A native of Oak Park, Illinois, Guy went to Oak Park and River Forest High School. He attended Fresno State University for the first two and a half years of college before transferring to the University of Texas–Pan American in the middle of his junior season. Guy, a 6 ft 1 in (1.85 m), 190 lb. point guard/shooting guard, led the Broncs in scoring in each of his seasons with the team. He also made an immediate impact as a transfer player by leading all of Division I in scoring with a 29.3 points per game average. Despite his explosive scoring ability, the Broncs finished the season with a 2–20 overall record. Guy, therefore, holds the distinction of being on the worst team in college basketball history to have the nation's leading scorer on its roster. Texas–Pan American improved to 16–12 for Guy's senior season, and although he led the team in scoring, he did not repeat as the country's leading scorer.
After college, Guy played professional basketball abroad, including a stint on Lobos UAG in Mexico.