Tsitsipas shows win over Federer no fluke

He was down a break in both the first and third sets before turning them around.

Bautista Agut, whose run to the quarterfinals included victories over Andy Murray, a three-time major champion, and Marin Cilic, the 2014 US Open champion and the runner-up to Federer at Melbourne Park a year ago, had no answer.

"Well, he's a good player, no? He has a good forehand and backhand. He's serving well," Bautista Agut said about Tsitsipas. "I think he knows the game. He knows how to play."

Now the 14th-seeded Tsitsipas gets to continue the best showing of his career, one that marks him as perhaps the sport's next big thing.