Iga Swiatek booked her second Australian Open semi-final with another spectacular display on Wednesday while Americans reached the last four of the men's and women's singles at Melbourne Park for the first time in 16 years.

Swiatek’s latest lopsided win came via a 6-1, 6-2 scoreline in the quarterfinals against No. 8 seed Emma Navarro on Wednesday.

Jannik Sinner and Iga Swiatek were both subject to doping cases last year, which has overshadowed their participation at the Australian Open.

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.

Defending champion Jannik Sinner put any illness worries to bed by crushing home hope Alex de Minaur in a straight-sets rout to tee up an Australian Open semi-final against Ben Shelton. The Italian world number one showed no signs of the health issues that hampered him in his last match to emphatically fly past the eighth seed 6-3,

Iga Swiatek is dominating her Australian Open opponents the way no one has at Melbourne Park since Maria Sharapova in 2013.