Billie Jean King is one of the greatest tennis players of all time, and an outspoken advocate off the court for the LGBTQ community and women’s rights. The new film, Battle Of The Sexes, stars Emma Stone as Billie Jean King, and follows the tennis icon’s infamous 1973 match against Bobby Riggs. In the video above, the movie’s screenwriter Simon Beaufoy explains why now is the perfect time to tell King’s story.