Walker Smith was the real name of which world middleweight boxing champion?

Sugar Ray Robinson (born Walker Smith Jr.; May 3, 1921 – April 12, 1989) was an American professional boxer. Frequently cited as the greatest boxer of all time, Robinson's performances in the welterweight and middleweight divisions prompted sportswriters to create "pound for pound" rankings, where they compared fighters regardless of weight. He was inducted into the International Boxing Hall of Fame in 1990.

He received his name when he circumvented the AAU's age restriction by borrowing a birth certificate from his friend Ray Robinson. Subsequently told that he was "sweet as sugar" by a lady in the audience at a fight in Watertown, New York, Smith Jr. became known as "Sugar" Ray Robinson