Guillermo Rigondeaux KO1 Dannis Aguero Arias... It wasn't much of a fight, but former world 122-pound champion Guillermo Rigondeaux, now 44 years old, got his first win in almost a year and a half, a first-round KO over Dannis Aguero Arias of the Dominican Republic. The bout took place in Miami. Arias has a good record (20-3), but in the first round, he took a ten count from a well-placed but soft-looking body shot.