NBA player Chris Copeland's got beef with 1 OAK Nightclub in NYC for allowing one of its customers to stab him and his GF ... so he's going after them in court.
According to the lawsuit, obtained by TMZ Sports, Copeland and his girlfriend got into an argument with two other people leaving the club a year ago. He says the altercation escalated quickly, and one of the strangers stabbed him and Katrina Saltara, his girlfriend. He says they suffered serious injuries.
Copeland says 1 OAK negligently allowed the stabber into the club with a "spring-operated switchblade knife" and did nothing to prevent the stabbing.