Four people were hospitalized with slash wounds early Saturday following a bloody brawl outside an Upper Manhattan nightclub, police said. Two groups fought outside the Opus Lounge on W. 202nd St. near 10th Ave. in Inwood at about 4:15 a.m., cops said. When police arrived, they found a 31-year-old man suffering from deep slash wounds to the face. He was rushed to Harlem Hospital, where he was treated. A short time later, three women showed up at Columbia University’s Irving Medical Center, claiming that they had been involved in the fight at the club. One woman, 26, had been slashed in the back of the neck, ear, and her left hand, cops said. The two other women, both 24, suffered deep cuts to their hands as they tried to defend themselves. Cops took a man into custody at the scene. Criminal charges were pending. It wasn’t immediately disclosed how the fight began. The Opus Lounge advertises itself on social media as “Uptown’s Best Friday Party” and usually kicks off the weekend with DJ nights. A call to the Lounge Saturday was not immediately returned.