In a stunning development at the Australian Open, Novak Djokovic withdrew because of injury after losing the first set of his semifinal match versus Alexander Zverev. Zverev, the No. 2 seed, won a grueling first set in a 7–6 tiebreaker that lasted one hour and 26 minutes.

Djokovic sustained a muscle tear in his upper left leg during his quarter-final victory over Carlos Alcaraz on Tuesday and admitted he did not have anything left in the tank after attempting to play through the pain.

Novak Djokovic retired injured after losing a gruelling first set of his Australian Open semifinal to Alexander Zverev, leaving his bid for a record 25th Grand Slam crown in tatters on Friday. The 37-year-old Serbian great’s upper left leg was again heavily taped after he hurt it in the quarter-finals and he called time after going down 7-6 (7/5).