The 2016 champ routed Maria Sharapova 6-1, 6-3 in a third-round win that showcased her credentials as a title contender and ensured she'll be the only Grand Slam champion still playing in the second week in the women's draw.
Japan's Naomi Osaka ousted home hope Ashleigh Barty 6-4 6-2 to reach the round of 16 for the first time in eight grand slam appearances.
Muguruza broke back twice but Hsieh, who works closely with former Australian Open tournament director Paul McNamee, ran away with the tiebreak 7-1.
American Sam Querrey lost his second-round match 6-4, 7-6 (6), 4-6, 6-2 to 80th-ranked Marton Fucsovics.
Chung beat fourth-seeded Alexander Zverev 5-7, 7-6 (3), 2-6, 6-3, 6-0 in the third round on Rod Laver Arena. Angelique Kerber of Germany celebrates winning against Maria Sharapova of Russian Federation.
The 26-year-old Romanian world number one, seeking her first Grand Slam title, turned her ankle in her first-round win over Destanee Aiava.
In what shapes as an entertaining showdown, he'll meet No. 17-seeded Nick Kyrgios, who had a 7-5, 6-4, 7-6 (2) win over Viktor Troicki, in the next round.
As was the case for Federer, Djokovic's previous competitive tournament was Wimbledon a year ago, where he was forced to retire in his quarter-final match against Tomas Berdych due to an elbow injury. "I kinda want sharapova to win tomorrow", the tweet read. The world No 76 had three straight match points before losing 4-6 6-4 15-13 in what was the joint longest women's match here in the modern era.
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"SO impressed with the great effort from @LaurenDavis93 and @Simona_Halep Both deserved to win that match", said Evert, who won the Australian Open in 1982 and 1984. "Both ladies should be so proud-kept digging deeper when it looked like there was nothing left in the tank!" "I just wanted to play the match", said the two-time Melbourne quarter-finalist, who faces unseeded American Lauren Davis in the third round on Saturday.
Sixth seed Karolina Pliskova recorded 31 winners, including 11 aces, to beat fellow Czech Lucie Safarova 7-6 (6) 7-5 in the third round.
Kerber, who plummeted down the rankings past year after finishing the previous campaign at number one, broke Sharapova's serve in the first game of the match and that set the tone.
"I maybe could have done things better but at the end, she deserves to win", she said.
"It's unbelievable to make the fourth round again after 10 years", the world No. 88 said after the win.
Keys will next play the victor of Saturday's later match between Aliaksandra Sasnovich and eighth-seeded Caroline Garcia.
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