Hebert Sousa, a Brazilian boxer, won the Olympic gold by shockingly knocking out Oleksandr Khyzhniak of Ukraine in the final minutes.
As he entered the final three minutes, Sousa was already two rounds down and headed for silver at middleweight.
Hebert Sousa took out Oleksandr Khyzhniak from Ukraine to win Olympic gold
In a stunning twist of events, he changed the tide with an explosive and well-timed combination.
Khyzniaka shoved Sousa into a neutral corner, and then looked up to wave a right hand.
However, Sousa was not far behind and continued the idea with a lightening lefthook, which ended the show in an empathic manner.
Khyzhniak is the favourite, with European and World gold medals to him, but he bravely got back on his feet.
However, it wasn't enough to save his Olympic hopes. The referee canceled the contest.
Sousa was able to make a remarkable comeback in one of the most thrilling finals in Olympic boxing's history.
Galal Yafai, a British flyweight, won Team GB's first gold boxing title when he beat Filipino Carlo Paalam via points.
Yafai, 28 years old, said to the BBC that he has always longed to be an Olympic champion. Now, I am the Olympic champion and I'm thrilled.
"I worked hard and took up boxing, which has worked out well for me.
"I'm sure they're thrilled to hear from all my family and friends. It's been amazing to receive the support from my family back home.
"It's overwhelming, I'm so thankful for the support I have received.
"I am so determined to win, it's all in my heart and desire and it's working out for me today."
