Tony DeMarco is an American former boxer and World Welterweight Champion. Born to Sicilian immigrants, Vincent and Giacomina, DeMarco grew up in the North End neighborhood of Boston.

Due to the minimum age of eighteen, in order to box professionally, Liotta used the birth certificate of Tony DeMarco so that he could compete. DeMarco had his first professional fight when he was sixteen years old. On October 21, 1948, he knocked out Mestor Jones in one round.