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,

Alexander Zverev chided the crowd after they booed Novak Djokovic for retiring due to injury after the first set in an Australian Open semifinal.

Novak Djokovic wrote a heartfelt message to Alexander Zverev on Instagram after his injury retirement in the Australian Open.

Injured Djokovic decides not to continue after losing first set as Zverev reaches his first Australian Open final

Novak Djokovic retired injured after losing the opening set of his clash with Alexander Zverev on Friday, sending the German to a first Australian Open final where he will take on defending champion Jannik Sinner for a maiden Grand Slam title.

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!

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

Alexander Zverev had a classy response to Novak Djokovic's medical retirement on Friday. Zverev won the first set of his semifinal match against Djokovic

Novak Djokovic and Alexander Zverev both responded after Djokovic was booed by fans after retiring during their Australian Open semifinal match

Jannik Sinner of Italy holds the Norman Brookes Challenge Cup aloft after defeating Alexander Zverev of Germany in the men’s singles final at the Australian Open tennis championship in Melbourne, Australia,

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