|Carl Brisson||'One-Round' Jack Sander|
|Ian Hunter||Bob Corby|
|Forrester Harvey||James Ware|
|Gordon Harker||Jack's Trainer|
|Billy Wells||Boxer (uncredited)|
|Charles Farrell||Second (uncredited)|
|Clare Greet||Fortune Teller (uncredited)|
Jack is a carnival-employed boxer; patrons pay cash to take him on in the ring, and he earns the nickname ''One-Round'' by giving them their money's worth with a quick knockout. His many victories have given him a big head and a bigger mouth, so when heavyweight champion Bob shows up in town, he decides to shut Jack up by challenging him to a match. As the fight nears, Jack's fiancée develops eyes for Bob, giving the bout a bitter edge.