"Nick Wild (Jason Statham) is a Las Vegas bodyguard with lethal professional skills and a personal gambling problem. When a friend is beaten by a sadistic thug, Nick strikes back, only to find out the thug is the son of a powerful mob boss. Suddenly Nick is plunged into the criminal underworld, chased by enforcers and wanted by the mob. Having raised the stakes, Nick has one last play to change his fortunes...and this time, it's all or nothing"
Rourke sent Seymour to the canvas twice in the second round before the referee stopped the fight.
The organisers of the match said the boxers were receiving "large amounts of money" in fees but declined to give details.
"I'm very happy to be back to the boxing ring. Thank God for letting me do this", Rourke said ahead of his fight with 29-year-old Seymour.
Seymour is ranked 256th in the United States and before the fight with Rourke had one knockout and nine losses in 10 bouts.
Rourke returned to boxing as a professional in the 1990s and was undefeated in eight fights, with six wins and two draws."