Answer
Damon Runyon, a renowned sportswriter, bestowed the moniker "Cinderella Man" upon James J. Braddock, a former boxer who made an improbable comeback to win the world heavyweight championship in 1935. Braddock's triumph, rising from obscurity to achieve greatness, resonated with the public during the Great Depression, evoking the classic fairytale of Cinderella's transformation.