So how exactly did Osaka rise to become the world's highest-paid female athlete? Born in Japan, Osaka moved with her family to the United States when she was three years old, training in Florida before registering with the Japan Tennis Association at age ten (via Insider). After turning pro at 16, she quickly ascended the ranks, and was named Newcomer of the Year by the Women's Tennis Association when she was 18. From there, Osaka won two back-to-back Grand Slams in 2018 and 2019, beating Serena Williams at the US Open in a win that would cement her notoriety forever. 

With her earth-shaking victories and unique, confident personality, Osaka earns major money through endorsements. According to Forbes, Nike and Adidas fought in a bidding war to endorse Osaka, with Nike coming out on top by agreeing to pay her ten million dollars a year through 2025. Other deals with brands like Nissan Motor, Shiseido, and Yonnex are each worth one-million-plus annually. Rounding out her 15 endorsements are MasterCard and ramen noodle brand, Nissin Foods. 

Both Osaka's on- and off-court earnings combine to give her a total net worth of around $25 million (via Celebrity Net Worth), which will only continue to grow with her future wins and partnerships.