Key events that contributed to the career of Billie Jean King include her victory in the 1966 inaugural Women's Tennis Association tournament, where she was pivotal in advocating for women's equality in sports. She also played a significant role in the Battle of the Sexes match against Bobby Riggs in 1973, which not only showcased her talent but also symbolized gender equality. King's establishment of the Women's Sports Foundation further solidified her legacy as an advocate for women in sports, amplifying her influence beyond the tennis court.