Ukraine's Oleksandr Khyzhniak wins the first two rounds comfortably, before being stunned by Sousa, who lands a heavy shot to take the Olympic gold medal.
Brazil's Hebert Sousa has won a spectacular men's middleweight gold, after landing a crushing left hook to leave Ukraine's Oleksandr Khyzhniak down and beaten.
The referee called the bout off after 1 minute and 29 seconds of round three in one of the most memorable bouts of the entire boxing competition. With the Ukrainian leading 20-18 on the scorecards heading into the final round, Sousa caught Khyzhniak flush on the chin with a sharp left hook to end the contest.
Khyzhniak goes home with the silver medal, however there will be celebrations all across Brazil after a resounding Sousa win makes him Olympic champion.
In a post-fight interview, Sousa pointed to the comprehensive preparations that left him holding the Olympic gold medal.
“It was very difficult and I have to confront my opponent. Very, very powerful. I believed in our possibility and I trained to get the medal. I trained and trained,” he said.
And when asked how he felt about winning the gold medal, the Brazilian champion said: “It is fantastic and I am very emotional. I want to jump. I’m very happy.”
Khyzhniak was not overly downbeat about the defeat, keeping one eye on a return match against the Brazilian.
“I will try to remain in amateur boxing," he said. "I want to turn this silver into gold. I’ve played him before and I want to face him again.”