Barty is aiming to be the first Australian woman since 1978 to win the Australian title. She will next play No. 25 Karolina Muchova.
That allows the fifth-seeded Tsitsipas to move into the quarterfinals at Melbourne Park for the second time in three years. He will face Rafael Nadal next.
The No. 2-ranked Nadal closed his 6-3, 6-4, 6-2 win over 16th-seeded Fabio Fognini with an ace.
The young Russian entered the men's singles quarter-finals for the first time after a commanding straight-sets win over Mackenzie McDonald.
Top-ranked Djokovic is just the second player to reach the 300-win milestone after Roger Federer.
Rafael Nadal will play Italian veteran Fabio Fognini for a place in the Australian Open quarterfinals on Day 8.
The No. 2-seeded Halep avenged a loss last year at Roland Garros, where Swiatek dropped just three games in their fourth-round match.
With a straight-set win Sunday over third-seeded Dominic Thiem, the U.S. Open champion and Australian Open runner-up in 2020, Grigor Dimitrov advanced to a showdown with Aslan Karatsev.
The No. 18-seeded Dimitrov was down a break in each of the first two sets but rallied to keep up the pressure on the current US Open champion.
Pacer Ishant Sharma provided the perfect start to India as he trapped English opener Rory Burns lbw in the very first over of the innings.
The 23-time Grand Slam champion saw a stiff challenge from Sabalenka as she won the 4th round tie 6-4, 2-6, 6-4.
3rd seed Japanese star defeats 14th seed Muguruza 4-6, 6-4, 7-5 in the fourth round of the Grand Slam.
It is a tricky balance when someone of Norrie’s ilk — the owner of a grand total of six wins in Grand Slam matches — goes up against someone of Nadal’s stature on one of their sport’s biggest stages.
Serena Williams continues her quest for a record-tying 24th Grand Slam singles title when she plays No. 7 seed Aryna Sabalenka in the fourth round.
Nadal is chasing a men’s record 21st major title but entered the tournament with back stiffness and without any competitive matches in 2021.
Barty rallied from 4-2 down in the second set and broke Alexandrova’s serve to make it 4-all on her sixth break point.
Rublev and Medevedev both went unbeaten in the 12-team ATP Cup last week to clinch the title for Russia.
Medvedev had been bothered by a problem with his upper left leg and left the court with a trainer for a medical timeout late in the fourth set.
Bopanna and his Chinese partner Yingying Duan lost 4-6 4-6 to the pair of American Bethanie Mattek-Sands and United Kingdom's Jamie Murray in a first-round match that lasted an hour and three minutes.
The No.1-ranked Djokovic said he might not be able to play his next match, scheduled for Sunday against Milos Raonic.
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