Rocky Marciano started fighting as a professional boxer in 1948, winning a fight against Harry Bilizarian. He then went on to win his first 16 fights. In 1952, he beat Jersey Joe Walcott for the world heavyweight championship.

How old was Marciano when he started boxing?

The hard-hitting Rocky Marciano retired with an impressive undefeated record of 49-0, with 43 knockout victories, in 1955. “The Brockton Blockbuster” didn't start boxing until he was 23, which is incredible considering the success he achieved throughout his devastating career.

When was Rocky Marciano first fight?

First interested in a professional baseball career, Marciano began to box while in the U.S. Army during World War II. He had his first professional fight on March 17, 1947.