Coco Gauff stuns defending champion Naomi Osaka to reach Australian Open fourth round

American teenager Coco Gauff stunned defending champion Naomi Osaka with a 6-3 6-4 victory to reach the fourth round of the Australian Open.

Coco Gauff of the US celebrates after victory against Japan's Naomi Osaka. Source: AFP

The 15-year-old American needed just 67 minutes to beat the No. 3 seed and set up a meeting with either China's Zhang Shaui or compatriot Sofia Kenin.

Gauff was totally dominant for large periods of the match and perhaps even surprised herself with the ease of her victory.