For only being 21 years old, Naomi Osaka has already had a better career than a lot of players. Her two Grand Slam titles and current world No. 1 ranking have made her into a global phenom. All eyes are on the Japanese player during this year's US Open, as she will have to win the tournament to keep her No. 1 ranking. So far, she's done just that to reach the third round.

Osaka's experience in Grand Slam main draws has been short, but it's important to look back at her humble beginnings. See how much you  know about her history at the Grand Slams.