Jannik Sinner will face his trickiest test yet at the Australian Open when the defending champion battles Dane Holger Rune in the fourth round on Monday, while five-times Grand Slam winner Iga Swiatek will be the heavy favourite against lucky loser Eva Lys.

Here are three questions after Iga Swiatek needed just an hour to advance to the third round of the. She'll face a familiar foe next.

Raducanu is through to the Australian Open third round for the first time and plays the five-time grand slam winner