In the women -49kg category, Sohui Kim of South Korea won gold and Tijana Bogdanovic of Serbia won silver, while Patimat Abakarova of Azerbaijan and Thailand's Panipak Wongpattanakit took home bronzes.
In the men -58kg category, Shuai Zhang of China won gold and Tawin Hanbat of Thailand won silver, while Luisito Pie of Dominican Republic and South Korea's Taehun Kim won bronzes.
With taekwondo's two lightest weight categories being contested, top stars fell one by one. Pundits around the arena were left stunned as some of the sport's most famed athletes lost in the first and second rounds.
The crowd in the Carioca Arena 3 in Rio's Barra Olympic Park generated an electric atmosphere throughout the day. The most prominent guest was IOC President Thomas Bach, who visited for the finals and was introduced to star Chinese athlete Jingyu Wu.