Moicano, 36, overcame his teammate and training partner at American Top Team to earn a victory with a face crank. The win snapped a two-fight skid for the Brazilian lightweight.
Duncan, 32, had been on a five-fight winning streak before the loss.
Renato Moicano defeated teammate Chris Duncan via second-round submission at UFC Fight Night in Las Vegas, ending his two-fight losing streak.
Moicano, 36, overcame his teammate and training partner at American Top Team to earn a victory with a face crank. The win snapped a two-fight skid for the Brazilian lightweight.
Duncan, 32, had been on a five-fight winning streak before the loss.