Seven-times Grand Slam champion Venus Williams pulled out of this month's Australian Open due to injury, the organisers of the season's first Grand Slam said on Saturday.
Williams was set to play her 22nd Australian Open after being awarded a wildcard to the January 16-29 tournament.
The 42-year-old American, twice a finalist at Melbourne Park who is now ranked outside the top 1,000, was preparing for the tournament at the Auckland Classic, where she got injured.
"Venus Williams has withdrawn from the Australian Open due to an injury sustained at the ASB Classic in New Zealand," the Australian Open said in a tweet.
Williams crashed out of the US Open in the first round with a loss to unseeded Belgian Alison Van Uytvanck. He only returned to action in Auckland, where she downed compatriot Katie Volynets before losing to China's Zhu Lin.
Australia's Kimberly Birrell was awarded her wildcard place.
World number two Iga Swiatek advanced to the second round of the Australian Open on Monday with an unconvincing 6-3 6-4 win against first-time opponent Katerina Siniakova on John Cain Arena.
Jannik Sinner launched his Australian Open title defence with a 7-6 7-6 6-1 win over Nicolas Jarry on Monday in a match that put the players' contrasting doping cases in the spotlight, while Carlos Alcaraz began his bid to complete a career Grand Slam with a 6-1 7-5 6-1 win over Kazakh Alexander Shevchenko.
Manchester United boss Ruben Amorim said his team are still improving, as Sunday's dramatic FA Cup penalty shootout victory over Arsenal points to a more positive future after a difficult start to life at Old Trafford.