Sidney Walker, better known as Beau Jack, (April 1, 1921 – February 9, 2000), was an American lightweight boxer, he was a world champion twice. One of the most popular fighters during the war years, he headlined at Madison Square Garden on 21 occasions, a record that still stands.

He was born in Augusta, Georgia and was raised by his maternal grandmother, who gave him the nickname "Beau Jack", following the death of his mother. From an early age Jack worked as a shoe-shine boy in Augusta, when he was 15 he looked to supplement his income by participating in the brutal battles royal. These fights featured six black men fighting blindfolded until one remained, these fights were funded by rich white men for their own entertainment, the winner received a relatively meagre purse. Despite his small stature Jack was often victorious.

Following his first battle royal at the Augusta National Golf Club Jack became a caddie at the club. He quickly befriended some of the club's members, including the golfing legend Bobby Jones, who helped fund his boxing training.
Source : Wikipedia