Philippe Falardeau Director Liev Schreiber Chuck Wepner Actor, Screenwriter, Producer Elisabeth Moss Phyliss Actor Naomi Watts Linda Actor Ron Perlman Al Braverman Actor Jim Gaffigan John Actor Morgan Spector Stallone Actor Pooch Hall Muhammed Ali Actor Wass Stevens Johnny Dicesare Actor Melo Ludwig Young Kimberly Actor Sadie Sink Kimberly Age 11 Actor Michael Rapaport John Actor Jen Ponton P.A. Actor Catherine Corcoran Sandy Actor Ivan Martin Bobby Van Actor Wiliam Hill Paddy Flood Actor Jeff Feuerzeig Screenwriter, Executive Producer Jerry Stahl Screenwriter Michael Cristofer Screenwriter Michael Tollin Producer Carl Hampe Producer Christa Campbell Producer Lati Grobman Producer Avi Lerner Executive Producer Trevor Short Executive Producer Jeff Rice Executive Producer Mark Gill Executive Producer Nicolas Bolduc Cinematographer Richard Comeau Film Editing Corey A. Jackson Original Music Inbal Weinberg Production Design Gonzalo Cordoba Art Director Kendall Anderson Set Decoration Victoria Farrell Costume Design Billy Hopkins Casting Ashley Ingram Casting