American tennis phenom Coco Gauff stopped by TODAY yesterday morning following her history-making win at the U.S. Open where the 19-year-old nabbed her first Grand Slam title Sunday. “It felt like it hit all at once,” she says of the moment on the court when the realization of her win sank in. She was also joined by her lovely parents that supported her since day one! Plus there is a viral video of Coco as a youngster in the bleachers cheering on her favorite tennis star back in the day! See the video clip inside….