Boxer Adrian Broner wanted for armed robbery in Cincinnati...
Multiple sources connected to the case tell us the incident in question went down around 3:30 AM on January 21st -- after Broner and another man had been making high stakes bets with each other at the lanes.
The alleged victim told police ... Broner had lost thousands of dollars in bowling bets and was pissed when the alleged victim decided to call it a night and go home with his winnings.
Our sources say ... the man claims Broner waited for him outside of the alley and punched him in the face and neck -- nearly knocking the man out cold.
According to court docs ... Broner "then retrieved a handgun from his vehicle, approached the victim, demanded money, then struck [the victim] in the face with a closed fist a second time, this time causing the victim to be rendered unconscious."
"Broner was then observed taking money out of the victim's pockets while he was unconscious before fleeing the scene." Officials note that Broner is a pro boxer -- and "professionally trained on how to cause serious physical harm to another person."
We're told the alleged victim was hospitalized -- and needed stitches to close a gash on his chin.