Rocky Marciano, American boxer (b. 1923)
Rocco Francis Marchegiano (September 1, 1923 – August 31, 1969; Italian pronunciation: [markeˈdʒaːno]), better known as Rocky Marciano (, Italian: [marˈtʃaːno]), was an American professional boxer who competed from 1947 to 1955, and held the world heavyweight title from 1952 to 1956. He is the only heavyweight champion to have finished his career undefeated. His six title defenses were against Jersey Joe Walcott (from whom he had taken the title), Roland La Starza, Ezzard Charles (twice), Don Cockell and Archie Moore.

Known for his relentless fighting style, formidable punching power, stamina, and exceptionally durable chin, Marciano is considered one of the greatest heavyweight boxers of all time.Marciano remains the only fighter to have stopped every opponent he ever faced for the world heavyweight title, and holds the highest knockout-to-win ratio in world heavyweight title fights at 85.7%. His career knockout-to-win percentage of 87.8% remains one of the highest in heavyweight boxing history. Marciano is ranked #14 in The Ring magazine's list of the 100 greatest punchers of all time.