Ryan Destiny as Claressa 'T-Rex' Shields

Brian Tyree Henry as Jason Crutchfield

Oluniké Adeliyi as Jackie Shields

Kylee D. Allen as Young Claressa (Running)

Emmanuel Igboke as USA Team Officer

Lanette Ware as Coach Parker

Amanda Barker as Female Clerk

De'Adre Aziza as Mickey

Adam Clark as Clarence

Jessica Grossi as Team USA Teammate

Michael Brown as Donte Green

Tyrone Benskin as AJ

Cynthia Zhou as Shanghai Announcer

Jazmin Headley as Young Claressa

Chrystian Buddington as Corey

Maurice Wayne Anglin as Young Corey

Teanna Weir as Keisha

Idrissa Sanogo as Lil' Zay

Taytem Douglas as Young Lil' Zay

Shechinah Mpumlwana as Briana

Nendia Lewars as Young Briana

Sekhai Smith as Peanut

Chidubem Rafael Echendu as Young Peanut

Sarah Allen as Nicole Thompson

Jason Weinberg as Bob Coleman

Richard Lewis as Bean

Chiamaka Glory as Jackie's Lady Friend

Bobby Daniels as Jackie's Guy Friend Alfred

Tiandria Taylor as Deedra

Marium Carvell as Lunch Lady

Jamillah Ross as Seamstress

Ivan D. Ossa as Student

Kenya Salmon as Student

John Kalbhenn as Detroit Regional Referee

Dorian Jeremy Prenel Ouaton as Berston Boxer

Patrick Dussault as Shanghai - WBWC Announcer

Charlene Wong as Shanghai - WBWC Ref (Marshall Claressa Fight)

Tabitha Tao as Shanghai - WBWC Chinese Tournament Sponso

Jennifer Huggins as London - Olympic Referee (Gold Medal Match)

Zak Farion as London - Olympic Admin

Ruth Tinker as London - Olympic Broadcast Announcer

Matthew Gorman as London - Olympic Broadcast Announcer

Matt Standish as London - Olympic Referee (Laurell Fight)

Laura Vincent as London Journalist

Donovan Boucher as London - Olympic Referee (Volnova Fight)

Neil Crone as Spokane MC

Mark Simmons as Spokane Referee

Myrthin Stagg as Spokane Reporter

James Finlay Fraser as London - Olympic Arena Announcer

Natasha Spence as Kira Fitzgerald

Jordan A.K. Browm as Marching Band Member

Allen Adepoju as Marching Band Member

Jasmine Jones-Ball as Marching Band Member

Daniel Jordan Anthony as Marching Band Member

Nicole Drury as Savannah Marshall

Christine Cleary as Anna Laurell (Quarterfinal)

Laura Vuculescu as Marina Volnova (Semifinal)

Melissa Karagianis as Torlopova aka 'The Jackal'

Amara-Grace Boyce as Fat Daddy Baby

Za'Niyah-Rose Kirston-Reeves as Fat Daddy Baby

Selina An as Boxing Spectator (uncredited)

Jim Carey as American Boxing Fan (uncredited)

J. Timothy Hunt as Marlen's Manager (uncredited)

Jack Nguyen as Shanghai Spectator (uncredited)

Shubei Zheng as Boxing Spectator (uncredited)