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,

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

Zverev will face defending Australian Open champion and No. 1 seed Jannik Sinner, who beat American Ben Shelton 7-6 (2), 6-2, 6-2, in Sunday's final. Zverev is pursuing his first major tournament title.

An injured Novak Djokovic quit because of a torn muscle in his left leg after dropping the first set of his Australian Open semifinal against Alexander Zverev on Friday.

On Sunday, Alexander Zverev will chase his first Major title against Jannik Sinner in the Australian Open final. The German is through to his third Major final, hoping to lift his first notable trophy. Novak Djokovic backed Zverev to defeat Sinner and join tennis immortals!

Facing Sinner reminded Alexander Zverev of trying to solve the challenge presented by the 24-time major champion Djokovic.

Serbian Davis Cup captain Viktor Troicki has demanded Channel Nine commentator Tony Jones be banned from covering tennis for life following controversial comments about Novak Djokovic at the Australian Open.

Novak Djokovic was forced to retire hurt from the Australian Open semifinals - and the Serbian may not be back in action until the French Open.