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Swiatek is the first player to make back-to-back finals at Indian Wells and Miami since Victoria Azarenka won the 'Sunshine Double' in 2016.
Barty's potential fourth round matchup against Osaka had been the talk of Melbourne Park.
Osaka will next face Amanda Anisimova, a 20-year-old American who beat Olympic gold medalist Belinda Bencic 6-2, 7-5.
With so much attention on the 11-day saga of Djokovic's attempt to participate in the year's first Grand Slam tournament, the returns of Osaka and Rafael Nadal have been overshadowed.
Defending Australian Open champion Naomi Osaka has withdrawn from her semifinal match at a WTA tournament in Melbourne with an abdominal injury, allowing her opponent Veronika Kudermetova to advance to the final on a walkover.
Osaka, who last played competitively when she lost to Leylah Fernandez in the third round of the US Open in September, displayed plenty of her trademark power but often lacked accuracy at the Australian Open warm-up event.
Osaka, who turned 24 on Saturday, posted several pictures of her on social media.
Osaka, 23, slipped from seventh to 12th position, ending her streak of 140 consecutive weeks in the top 10.
The Canadian teen had earlier stunned third seed and defending champion Naomi Osaka.
The Two-time champion's title defence ended in tears, as she suffered a stunning defeat in the third round to Canadian Leylah Fernandez.
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