In 1956, Moore fought mostly as a heavyweight but did retain his Light Heavyweight title with a ten-round knockout over Yolande Pompey in London. He won 11 bouts in a row before challenging again for the World Heavyweight Championship. The title was left vacant by Marciano, but Moore lost to Floyd Patterson by a knockout in five (Patterson, yet another future Hall of Famer, himself made history that night, becoming, at the age of 21, the youngest World Heavyweight Champion yet, a record he would hold until 1986).