Title-holder Naomi Osaka was stunned by 15-year-old Salm debutant and American Coco Gauff. Gauff is having a dream run in the tournament after beating the mighty Venus Williams in the first round, she now has beaten World No 3 Naomi Osaka in straight sets 6-3, 6-4.

Australian Open shocker: Defending champion Naomi Osaka knocked out by Coco Gauff

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Australian Open shocker: Defending champion Naomi Osaka knocked out by Coco Gauff