NCIS: Los Angeles co-star Eric Christian Olsen has joined the cast of Fox Searchlight’s upcoming sports biopic Battle of the Sexes. Directed by Little Miss Sunshine duo Jonathan Dayton & Valerie Faris, the film tells the story behind famous 1973 “Battle of the Sexes” tennis match between 29-year old No. 2 ranked female star Billie Jean King and former champion Bobby Riggs that stemmed from Riggs denigration of the female sport as inferior to the male version.