Coco Gauff began competing in International Tennis Federation (ITF) junior tournaments at the age of 10. She quickly made a name for herself, demonstrating exceptional talent and competitive spirit.

At the age of 13, Gauff reached the final of the US Open girls' singles tournament, becoming the youngest finalist in the tournament's history. Although she lost the final, this achievement signaled her potential as a future star.

Coco Gauff won the French Open girls' singles title, solidifying her status as one of the top junior players in the world. This victory was a significant milestone in her development and boosted her confidence.

By the end of 2018, Coco Gauff had reached the No. 1 ranking in the ITF junior world rankings, showcasing her dominance and consistent performance in junior tournaments.