Coco Gauff is now on a cereal box and has her own shoe line despite series of losses since US Open title

Coco Gauff became America's next women's tennis star last year, but she hasn't played like it lately. That hasn't stopped her from becoming a merchandising fireball. 

On Tuesday, it was announced Gauff would be the next athlete to appear on boxes of Wheaties, and she also has her first signature shoe, the Coco CG2. 

Gauff, who won the U.S. Open last year at just 19 years old and became the first American teenager to win the U.S. Open since Serena Williams in 1999, will attempt to defend her title Aug.