According to ‘Forbes,’ Naomi Osaka earned a total of $24.3 million over the last year.Osaka was only out-earned by fellow tennis veteran Serena Williams, who pulled in $29.2 million, .making her the world’s highest-paid female athletes for the fourth year in a row. .An estimated $16 million of Osaka’s earnings came from endorsements with MasterCard, Nissan,Procter & Gamble and All Nippon Airways.