I watched some youtube footage of him at his absolute peak in 1981. He beat Joey Olivo by corner retirement after 13 rounds. Olivo was a very good fighter but he was totally outclassed. Then, Zapata won a 15 round UD over German Torres. Torres barely landed a punch. Zapata at his peak was an awesome combination of offense and slick defense. Too bad is prime wasn't too long. He was also freakishly tall for a Junior Flyweight/Flyweight and had a tremendous reach advantage over his opponents. I guess a weak chin was his primary drawback, but at his peak it wasn't tested much at all.