When Billie Beat Bobby (2001)

As a kid, Billie was a tomboy who liked playing football with the boys. Her parents objected to contact sports and Billie chose tennis. She decided to become the best woman tennis player in the world. Billie starts fighting for equal prize money for men and women. When 55 y.o. male chauvinist Bobby Riggs in 1972 challenges feminist Billie Jean King to a tennis match, she rejects him. But when he defeats another top woman tennis player, Billie has to play against him in the match of the century.