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. The AP’s Howard Fendrich explains.

Djokovic quits mid-match and walks off to boos, putting Zverev in Australian Open final

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. The AP’s Howard Fendrich explains.