Prince Sports signed a "lifetime endorsement" deal with tennis star Maria Sharapova. The contract follows the five-year deal that Sharapova signed with Prince when she was 14. She will continue to serve as a brand rep through various marketing efforts. including advertising, signature product lines, junior tennis programs, global grassroots outreach and "grow-the-game initiatives." Terms of the deal were not revealed, but were reported to be $25 million over the next 10 years, according to the Associated Press. The deal would make Sharapova the world's top-paid female athlete in terms of endorsement, with an estimated $20 million to $25 million per year.