Novak Djokovic rounded on his critics after retiring injured in his Australian Open semi-final after the first set against Alexander Zverev to boos from the crowd at the tournament he has won 10 times.
The Serb put on an inspired performance to beat Carlos Alcaraz in the quarter-finals but could not continue on Friday after losing the opener 7-6(5) to Zverev, drawing jeers from some sections of the crowd at
