Liev Schreiber

Chuck Wepner

Naomi Watts

Linda Wepner

Elisabeth Moss

Phyllis Wepner

Ron Perlman

Al Braverman

Jim Gaffigan

John Stoehr

Michael Rapaport

John Wepner

Pooch Hall

Muhammad Ali

Morgan Spector

Sylvester Stallone

Jason Jones

Arty

William Hill

Paddy

Wass Stevens

Johnny Dicesare

Kelvin Hale

Charlie Polite

Megan Sikora

Flo Wepner

Georgia X. Lifsher

Rachel

Catherine Corcoran

Sandy

Sadie Sink

Kimberly

Melo Ludwig

Young Kimberly (aged 6)

Georgi Georgiev

Mouthy

Leslie Lyles

Charlotte

Velizar Binev

Referee

Robert C. Kirk

Warden

J.J. Kandel

Jimmy the Cop

Jen Ponton

Stallone's PA

Rick Zahn

Police Captain

Ivan Martin

Bobby Vann

Jonathan Wilde

Dave

Zina Wilde

Teacher

Mark Borkowski

Joe

Anthony J. Gallo

Maitre'D

Shade Rupe

16mm Cameraman (uncredited)

Leonard Zimmerman

Hotel Valet (uncredited)

Paul Mecurio

Goomba Partier