Officers arrived to Aldo's Night club on Belmont Avenue just before 1 am.
That's where they found a man suffering from stab wounds to the face and arm.
Police say the victim and suspect got in a fight in the parking lot -- when the suspect pulled out a sharp object and stabbed him with it.
Detectives are investigating what led up to the fight -- but they say early evidence shows that the victim may have actually started the confrontation.
Officers haven't announced any arrests.