Defending champion Jannik Sinner has moved into the quarterfinals at the Australian Open after beating Holger Rune during a match slowed down by medical timeouts for each player and a delay because the net got knocked loose.

The World No. 1, despite feeling unwell in sweltering conditions, kept up his title defense with a four-set triumph.

Defending champion Jannik Sinner moved into the Australian Open quarterfinals at Melbourne Park on Monday by eliminating the 13th-seeded Holger Rune 6-3, 3-6, 6-3, 6-2.

Elina Svitolina of Ukraine gestures during ... Jannik Sinner of Italy reacts during his fourth round match against Holger Rune of Denmark at the Australian Open tennis championship in Melbourne ...

Rune, a 21-year-old from Denmark ... 1-6, 6-3, and now plays Elina Svitolina, a 6-4, 6-1 winner against Veronika Kudermetova. The other women’s matches Monday were Emma Navarro vs.

First came the medical timeouts, one each for Jannik Sinner and Holger Rune with the temperature ... and now plays Elina Svitolina, a 6-4, 6-1 winner against Veronika Kudermetova.

Earlier in the day, Iga Swiatek cruised past Emma Navarro 6-1, 6-2 in their Women’s Singles quarter-final while Madison Keys secured a surprising 3-6, 6-3, 6-4 victory over Elina Svitolina to set up a meeting with Swiatek tomorrow.

Imperious Iga Swiatek swept into an Australian Open semi-final against Madison Keys on Wednesday while Jannik Sinner's powers of recovery will be tested to the limit when he faces home

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.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.

The last of the Australian Open men's quarterfinals takes place in the wee hours of Wednesday morning, in the United States.

Tennis Focus, Grand Slam, Hot Topics The quarterfinals conclude on Wednesday in Melbourne. As per Ravi Ubha, Iga Swiatek has dropped fewer games through four rounds this fortnight (11) than