An injured Novak Djokovic has quit after dropping the first set of his Australian Open semifinal against Alexander Zverev. Djokovic lost the opening set 7-6 (5) in a tiebreaker Friday and immediately walked around the net to concede the match to Zverev. Fans booed as Djokovic walked off toward the locker room, and he responded by giving two thumbs-up. Djokovic, who was bidding for an 11th championship at the Australian Open and record 25th Grand Slam title overall, hurt his left leg during his quarterfinal victory against Carlos Alcaraz. The No. 2-seeded Zverev reached his third Grand Slam final and first at Melbourne Park.
