The film is currently filming with helmer David Michôd ( War Machine, Hesher) having decided that Sweeney was the woman for the gig after watching her as a defendant in HBO’s Reality. He also co-wrote the script (with Mirrah Foulkes) and told Deadline about the framing of this biopic:

Some major talent has been added to the Sydney Sweeney-led Christy Martin movie, with Ben Foster and Merritt Wever among those joining.

Emmy winner Merritt Wever ("Nurse Jackie," "Unbelievable"), Katy O'Brian (“Love Lies Bleeding,” “Twisters”), Ethan Embry (“Sweet Home Alabama,” "Grace and Frankie"), Jess Gabor ("Shameless," "Three Women"),

Black Bear has unveiled a raft of cast additions to David Michôd's untitled Sydney Sweeney-led biopic about boxing champion Christy Martin, as filming starts. The film tells the true story of Martin,