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, who retired due to injury after the first set, was booed by the crowd as he walked off Rod Laver Arena.

Novak Djokovic is recovering from an injury that left him unable to claim his 11th Australian Open victory. On Friday afternoon, local time, the Serbian tennis player, 37, arrived for his semifinal against Alexander Zverev with his left leg heavily taped, having torn a muscle during Tuesday’s win over Carlos Alcaraz.