Yang Hak-seon became the first South Korean gymnast to strike gold at the Olympics when he won the men's vault title.
The world champion lived up to his billing as favourite after he earned an average score of 16.533 from his two vaults, edging out Russia's Denis Ablyazin on 16.399.
Yang powered down the 20-metres runway and launched into a spectacular triple-twisting front somersault, which he invented and is now named after him. He almost staggered off the mat on landing but so high was the difficulty he still drew 16.466.
He then trumped that effort with a triple twisting Tsukahara and went off on a victory lap long before his second score of 16.600 flashed up.
Ukraine's Igor Radivilov picked up bronze.