Ronny Rios faces tall order in champion Rey Vargas

He is listed at 5-foot-9 in some places, 5-foot-7 ½ in others, but somehow makes the 122-pound super bantamweight limit. He also is known as the next man to take the baton at Nacho Beristain's Gym Romanza in Mexico City, a place where 27 world champions have learned the boxing game.