Kōhei Uchimura
Five of the top 10 gymnasts from the 2012 Games returned: gold medalist Kōhei Uchimura of Japan, silver medalist Marcel Nguyen of Germany, fourth-place finisher Nikolai Kuksenkov of Ukraine (now competing for Russia), fifth-place finisher David Belyavskiy of Russia, and tenth-place finisher Sergio Sasaki of Brazil. Uchimura was favored and had been dominant for the last two Olympic cycles: he had followed a silver all-around medal in 2008 with three World Championships from 2009 to 2011, the Olympic gold in 2012, and then three more World Championships from 2013 to 2015.