Unbeaten is one of the best sports books I’ve read in years' Jonathan Eig, author of Ali: A Life Rocky Marciano accomplished a feat that eluded legendary champions like Joe Louis, Jack Dempsey, Muhammad Ali, and Mike Tyson: he never lost a professional fight. When he retired in 1956, his record was a perfect 49-0. Unbeaten is the revelatory biography of one of the greatest heavyweights of all time. Marciano rose from abject poverty and a life of petty crime to become heavyweight champion and one of the most famous faces of his era. He dominated boxing in the decade following the Second World War with a devastating punch, which he nicknamed the ‘Suzie Q’. But perfection came at a price.