Alex de Minaur's Australian Open fourth-round opponent Alex Michelsen has a hip injury he received a medical timeout for in his previous match.

Alex de Minaur, the world No. 8, and Nick Kyrgios, who is back after a two-year battle with knee and wrist injuries, are the headliners for their country at Melbourne Park. Kyrgios emceed the night session on John Cain Arena Monday, before De Minaur headlines Rod Laver Arena, the pantheon of Australian tennis Tuesday night.

Alex de Minaur busted through his Australian Open fourth-round ceiling with a brutal display against Alex Michelsen. Now, a date with world No. 1 Jannik Sinner looms.

Watch the match highlights between Alex Michelsen & Alex de Minaur in Round 4 of the 2025 Australian Open Men's Singles Tournament Tennis.

It was the opening round of the 2017 Australian Open in de Minaur’s first main draw at his first major championship in his home country, when the then-17-year-old saved a match point in the fourth set before beating Gerald Melzer in five sets and almost four hours.

Alex de Minaur has reached the Australian Open quarter-finals for the first time, setting up an epic last-eight match with world no.1 and reigning champion Jannik Sinner.