Answer
The answer is Jersey Joe Walcott. Walcott was a formidable boxer who had successfully defended his title against top contenders. However, Marciano's relentless pressure and powerful punches proved to be too much for Walcott. In their 1952 bout, Marciano dominated the fight, landing heavy blows and eventually knocking Walcott out in the 13th round. This victory marked Marciano's rise to prominence as the new heavyweight champion.