 At the 2012 Summer Olympics in London, Zou led the team to win gold and later successfully defended his Olympic title at the floor exercise, winning gold again, only the second to do so in the men's floor exercise following Soviet Gymnast Nikolai Andrianov who won the event in 1972 and 1976.He was unable to defend his title in the horizontal bar however, finishing less than two tenths of a point behind the lead, eventually winning a bronze medal in the event.The last gymnast to successfully defend his Olympic title on the high bar was Mitsuo Tsukahara, who won the event in 1972 and 1976, at the same Olympics as Andrianov.