McWilliams Arroyo is the WBC’s new interim flyweight champion…

The 35-year-old Puerto Rican boxer dominated Mexico’s Abraham Rodriguez in less than five rounds to claim the title during Saturday’s Canelo Alvarez–Avni Yildirim co-main event at Hard Rock Stadium in Miami.

It became clear early on that Arroyo also had the realistic edge against Rodriguez, a late replacement who arrived in Miami on Friday.

By the fourth round, it showed.

Arroyo (21-4, 16 KOs) pummeled Rodriguez (27-3, 13 KOs) throughout the round, eventually forcing him to one knee and knocking him down. The onslaught continued in the fifth round, although Rodriguez held up well considering the lack of time to properly train. It led to Rodriguez’ corner waiving the white towel midway through the fifth round to stop the one-sided fight.

Arroyo was dominant throughout a fight that was supposed to be against Julio Cesar Martinez.

Martinez had to withdraw from the bout on Thursday with a small right hand fracture suffered during a sparring session. He had hoped to continue to train, but the injury got worse earlier this week.