Alfonso Zamora Quiroz is a Mexican former professional boxer who competed from 1973 to 1980. He was the Lineal and WBA bantamweight champion, and made five title defenses. As an amateur, he won a silver medal in the bantamweight event at the 1972 Munich Olympics.

A knockout is a fight-ending, winning criterion in several full-contact combat sports, such as boxing, kickboxing, muay thai, mixed martial arts, karate, some forms of taekwondo and other sports involving striking, as well as fighting-based video games. A full knockout is considered any legal strike or combination thereof that renders an opponent unable to continue fighting.