4.) Kohei Uchimura – Gymnastics- Japan

He is called the greatest gymnast of the planet and also the greatest gymnast of all time. His fans call him the superman and this all-round champion will try and emulate his performance of London 2012. He is 5 time Olympic medalist winning one gold and four silvers till now and is a 19 time world championship medalist.
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He will be competing in 8 gymnastics competitions & is touted to win gold in majority of them if not all.He was recently in news, as Pokemon Go fever caught up to him and his phone bill reached $5000. He will be 31, when the Olympics is hosted by Japan but there is hardly any doubt that he won’t be reigning champion in Tokyo.