Jannik Sinner is through to the Australian Open quarterfinals after a drama-filled fourth-round win over Holger Rune. World No. 1 Sinner won in four sets, 6-3. 3-6, 6-3, 6-2, but this did not tell the story of a contest defined by illness.

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

MELBOURNE – If someone is required to dismantle a nation’s hopes, then Jannik Sinner is a fine choice. He will do it without fuss. He will not beat his chest, prance in victory or even grunt. He will simply not miss. He will bring cold calculation, a Gatling-gun forehand, a face that tells you nothing and puncture your challenge.

Lorenzo Sonego will take on American Ben Shelton in the other men’s quarter-final on Jan 22. Read more at straitstimes.com.

In the quarterfinals, Sinner will face No. 8 Alex de Minaur of Australia, who ousted American Alex Michelsen 6-0, 7-6 (5), 6-3. It will be the first quarterfinals appearance for de Minaur in his home country's Grand Slam, and he became just the third Aussie man to reach the round in 20 years.

Jannik Sinner has revealed that he felt unwell ahead of his win over Holger Rune at the Australian Open, and is relieved to be through to the quarter-finals.

Jannik Sinner came through a gruelling match against Holger Rune at the Australian Open, but there were concerns over his health during the clash as he admitted he was not feeling well before the encounter even got underway.