Coco Gauff put in a supreme display to beat defending champion Naomi Osaka in the third round of the Australian Open. Four months after losing 6-3 6-0 to Osaka at the US Open, 15-year-old Gauff once more proved why she is a star in the making with a terrific 6-3 6-4 victory in her first outing on Rod Laver Arena. Gauff, playing in her maiden Australian Open, faces either 14th seed Sofia Kenin or Shuai Zhang in the fourth round. Back in September, Gauff was left in tears after picking up just three games in her US Open third-round meeting with Osaka, who consoled the American during an incredible display of sportsmanship. This time around, Gauff could hardly believe her own achievement, putting her arms out in disbelief before letting the moment sink in. "Oh my gosh, I don't even know [where that performance came from]. From the crowd I guess," Gauff said on court afterwards. " Honestly. What is my life? Oh my gosh. Two years ago I lost the first round in juniors. Now I'm here. It's crazy." "I love it down here. Thank you guys from the bottom of my heart. Oh my gosh I'm on Rod Laver Arena I can't believe this!