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’s quest for a record 25th grand slam title has been cut short at the Australian Open after he stunningly retired from his semifinal match due to a left leg injury.

Toni Nadal, Rafael Nadal's uncle and once coach, questioned the legitimacy of Novak Djokovic's hamstring injury that led to his withdrawal from the Australian Open semi-final. He suggests Djokovic should have taken a medical time out before quitting and references Djokovic's history of playing through injuries with apparent normality despite showing pain.