Artem Dolgopyat secured Israel's first-ever Olympic gymnastics gold by the thinnest of margins on Sunday.
Ukraine-born Dolgopyat finished level on points with Spain's Rayderley Zapata in the floor but won the tiebreak with a higher difficulty score.
China's Xiao Ruoteng took the bronze.
It is only the second Olympic gold medal Israel have won at a Games after Gal Friedman's 2004 windsurfing win in Athens.
Dolgopyat, 24, came into the final as favourite by topping the qualifying standings.
After Russian team gold winner Nikita Nagornyy was marked down for over-rotating and stumbling on his trademark triple pike tumble, Zapata looked destined for the title.
But Dolgopyat turned the Spaniard's gold into silver when his routine matched Zapata's score of 14.933, and with their execution mark also the same, it went down to the difficulty level, with Dolgopyat taking the title by just 0.100.