 He averaged 17.3 points and 15.1 rebounds per game over his collegiate career, and pulled down 30 rebounds in a 1966 game against Syracuse University.Leaks was selected by the Detroit Pistons with the 20th pick of the 1968 NBA draft, but he began his professional career in the American Basketball Association, where he played four seasons as a member of the Kentucky Colonels, New York Nets, Dallas Chaparrals, Texas Chaparrals, Utah Stars, and Floridians.He averaged 13.5 points and 9.9 rebounds per game during his stint in the ABA, which ended in 1972 in the wake of salary disputes with the Floridians.