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

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

Defending champion Jannik Sinner has moved into the quarterfinals at the Australian Open after beating Holger Rune during a ...

The defending champion moved into the quarterfinals at Melbourne Park on Monday by eliminating the 13th-seeded Rune 6-3, 3-6, ...

No. 19 seed Madison Keys scored the big upset on Day 9 of the Australian Open, defeating No. 6 Elena Rybakina 6-3, 1-6, 6-3 ...

Elina Svitolina of Ukraine gestures during her fourth round match against Veronika Kudermetova of ... (AP Photo/Manish Swarup) Jannik Sinner of Italy reacts during his fourth round match against ...

World No.1 and defending champion Jannik Sinner, Iga Swiatek, Elena Rybakina and other big players will be in action on Day 9 ...

World No. 1 Jannik Sinner fought through blistering heat and an undisclosed ailment to defeat Holger Rune 6-3, 3-6, 6-3, 6-2 ...

Defending Australian Open champion Jannik Sinner stumbled early Thursday ... beat Erika Andreeva (RUS) 6-2 6-3 Veronika ...

Jannik Sinner battled through illness to reach the quarter-finals of the Australian Open on Monday as his Italian compatriot ...

But she's struggling here as Veronika Kudermetova takes the first three points. Sinner 2-2 Schoolkate* Tristan Schoolkate isn't making this easy for Jannik Sinner in these opening stages and he ...

of Jasmine Paolini v Renata Zarazua Defending champion Jannik Sinner beats world number 173 Tristan Schoolkate 4-6 6-4 6-1 6-3 GB's Katie Boulter loses 7-6 (7-3) 2-6 6-2 to Veronika Kudermetova in ...