22-year-old tennis superstar Naomi Osaka is officially the highest-paid female athlete in history. According to Forbes, the Japanese-Haitian athlete earned a total of $37.4 million USD from prize money and endorsements between June 2019 and May 2020. Osaka is currently backed by 15 endorsement partners ranging from Nissan Motor, Shiseido and Yonex, with almost all of them worth seven […]