Spectators booed an injured Novak Djokovic as he left the court in Rod Laver Arena after quitting one set into his Australian Open semifinal against Alexander Zverev on Friday. Dealing with a what he said was a torn muscle,

For Djokovic, the withdrawal means that he won't win his record 25th major title and 11th Australian Open. Injuries have prevented him from finishing two of his past four Grand Slam tournaments. He withdrew from last year's French Open before the quarterfinals due to a torn meniscus in his right knee.

John McEnroe ripped into the Australian Open crowd following the Novak Djokovic and Alexander Zverev match, declaring their boos for the Serb "ludicrous." After overcoming Carlos Alcaraz on Tuesday despite a left leg injury, the record 10-time champion at Melbourne Park managed to take to the court on Friday.