Emma Stone was initially cast as Billie Jean King, but scheduling issues forced her to pass on the role. Brie Larson was ultimately tapped to replace Stone. After a few months, Larson dropped out. After Stone's schedule was cleared, she was able to take back the role.
First time Danny Boyle has produced but not directed a film since 28 Weeks Later (2007). Danny was originally set to direct this but had to leave due to sheduling conflicts with Steve Jobs (2015) and a T2 Trainspotting (2017).