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.

Novak Djokovic retired mid-game during his semi-final clash with Alexander Zverev, who'll now face world No.1 Jannik Sinner in the Australian Open final on Sunday

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