Chinese diver Ren Qian won Olympic gold at the age of 15 as Britain's Tonia Couch finished out of the medals in the 10m platform competition.

Ren took the lead after the third of five dives and a superb inward three-and-a-half somersault with her fourth virtually clinched the title.

China's Si Yajie took the silver, while Canada's Meaghan Benfeito won bronze.

Couch, competing in her third Olympics, ended with a fine reverse two-and-a-half somersault but finished in 12th.

"The last few days I haven't dived my best, I've been a bit flat," the 27-year-old from Plymouth told the BBC.

"But I have made the final here, and that was goal."