World number one Carlos Alcaraz is out of the Australian Open after suffering a leg injury in pre-season training.
The 19-year-old Spaniard became the youngest men’s world number one in history after winning his maiden Grand Slam at the US Open in September.
He had been due to play in the Kooyong Classic next week before the Australian Open begins on 16 January.
Alcaraz became the youngest man to hold the world number one position following his victory over Casper Ruud in the US Open final in New York four months ago.
His absence at the Australian Open means compatriot and defending champion Rafael Nadal is set to be the men’s top seed at Melbourne Park.
An abdominal injury ruled Alcaraz out of the season-ending ATP Finals and Davis Cup towards the end of 2022.