- Tag results for Australian Open
Serna Williams beats Halep in an epic three-setter to set up a last eight clash with Czech eighth seed Karolina Pliskova.
Zverev erupted in the second set of a 6-1, 6-1, 7-6 (7/5) fourth-round humiliation by Canadian 16th seed Milos Raonic, hammering his racquet into the ground eight times to leave it a mangled mess.
Karolina Pliskova triumphed 6-3, 6-1 to set up a last eight meeting with either world number one Simona Halep or 23-time Grand Slam champion Serena Williams.
Ash Barty will became the first local hope to play in the last eight at the Australian Open in a decade when she faces Czech rival Petra Kvitova on Tuesday.
Zverev was tipped as a future Grand Slam champion after a breakthrough 2018 that saw him win the ATP Tour Finals, beating Novak Djokovic and Roger Federer in the process.
The world number 44 beat Stephens 6-7 (3/7), 6-3, 6-3 to set up a last eight clash with another American, Danielle Collins who knocked second seed Angelique Kerber.
Bautista Agut began his season by beating Novak Djokovic en route to the Doha title and now faces Stefanos Tsitsipas for a place in the semi-finals.
Former world number one Murray bowed out of the Australian Open on Monday for potentially the last time after saying his longstanding hip pain was too much to bear.
Australian Open: Naomi Osaka sets up Elina Svitolina last-eight test, Serena Williams faces showdown
The victory left Osaka with a last-eight clash against ambitious Ukrainian Svitolina, who battled past American Madison Keys 6-2, 1-6, 6-1.
Tiafoe -- who at the age of 20 had already caused the shock of the first round in stunning fifth seed Kevin Anderson -- registered a second notable scalp on his 21st birthday.
The NextGen Finals winner stunned the world number three, who is 17 years his senior, 6-7 (11-13), 7-6 (7/3), 7-5, 7-6 (7/5) on Rod Laver Arena.
Two-time defending champion Roger Federer loses to Stefanos Tsitsipas in Australian Open's 4th round
The 20-year-old NextGen Finals champion beat Federer, who is 17 years his senior, 6-7 (11-13), 7-6 (7/3), 7-5, 7-6 (7/5) on Rod Laver Arena.
Nadal, who is aiming to become the first man in the Open-era to win all four Slams twice if he can add to his 2009 Aussie crown, agreed Berdych had finally come to the party in the third set.
Collins humiliated the German three-time major champion 6-0, 6-2 in less than hour to reach the quarter-finals on her debut appearance in the Melbourne Park main draw.
Ukrainian sixth seed Svitolina revealed last week that she is dating French star Monfils after he was spotted in her player box at the Australian Open.