Naomi Osaka's title defence was over in third round with a 5-7, 6-7 (2), 6-4 loss to Leylah Fernandez, an 18-year-old from Canada who is ranked 73rd and never had been this far in Grand Slam competition.
Defending champion Roger Federer, world number two Angelique Kerber and five-time Grand Slam winner Maria Sharapova were all crashed out of the Australian Open.
Gutsy Andy Murray fought to the end before losing an epic farewell match at the hands of Roberto Bautista Agut. But it was business as usual for ruthless Roger Federer and Rafael Nadal, who joined Caroline Wozniacki in round two.
Angelique Kerber and Alexander Zverev both won their singles matches against Spain to give Germany a winning start to their Hopman Cup campaign.
Angelique Kerber won her first championship at the All England Club beating Serena Williams 6-3, 6-3. Separately, Novak Djokovic delivered a semi-final win over Rafael Nadal in a two-day thriller that lasted five hours and 15 minutes.
On 20-match winning streak at Wimbledon, Williams will face German world number 10 Angelique Kerber on Saturday in a repeat of the 2016 showpiece won by Williams.
The carnage of seeds at the world's premier grass court tennis tournament continued, with only one of the top 10 women's seeds remaining in the tournament at the fourth round.
Nadal and Djokovic have played each other 50 times, but their last meeting came more than a year ago, when Nadal won in the Madrid Open semifinals. Djokovic leads Nadal 26-24 overall, but Nadal holds a 13-7 advantage on clay.
More than seven years after appearing in her first Grand Slam final at the 2009 US Open, Wozniacki can finally erase the "but never won a major" footnote that has long been attached to her resume.
Hyeon Chung is the first Korean to reach the last four of a Grand Slam. On the women's side, Germany's Angelique Kerber Kerber is the only Grand Slam singles champion still in the draw.
The 2016 winner, seeded 21, brushed aside Madison Keys, 6-1, 6-2, breaking her much-vaunted serve at will as she triumphed in 51 one-sided minutes at Rod Laver Arena in Melbourne.
Angelique Kerber is the only Grand Slam singles winner still on track in the Australian Open women's draw. On the men's side, Roger Federer is in cruise control.
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