Cocu Gauff 15, defeats defending Champion Naomi Osaka 22, at the Australian Open

15-year-old Cocu Gauff has stunned defending champion Naomi Osaka, 22, at the Australian Open.

Cocu defeated Osaka by 6-3 6-4 in straights sets at The Rod Laver Arena on Friday to book her place in the fourth round in Melbourne.

"Two years ago, I lost in the first round at juniors and now I'm here!. What is my life? Oh my gosh, Two years ago I lost first round in juniors, and now I'm here. This is crazy,' said Gauff, who is still doing schoolwork online.

"I was just telling myself one point at a time and keep fighting because you never know what happens on this court. I'm on Rod Laver Arena, I can't believe this", She said after the game.

After defeating Venus Williams and Osaka, Cocu will now face either American Sofia Kenin or Shuai Zhang of China in the next round.