Novak Djokovic is out of the Australian Open in stunning fashion. The 24-time slam champion medically retired immediately after dropping the first set of his semifinal match against No. 2 Alexander Zverev in a tiebreak 7-6 (5).

Djokovic’s four-set victory over his young rival sets up a semifinal with second-seeded Alexander Zverev and keeps alive his hope of a record 25th Grand Slam title.

Novak Djokovic is booed off court by some fans after retiring injured from his Australian Open semi-final against Alexander Zverev.

An injured Novak Djokovic quit because of a torn muscle in his left leg after dropping the first set of his Australian Open semifinal against Alexander Zverev on Friday. Djokovic lost the opener 7-6 (5) and immediately walked around the net to concede the match to Zverev and shake hands.