Billie Jean King is Sports Illustrated's 2021 Muhammad Ali Legacy Award winner not just for leading the charge for gender equality during her decorated tennis career, but for how she's kept it up in the 40 years since. King reflects on how her and Ali's paths intersected as sports activists, the challenges she had to overcome, and how she's continued to fight for women and other causes such as environmentalism and LGBTQ rights. #SIAwards #Sportsperson --------------------------------------------------------------------------------------------------------------------------- Follow SI on all social channels! Twitter: https://buff.ly/2Pf9t9e Facebook: https://buff.ly/3l3ziFu Instagram: https://buff.ly/3oZia6i TikTok: https://buff.ly/3wGhuFc Subscribe to SI today for access to the biggest teams, the boldest names, and the legendary stories that only we can deliver: https://buff.ly/34iPNWS