Tennis star Naomi Osaka had a massive year in 2020, becoming the highest earning sportswoman ever, and protesting police violence against black Americans in both her private and professional life. Born in Japan, she's spent most of her life in the US. This year she's set to light up the Tokyo Olympics as one of the stars of the games. What else lies ahead for Naomi Osaka? We hear from those closest to her including her coach and manager, and feature an exclusive interview with campaigner and tennis legend Billie Jean King.

Presenter: Mark Coles
Producer: Beth Sagar-Fenton
Editor: Rosamund Jones
Mix: Rod Farquhar