Serena Williams crashed out, 15-year-old Coco Gauff stunned Naomi Osaka and Roger Federer survived a five-set thriller as the form book went flying out of the window at the Australian Open on Friday.
Men's title-holder Novak Djokovic eased into the last 16 but elsewhere there were surprises all over Melbourne Park with Williams the biggest victim and Federer fighting back from 4-8 down in a fifth-set tie-break with John Millman.
Williams' bid for a record-equalling 24th Grand Slam was shattered by the unlikely figure of China's Wang Qiang, who triumphed in three tough sets -- after winning just one game when they played at the US Open in September.
Gauff then stepped up her giant-killing Melbourne debut as she ousted Japanese defending champion Osaka, 22, in dismissive style, winning 6-3, 6-4 in just 67 minutes to reach round four.
"Oh my gosh. Two years ago I lost first round in the juniors and now I'm here -- this is crazy," said the teenager, who shocked Venus Williams in the first round.
Federer came within a whisker of repeating his 2018 US Open upset by Millman as he was taken to five punishing sets by the tough Australian.
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The 20-time Grand Slam champion was facing defeat in the super tie-breaker but he clawed back from 4-8 down to clinch his 100th win at the Australian Open.
"Oh God, it was tough," said Federer. "Thank God it was a super tie-breaker (10 points), otherwise I would have lost this one.
"It came down to the wire in the end."
- 'I made it happen' -
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"People thought that I was crazy being from a small country. But I made it happen." - Rattled Osaka -
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