Naomi Osaka

At just 22 years old, 2018 US Open champion Naomi Osaka is the highest-paid female athlete of all time, according to an annual list published by Forbes. Osaka earned $37.4 million over the past 12 months from prize money and endorsements, surpassing Serena Williams ($36 million), who had topped the list for each of the past four years. Osaka’s earnings also set an all-time single-year record, overtaking Maria Sharapova’s record of $29.7 million set in 2015. It marks the 10th consecutive year that a tennis player has held the top spot in the female highest-earning ranks.