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Broben an Olympic dark horse

16-year-old diving sensation Brittany Broben says she has "already exceeded" her expectations for the Olympic Games but is on a high after winning a Grand Prix event in the US.

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AUSTRALIA'S Melissa Wu and Brittany Broben will be diving for Olympic medals on Thursday night in the women's 10-metre platform final - and Wu denies the gold is already sewn up by China's Chen Ruolin.

Broben and Wu placed third and fourth respectively in the semi-finals and are confident they can improve in the 12-woman decider.

But they face a huge task to outpoint China's Chen, the 19-year-old defending champion from Beijing.

Australia's Melissa Wu competes in the women's 10m platform semi-finals.

Australia's Melissa Wu competes in the women's 10m platform semi-finals. Photo: AFP

Chen's score of 407.25 was nearly 48 points clear of her nearest rival, Canada's Meaghan Benfeito (359.90), followed by Broben (359.55) and Wu (355.60).

Wu, who collected a 10m synchronised silver medal in Beijing, said her only aim in the final was to produce five good dives.

But asked if everyone was diving for minor placings, Wu replied: "It [gold] is never sewn up, I don't think.

"But, yeah, I'm not focusing too much on medals.

"I just want to got out and dive well and be happy with that."

Broben is the youngest member of the Australian Olympic team and will not turn 17 until November.

She has the perfect role model in Wu, who was the 'baby' of the Aussie team four years ago.

The pair dived one after the other in the semi-final, and while they are close friends, it is strictly business on the pool deck.

"I think it's amazing for her," Wu said.

"She's diving really well and she seems really confident and really enjoying the experience. I'm so happy for her . . . we say 'good luck' before, and we want the other person to do well, but we don't tend to speak too much [during competition].

"There's too much happening."

Broben said she had 'a lot of nerves' heading into her first Olympics but would try to relax in the final.

"I've been controlling them pretty good, so hopefully I can do that tonight," he said.

Broben said reaching the final was "definitely" a goal but was unsure if anyone could beat Chen.

"I have no idea," she said. "I'm just going to go out there and give it my best."

China have already won four of the five diving gold medals in London.