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.

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.

Novak Djokovic's bid for 11th Australian Open title ends after a muscle tear in his left leg. He says injury happened during match vs. Carlos Alcaraz.

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

Alexander Zverev urges fans not to boo Novak Djokovic, who retired in the Australian Open Semifinals due to injury

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!

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