In Boston’s Armory, on 31 August of that same year, he fought the man known as the "Boxing Marvel," Jack Britton, for the Welterweight title. Lewis won in a twelve-round decision, becoming World Welterweight Champion and beginning an historic rivalry. Lewis became the first English boxer to cross the Atlantic and beat an American for a world title. This victory made him one of the youngest world champions in history at the age of 21 or 22 depending on the source.