Australian Open updates: Defending champion Roger Federer beaten by Stefanos Tsitsipas
Ashleigh Barty also through to quarter-finals after defeating Maria Sharapova
Young Stefanos Tsitsipas signalled a changing of the guard at the top of world tennis as he shocked defending champion Roger Federer in the Australian Open fourth round on Sunday.
The 20-year-old NextGen Finals champion beat Federer, who is 17 years his senior, 6-7, 7-6, 7-5, 7-6 on Rod Laver Arena.
Tsitsipas, seeded 14, became the first Greek in history to reach the quarter-finals of a Slam where he will meet Spain's 22nd seed Roberto Bautista Agut.
"There's nothing really I can say to describe this," the 20-year-old said. "I'm the happiest man on earth right now."
Bautista Agut dumps Cilic out
Roberto Bautista Agut came through a third Australian Open five-setter on Sunday to knock out 2018 finalist and sixth seed Marin Cilic in the fourth round.
The in-form Spanish 22nd seed will play in his first grand slam quarter-final after winning 6-7, 6-3, 6-2, 4-6, 6-4 in two minutes under four hours on Margaret Court Arena.
Bautista Agut began his season by beating Novak Djokovic en route to the Doha title.
He began his Australian Open campaign with an epic five-set win over Andy Murray, in what could be the three-time grand slam winner's last match because of a chronic hip injury.
His second round match against Australian John Millman also went the full distance before a straight-sets third round win against 10th-seeded Russian Karen Khachanov.
On Sunday he ended Croat Cilic's hopes of a repeat match-up against Federer in the quarter-finals after losing to the Swiss master in five sets in last year's final.
Nadal beats Berdych
Rafael Nadal marched through to the quarter-final of the Australian Open on Sunday in emphatic fashion as he defeated Tomas Berdych 6-0, 6-1, 7-6.
The world No 2, who is looking to win the Melbourne title 10 years after his lone success at the grand slam event, will now play world No 39 Frances Tiafoe on Tuesday for a place in the semi-finals.
Tiafoe shocked No 20 seed Grigor Dimitrov as he prevailed 7-5, 7-6, 6-7, 7-5 on the Melbourne Arena.
Meanwhile in the women's draw, 2016 champion Angelique Kerber was thrashed 6-0, 6-2 by American Danielle Collins.
Collins said: "I better have many more of these. I just go out fearless, just give it my all."
Earlier in the day, Ashleigh Barty survived a late renaissance from Maria Sharapova to reach the quarter-finals of the Australian Open on Sunday.
The Australian had looked to be cruising in the final set as she led 4-0.
But Sharapova, the 2008 winner in Melbourne, hit back to cut the gap to 4-3 and then had two break points on the Barty serve to level things.
But the No 15 seed held her nerve and prevailed 4-6, 6-1, 6-4 to set up a quarter-final clash on Tuesday against Petra Kvitova.
Kvitova was on great form as she charged past American Amanda Anisimova 6-2, 6-1 in an one-sided affair.
Updated: January 20, 2019 04:34 PM