Liev Schreiber character Chuck Wepner
Naomi Watts character Linda Wepner
Elisabeth Moss character Phyllis Wepner
Ron Perlman character Al Braverman
Jim Gaffigan character John Stoehr
Michael Rapaport character John Wepner
Pooch Hall character Muhammad Ali
Morgan Spector character Sylvester Stallone
Jason Jones character Arty
William Hill character Paddy
Wass Stevens character Johnny Dicesare
Kelvin Hale character Charlie Polite
Megan Sikora character Flo Wepner
Emil Tonev character Fight Ref
Georgia X. Lifsher character Rachel
Catherine Corcoran character Sandy
Sadie Sink character Kimberly
Melo Ludwig character Young Kimberly (aged 6)
Georgi Georgiev character Mouthy
Mihail Nedyalkov character Nerk
Liv Rooth character Platinum Blonde
Joe Starr character Manny
Leslie Lyles character Charlotte
Velizar Binev character Referee
Robert C. Kirk character Warden
J.J. Kandel character Jimmy the Cop
Jen Ponton character Stallone's PA
Rick Zahn character Police Captain
Ivan Martin character Bobby Vann
Jonathan Wilde character Dave
Zina Wilde character Teacher
Charlie Meany character Sports Interviewer
Mark Borkowski character Joe
Lucinda Rogers character Lil
Anthony J. Gallo character Maitre'D
