Jim Courier couldn't help but take a cheeky dig at Alex de Minaur over fiancee Katie Boulter's absence from his loss to Jannik Sinner in the Australian Open quarter-finals on Wednesday night. De Minaur was blown off the court in a masterclass from Sinner,

Sinner broke the 25-year-old’s serve on six occasions and only faced one break on his own, which he repelled, with De Minaur landing just 51 per cent of his first serves and being on the wrong end of a lopsided 27-10 winners count.

The defending champion has put to bed any concern about his health after demolishing the Australian in under two hours.

Defending champion Jannik Sinner dismissed eighth seed Alex de Minaur 6-3 6-2 6-1 to reach the Australian Open semi-finals and extend the country's decades-long wait for another homegrown singles winner at the Grand Slam on Wednesday.

It's been 23 years since an Australian man has won a grand slam title. When Lleyton Hewitt won Wimbledon in 2002, his second major at 21 years of age, there looked to be plenty of Aussie success to come at grand slams.

After telling fans on the weekend his "legs are back", Alex de Minaur proved it on his way to the Australian Open quarterfinals.

Alex de Minaur’s mum was all of us as she watched her son move through to the quarter-finals of the Australian Open for the first time.

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. And Wednesday's cooler weather might act as a hindrance to the Aussie star's hopes of progressing.