a tiebreak 7-6 (5).

Novak Djokovic vs Alexander Zverev, Australian Open Highlights: The first set went on for more than an hour and Djokovic was looking quite good but he shockingly retired as soon as he lost the first set tie-break.

Alexander Zverev has said that Jannik Sinner is "very similar" to Novak Djokovic after he was defeated by the Italian in the Australian Open final.

Djokovic is out of the Australian Open after retiring from his semi-final, with Zverev through to face Sinner on Sunday

Follow reaction as Sinner retained the championship with a brilliant showing against three-time major final loser Zverev on Rod Laver in Melbourne

Jannik Sinner, a 23-year-old Italian, is the youngest man to leave Melbourne Park with the trophy two years in a row since Jim Courier in 1992-93.

Dominant Jannik Sinner wins Australian Open again as Alexander Zverev ‘not good enough’ - live - Sinner won his second Australian Open with a 6-3 7-6 (4) 6-3 victory to deny Zverev his grand slam titl

Novak Djokovic shared a heartfelt message to Alexander Zverev after the second seed lost in straight sets against Jannik Sinner in the Australian Open final on Sunday at the Rod Laver Arena. Sinner won 6-3,

Defending champion Jannik Sinner will face Alexander Zverev in the Australian Open men's final on Sunday. Sinner is seeking his third Grand Slam title overall.