Willie Mosconi: Played professional Billiards at age 6
William Joseph Mosconi, nicknamed Mr. Pocket Billiards was an American professional pocket billiards (pool) player from Philadelphia, Pennsylvania. Willie's father owned a pool hall where he wasn't allowed to play, but Willie improvised by practicing with small potatoes from his mother's kitchen and an old broomstick. His father soon realized that his son was a child prodigy and began advertising challenge matches, and though Willie had to stand on a box in order to reach the table, he beat experienced players many years his senior.
Between the years of 1941 and 1957, he won the BCA World Championship of pool an unmatched fifteen times. Mosconi pioneered and employed numerous trick shots, set many records, and helped to popularize the game of billiards. He still holds the officially recognized straight pool high run record of 526 consecutive balls.