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.
In 1973, Billie Jean King was 29 and Bobby Riggs was 55. At the time of filming Emma Stone was 28 and Steve Carell was 54.
Jonathan Dayton and Valerie Faris previously directed Steve Carell in Little Miss Sunshine (2006).
This is the second time Emma Stone and Steve Carrell have worked together since Crazy, Stupid, Love. (2011).
This will be the first time Emma Stone and Andrea Riseborough have worked together since Birdman or (The Unexpected Virtue of Ignorance) (2014).