MELBOURNE - Iga Swiatek will look to continue her march to a maiden Australian Open title on Wednesday while Jannik Sinner's powers of recovery will be tested in a quarter-final against home hope Alex de Minaur.
World number two Swiatek has been imperious so far in Melbourne, dropping just 11 games in four matches, but now faces three-set specialist Emma Navarro.
The winner will have a last-four match-up with Madison Keys or Elina Svitolina, who open the day's proceedings on Rod Laver Arena.
World number one Sinner had dizzy spells in the scorching heat of the afternoon during his four-set win against Holger Rune on Monday.
The defending champion has an evening match against De Minaur with temperatures forecast to drop considerably on Day 11 of the first Grand Slam of the year.
De Minaur is looking to become the first Australian man to reach the semi-finals at his home Open since Lleyton Hewitt 20 years ago.
Awaiting in the last four will be either American 21st seed Ben Shelton or the unseeded Italian Lorenzo Sonego.
Sinner struggled in the muggy conditions against Rune, his hand visibly shaking and his heart rate taken in the third set before he left court for a medical timeout.
"I was not feeling really well. You know, I think we saw that today I was struggling physically," said Sinner, 23.
De Minaur has never beaten Sinner, losing all nine meetings, including in straight sets in the fourth round of the 2022 Australian Open.