Chinese world number one Dong Dong broke down in tears as he snatched the Olympic men's trampoline title.
Dong's massive score of 62.990 handed him an emphatic victory over Russia's Dmitry Ushakov (61.769) with the final routine of the day.
Lu Chunlong secured a second medal for China, scoring 61.319 for third.
Dong, twice the individual world champion, won a bronze medal at Beijing 2008 but wept into his coach's arms as gold was confirmed at London 2012.
The 23-year-old was one of three competitors who spent more than 18 seconds in the air in the final, which marked the Olympic debut of a new scoring system using lasers to measure "time of flight", or time spent airborne.
But Dong's routine was set apart by its immense difficulty, scoring a start value of 17.800, well ahead of that registered by his nearest rivals.
Jason Burnett fell as the third competitor to go, wiping out any chance of a medal for Canada.
is Britain's only trampoline entrant at London 2012, in
Saturday's women's event.