Coco Gauff, 15, knocks out Australian Open defending champ Naomi Osaka - Sportstar
2:16am PST - January 24th, 2020 coco gauff - The HinduCoco Gauff, 15, knocks out Australian Open defending champ Naomi Osaka Sportstar Australian Open: 15-year-old Coco Gauff stuns title-holder Naomi Osaka 6-3, 6-4 Hindustan Times Teenager startles the tennis world with win over defending champ Sydney Morning He…