From teen phenom to business powerhouse: Six years after her legendary Wimbledon upset, Coco Gauff has amassed two Grand Slam titles and nearly $30 million in career prize money.But her game is just getting started. At 21, she's the highest-paid female athlete globally, leveraging her estimated $25 million in annual off-court earnings into smart ventures—including an investment in the women’s basketball league Unrivaled.Read more: https://t.co/O0TYEOX7VN #ForbesUnder30 (Photo: Guerin Blask for Forbes) ...