Teen Coco Gauff Stuns Defending Champ Naomi Osaka; Serena Williams Beaten in Third Round of Australian Open Embed from Getty Images (January 24, 2020) Friday saw the biggest day of upsets at the Australian Open in Melbourne Park. Defending champion and third Naomi Osaka lost to 15-year-old Coco Gauff 6-3, 6-4 in third round. Back in the fall, Osaka gave up only three games … [Read more...] about Teen Coco Gauff Stuns Defending Champ Naomi Osaka; Serena Williams Beaten in Third Round of Australian Open