Katie Boulter had an adorable message for a fellow tennis power couple after they won matches on the same day at the Australian Open. Gael Monfils and Elina Svitolina both upset the No. 4 seeds in the men’s and women’s singles draws in back-to-back matches on Margaret Court Arena.

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.

Pat Rafter has warned Alex de Minaur to batten down the hatches as he strives to enter uncharted waters at the Australian Open.

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

As much as any top player, Sinner has been able to expose De Minaur’s lack of first-strike weaponry. The Aussie’s strength is his scrambling and counterpunching, but Sinner serves too well, hits too hard, places the ball too precisely for his defense to be effective. De Minaur hasn’t found a way to hurt, rattle, of disrupt him.

Follow live text and radio commentary as Alex de Minaur plays Alex Michelsen in the Australian Open fourth round.

The Australian Open quarter-finals are heating up as Jannik Sinner, battling illness, faces Australia's Alex De Minaur. Meanwhile, Iga Swiatek enters her match free of doping appeals. Experienced players Madison Keys and Elina Svitolina also showcase their adaptability in women's top matches.

Alex de Minaur has given a cheeky sledge to his fiancee Katie Boulter about their wedding ahead of the biggest match of his career. Welcome to news.com.au’s live coverage of Day 11 of the Australian Open.

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

The American rallied from a set down to reach the last four in Melbourne for the third time, and will face No. 2 seed Iga Swiatek next.

Worrying claims from Corentin Moutet that he fainted before his match, Alex de Minaur shows his fighting ... Ukraine's 28th seed Elina Svitolina. “I think I warmed up the court for her," Monfils ...