Olympics Rio 2016: GB's James Guy finishes fourth as Sun Yang takes 200m freestyle gold
Sun Yang became the first Chinese swimmer to win the Olympic men's 200 metres freestyle gold medal while Britain's James Guy had to settle for fourth.
Sun, silver medallist in the event in London four years ago, touched the wall in one minute, 44.65 seconds to beat South Africa's Chad Le Clos by 0.55 seconds.
It was Sun's second medal of the Games after silver in the 400 free on Saturday.
Conor Dwyer of the United States won bronze.
France's Yannick Agnel, who won gold in London four years ago, was absent after being eliminated in the heats.
Guy, the world champion, looked dejected as he had to settle for fourth place and out of the medals.
Monday's victory was the third gold of Sun's Olympic career, and sixth medal, adding to the 400 and 1,500 metres titles he won in London.
Guy, whose room mate Adam Peaty stormed to breaststroke gold on Sunday and ended his country's 28 year wait for a male Olympic swimming champion, finished fourth.
In his delight at winning, Sun took off his swimming cap and attempted to throw it to Chinese supporters in the crowd above him, but it landed in the pool and he had to retrieve it.
The 20-year-old Brit finished just 16/100ths of a second off bronze.
Great Britain's James Guy looks dejected at Rio 2016Reuters