In a stunning development at the Australian Open, an injured Novak Djokovic withdrew after losing the first set of his semifinal match versus Alexander Zverev.
Zverev won a grueling first set in a 7–6 tiebreaker that lasted one hour and 20 minutes. Djokovic decided he couldn't continue with a left leg injury that was hindering him throughout the match.
"Please, guys — don’t boo a player when he goes out with injury," Zverev said on-court in his post-match interview. "I know everyone paid for tickets... but Novak has given everything of his life to the sport the last 20 years."