Competing in the men’s judo -66kg division, Bouchard, who is ranked 16th in the world, was declared the winner by Ippon with Uchi-mata.
Ippon is the highest score a fighter can achieve while Uchi-mata in judo is an inner thigh throw.
Ovinou was apologetic in defeat, feeling he had let the nation down.
The Canadian Bouchard went on to fight for the bronze medal in the -66kg division.
Ovinou is PNG’s first judo athlete to compete at an Olympics.