 Hugh JackmanCharlie Kenton | Charlie Kenton |
 Dakota GoyoMax Kenton | Max Kenton |
 Evangeline LillyBailey Tallet | Bailey Tallet |
 Kevin DurandRicky | Ricky |
 Anthony MackieFinn | Finn |
 Hope DavisAunt Debra | Aunt Debra |
 James RebhornMarvin | Marvin |
 Karl YuneTak Mashido | Tak Mashido |
 Sophie LevyBig Sister | Big Sister |
 Tess LevyLittle Sister | Little Sister |
 Olga FondaFarra Lemkova | Farra Lemkova |
 John GatinsKingpin | Kingpin |
 Gregory SimsBill Panner | Bill Panner |
 Torey AdkinsLarge Texan Man | Large Texan Man |
 Phil LaMarrESPN Boxing Commentator | ESPN Boxing Commentator |
 John HawkinsonSan Leandro Gentleman #2 | San Leandro Gentleman #2 |
 David Alan BascheESPN Boxing Commentator | ESPN Boxing Commentator |
 Julian GantStarblaze Arena Reporter | Starblaze Arena Reporter |
| KKen AlterVirgin America Spectrum Ring Announcer | Virgin America Spectrum Ring Announcer |
| LLeilani BarrettVirgin America Spectrum Ref | Virgin America Spectrum Ref |
| DD.B. DickersonTwin Cities Controller | Twin Cities Controller |
 Peter CareyBing Arena Announcer | Bing Arena Announcer |
 Dan LemieuxBing Arena Ref | Bing Arena Ref |
| RRichard GoteriOlder Gentleman | Older Gentleman |
| TTim HolmesBlacktop Controller | Blacktop Controller |
 Ricky WayneUnderground Promoter | Underground Promoter |
 Taris TylerRobot Promoter | Robot Promoter |
 Kevin DormanAtom Performance Capture | Atom Performance Capture |
 John ManfrediSergei Lemkova | Sergei Lemkova |
 Mike AncrileFight Fan (uncredited) | Fight Fan (uncredited) |
