Williams withdrew with a left knee injury, tournament officials said. It is the second consecutive WTA event in which the American has been unable to continue, after her retirement from last week's tournament in Indian Wells with a viral illness.
Naomi Osaka is the first woman to win two major championships in a row since Williams picked up four straight in 2014-15 and has clearly marked herself as tennis' new star.
Karolina Pliskova advances to meet Naomi Osaka in the semifinal.
Serena Williams crushed Ukrainian teenager Dayana Yastremska 6-2, 6-1 as she marched towards an eighth Australian Open title.
Serena Williams was relentless in her first appearance at Melbourne Park since winning the title in 2017, losing only five points in the opening set on her way to a 6-0, 6-2 win over Tatjana Maria in just 49 minutes.
Frenchman Mouratoglou, who has guided Williams to the last 10 of her 23 Grand Slam titles, felt the American great was in “decent shape” when she reached last year’s finals at Wimbledon and the US Open.
Roger Federer took the honours in the much-anticipated mixed doubles clash with fellow great Serena Williams in what the latter described as the "match of her career" at the Hopman Cup in Perth, Australia.
Indictments announced as Dutch security services said they had thwarted a cyber attack on the global chemical weapons watchdog, the OPCW involving Russian suspects and after Britain and Australia blamed the GRU for global hacking plots.
The "Herald Sun," owned by News Corp, first published the caricature of Williams with exaggerated lips and tongue and curly hair rising from the top of her head as she stomped on her tennis racket on Monday.
Osaka showed nerves of steel to secure the biggest win of her life and become Japan's first Grand Slam singles champion but the 20-year-old's triumphant moment was lost in the controversy surrounding Williams.
Six-time champion Serena Williams roars into the final with an emphatic 6-3, 6-0 over Anastasija Sevastova, seeking to add to her 23 Grand Slam titles for the first time since the birth of her daughter Olympia.
Madison Keys clinched her second consecutive semifinal berth by beating Carla Suarez Navarro 6-4 6-3 while Novak Djokovic beat Australian John Millman 6-3 6-4 6-4.
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