Maria Sharapova stunned defending champion Caroline Wozniacki to sweep into the Australian Open last 16 Friday and join ice men Rafael Nadal and Roger Federer, who clinically disposed of their opponents.

The Russian five-time Grand Slam winner, who has struggled since returning from a drugs ban in 2017, was at full throttle in ending the Dane's dream of a second major title.

Sharapova won 6-4, 4-6, 6-3 with the roof closed on Rod Laver Arena and will next play in-form local hope Ashleigh Barty, who bounced Greece's Maria Sakkari, for a berth in the quarter-finals.

Second seed Nadal called young Australian Alex de Minaur "one of the best in the world" ahead of their evening clash, then proceeded to hand him a tennis lesson, dismantling the teenager 6-1, 6-2, 6-4.

Nadal's reward is a meeting with Tomas Berdych, who rallied to beat Argentine 18th seed Diego Schwartzman 5-7, 6-3, 7-5, 6-4.

The Czech veteran reached the semi-finals in 2014 and 2015 but is unseeded this year as he returns from a back injury that almost forced his retirement last year.

Swiss great Federer was also on fire in taming big-serving American Taylor Fritz 6-2, 7-5, 6-2 to stay on track for a third successive title at Melbourne Park and a 21st Grand Slam crown.

On a rain-affected day that delayed play on outside courts, the 37-year-old showed no mercy to the 21-year-old in his 100th match on the centre court in Melbourne.

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