17-year-old tennis star Coco Gauff will not be competing in the Olympics this year – after testing positive for COVID. She released a statement on Twitter on Sunday with the news. "I am so disappointed to share the news that I have tested positive for COVID and won't be able to play in the Olympic Games in Tokyo," Gauff wrote. "It has always been a dream of mine to represent the USA at the Olympics, and I hope there will be many more chances for me to make this come true in the future. (NBC News)