![Australian Open: 15-Year-Old Coco Gauff Knocks Out Defending Champion Naomi Osaka [Video] 1](https://media.kanyidaily.com/2020/01/24115900/screenshot2020-01-24-11_58_22.jpg "Australian Open: 15-Year-Old Coco Gauff Knocks Out Defending Champion Naomi Osaka [Video] 1")
American teenager, Coco Gauff has knocked out the defending champion, Naomi Osaka, in straight sets to reach the fourth round of the Australian Open. The 15-year-old...
Naomi Osaka is the new world number one after beating Czech Petra Kvitova 7-6 (2) 5-7 6-4 in a dramatic final to win the Australian Open....