Gentry, who has an NCAA title to his name and has coached at Stanford, settled for a fifth-place tie in his division as a competitor for Canada.
He was knocked out of gold medal contention by the eventual gold medalist, American Jordan Burroughs, in the quarterfinal.
Gentry eventually met Russia's Denis Tsargush for a bout to determine the bronze medal. Tsargush won the match, 1-0, 2-0.
Gentry, who lost his only Olympic match four years ago in Beijing, recorded his first Olympic win early Friday morning with a 3-0, 1-1 victory over India's Narsingh Yadav.
After losing to Burroughs, Gentry and Puerto Rico's Francisco Tanco Soler, advanced into the bronze medal repechage when Burroughs defeated Tsargush.