American professional boxer, world welterweight and middleweight champion.

After serving in the Marine Corps, Basilio became a professional boxer in 1948. Only in the sixth year of his professional career did he finally receive an opportunity to fight for a world championship. He lost that welterweight title match on September 18, 1953, to Kid Galivan (Kid Gavilan) by a 15-round decision, but he received a second title opportunity on June 10, 1955, in which he knocked out Tony DeMarco in the 12th round to win the welterweight championship. He engaged in a November 30, 1955, rematch with DeMarco and again won on a 12th-round knockout.

In 1956 Basilio boxed two championship matches against Johnny Saxton, losing his title on a 15-round decision on March 14 and regaining it on a 9th-round knockout on September 12. The two fought again on February 22, 1957, with Basilio winning on a 2nd-round knockout. Basilio moved up to the middleweight class and won the championship on September 23, 1957, by defeating Sugar Ray Robinson (Robinson, Sugar Ray) by a 15-round decision. In 1959 and 1960 Basilio was pitted against Gene Fullmer for the National Boxing Association version of the middleweight title and was knocked out both times. He fought for the world middleweight title on April 22, 1961, and lost a 15-round decision to Paul Pender. Three days later Basilio announced his retirement. His career record was 56 wins (27 by knockout) and 16 losses; Basilio was inducted into Ring magazine's Boxing Hall of Fame in 1969.