Naomi Osaka earned $60 million over the past 12 months, $23 million more than last year, as she maintained her place as the top-earning female athlete ever, Forbes said Wednesday.

The U.S. magazine, which releases a list of the top-earning celebrities every year, also said the Japanese tennis star is ranked 12th among the world's 50 highest-paid athletes, up from No. 29 last year, in the newest ranking to be published on Friday.

Forbes says the 23-year-old, who recently withdrew from the French Open citing her struggles with depression, has over 20 sponsorship deals and $55 million of the $60 million she made in the 12-month period came from endorsement deals.