Sinner powers on to Australian Open quarter-finals, Keys exits

One champion survived and another succumbed at the Australian Open on Monday as Jannik Sinner reached the quarterfinals after women’s holder Madison Keys crashed out at the hands of friend Jessica Pegula.

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Sinner became the second Italian into the last eight after Lorenzo Musetti beat an injury-hampered Taylor Fritz, while Iga Swiatek sent the last Australian out of the women's draw with a 6-0 6-3 thumping of qualifier Maddison Inglis.

Two days after suffering dramatic cramps in a third round scare against Eliot Spizzirri, Sinner rebounded with a

6-1 6-3 7-6(2) win

over fellow Italian Luciano Darderi as the heat returned to Melbourne Park.

With the sun having retreated in the late afternoon, the double-defending champion was relieved to play in the shade at Margaret Court Arena on a day when temperatures reached 33 degrees Celsius (94F).

"It's definitely a bit different when there is no sun, even if it's quite warm outside still," said Sinner, who booked his ninth successive Grand Slam quarterfinal.

"So I felt quite good out there physically. Everything was okay today."