Williams left the court to receive medical attention. After returning, with the match now tied at 3-3, Williams buckled at the baseline midpoint before gingerly walking off the court in tears, acknowledging the fans as she departed.
"I was heartbroken to have to withdraw today after injuring my right leg," said Williams in an
Instagram post. "My love and gratitude are with the fans and the team who make being on centre court so meaningful.
"Feeling the extraordinary warmth and support of the crowd today when I walked on -- and off -- the court meant the world to me," said Williams, who was aiming to win a record-tying 24th grand-slam title.
The forfeit marks her first ever first-round loss at
Wimbledon.