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.

The quarterfinals are underway at Melbourne Park, as rumours abound about Jannik Sinner's health ahead of his clash with Alex de Minaur. Follow live.

The Australian Open quarter-finals continue on Wednesday and top seed Jannik Sinner's task of defending his crown is not getting any easier. The Italian is recovering from an illness and will face Australia's last hope Alex De Minaur,

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

Usually it's fiancee Katie Boulter who draws all the attention in Alex de Minaur's player's box at the Australian Open. But on Monday night it was his mum Esther who stole the show in a viral moment.

Jannik Sinner disposed of Holger Rune in four sets in the fourth round of the Australian Open as the World No. 1 player looks to make it back-to-back Grand Slam

Jelena Dokic has warned Alex de Minaur against putting too much focus into the health of opponent Jannik Sinner for their quarter-final clash at the Australian Open. De Minaur advanced to the final eight of his home grand slam for the first time on Monday night, beating American Alex Michelsen 6-0 7-6 (7-5) 6-3.

In the Round of 16 at the Australian Open on Sunday, Alex de Minaur (ranked No. 8) meets Alex Michelsen (No. 42).In his most recent match on Friday, Michelsen knocked off Karen Khachanov in three

Ben Shelton advanced to the semi-final of the hard court major after beating Lorenzo Sonego 6-4, 7-5, 4-6, 7-6 (7-4) at the Rod Laver Arena on Wednesday.

Ben Shelton's Australian Open quarterfinal foe, Lorenzo Sonego, produced the shot of the tournament — diving to his left for a volley with so much spin that the ball bounced on one side of the net, then floated back over to the other — but it was the American who ended up with the victory Wednesday.

Alex de Minaur has entered this year's Australian Open as a top-8 seed for the first time in his career. After reaching the quarter-finals of Roland-Garros, Wimbledon and the US Open last season, the Aussie will look to go deep at his home tournament.