My knowledge of the 108 and below divisions is abysmal. Mayol likes to headbutt people a lot. He's wild. That's all I know based on the Calderon fight, seems a strong aggressive type. Romero has hardly any knockouts which makes me think he might have a hard time with Mayol. Never seen him though. Least he's at home...if he's a 'boxer' maybe they'll appreciate it at home. ...I'll go Mayol.
Not seen any of Romero but he has a win over Viloria. I seen Mayol 3 times and all three fights have basically ended with head clashes. He seemed to be doing good against Calderon on both occasions very wild fighter that brings good pressure. The Sosa fight really should have been called off he never recovered from the butt in that fight either. Going by both fighters records this is going to be messy but i don't think Romero has the power to keep Mayol off him and finishing him.