China's Sun Yang defends 800m freestyle title at worlds (1/8)

China's Sun Yang reacts after receiving his gold medal at the men's 800m freestyle victory ceremony during the World Swimming Championships at the Sant Jordi arena in Barcelona on July 31, 2013. Sun finished with 7:41.36. He has now won two gold medals in this World Championship meet in Barcelona as he won gold in the 400 meter freestyle on Sunday. [Photo/Osports]