Marvin Hagler Hector Camacho Robbie Sims Adolfo Viruet Leoncio Ortiz Duran performed impressively against his early southpaw opponents who were admittedly not higher class opponents. He did well above his best weight against half-brothers Hagler and Sims. Many felt he beat Hector Camacho way past his prime. I don't think he had any particular problems facing the southpaw style.