Tsitsipas shows win over Federer no fluke

Meanwhile, unseeded American Danielle Collins, the world No 35, had never won a Grand Slam match before entering this year's tournament but she stunned three-time major champion and second seed Angelique Kerber in round four.

The 25-year-old continued her fairytale run by bouncing back spectacularly to down Russia's Anastasia Pavlyuchenkova 2-6, 7-5, 6-1 in the quarterfinals.

"Yeah, it's my first time to play in Rod Laver Arena; I didn't even practice here. It was quite the experience. I really love it," said the ecstatic Collins, whose reward is a semifinal against either Czech eighth seed Petra Kvitova or local hope Ashleigh Barty.

Associated Press