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Russian Valieva, who recorded a positive doping test in December, finishes fourth after falling on ice
15-year-old led by almost two points after free programme event on Tuesday
She had already won gold in team event before positive doping result became public
Britain's Natasha McKay failed to qualify for free skate
Men's semi-final: USA 2-3 Great Britain (fourth end)
Thomas Duncan
BBC Scotland in Beijing
The women's team start a chant of 'U-S-A. U-S-A...' but they're the only ones and it quickly dies out.
A warm round of applause and some British cheers greet Bobby Lammie's latest shot.
At least they're all trying to generate an atmosphere!
Semi-final: USA 2-3 Great Britain (after three ends
And if Mr T says curling is cool, curling really must be cool!
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Men's curling - USA 2-3 Great Britain
Steve Cram
Curling commentator on BBC TV
The US do this all the time. They talk up their shots and then look ahead to GB's shots.
The final shot could not be any easier for Bruce Mouat - he just needs to get this anywhere near the house for a three.
Relax, everybody - take a deep breath! We're on the board!
Semi-final: USA 2-3 Great Britain
Thomas Duncan
BBC Scotland in Beijing
Boom, how's that for a response?
Rocking the Americans' confidence will be key, and that was a great way to do it.
We've seen in this tournament that they'll make some key shots, but they'll miss plenty too.
Semi-final: USA 2-3 Great Britain (after three ends)
Oh John Shuster.
The American skip gives it a lot of talk about where he is going to put his first stone.
The reality doesn't match theory. That leaves the door open for Great Britain and Bruce Mouat punishes his counterpart's mistakes.
THREE for Great Britain.
Big.
#bbcolympics
Image source, Getty ImagesThere is something a little Corey Pavin circa 1991 about Matt Hamilton and John Shuster's look I think.
Pavin was playing in a Ryder Cup clash that became known as "War on the Shore" for some of the bad blood between the two sides.
Any advances on the "Dingdong in Beijing" as a nickname if this match gets feisty?
Hit us up on the hashtag above...
Image source, Getty ImagesFigure skating - women's free skate
Sonia Oxley
BBC Sport in Beijing
The Russian Olympic Committee (ROC) says it will "categorically disagree" with any asterisk placed next to the results if Kamila Valieva finishes in the top three today.
The IOC has said there will be an asterisk until her anti-doping case is resolved and there will be no medal ceremony.
The ROC has sent a letter to the International Skating Union asking that the team results, where the Russians won gold, should stand regardless of the outcome of Valieva's case.
Figure skating - women's free skate programme
Image source, Getty ImagesWe're into the final 10 in the women's singles free skate programme. These skaters have the best scores from the short programme so, unless something remarkable happens, will be where the medals* come from.
Kamila Valieva, allowed to compete despite her positive drugs test, will be last to go (13:49 GMT) as the leader from the first stage.
Mariah Bell of the USA leads on 202.30 as it stands.
*No medals will be awarded if Valieva ends in the top three.
Newsround
If you're just getting into curling now... and have the odd question, Newsround have produced this rather helpful guide to the scoring and common terms. Check it out here.
Men's curling - USA 2-0 Great Britain
Jackie Lockhart
Four-time Olympic curler on BBC TV
I think it is just small errors. I guess the guys just have to remain focused and keep doing what they are doing.
They were unlucky to lose two there.
Men's curling - USA 2-0 Great Britain
Steve Cram
Curling commentator on BBC TV
That is going to be a steal of two - Bruce looks a little concerned. It wasn't the start they wanted.
It is a start that John Shuster could only have dreamed of. Great Britain cannot be unsettled by that.
Semi-final: USA 2-0 Great Britain (after two ends)
Thomas Duncan
BBC Scotland in Beijing
In their recent run of six straight wins, GB have mainly hit the front and held off their opposition superbly.
They'll need to keep calm and not let that steal of two affect them.
The support for all four teams in the stands is making it a tad louder than it has been. It's all relative, though, in a pretty empty arena!
Semi-final: USA 2-0 Great Britain (after two ends)
It is a two-stone steal against the head for the United States. That is a perfect start for them and a gut-punch for Bruce Mouat's men.
Time to get back in the saddle.
Semi-final: USA 0-0 Great Britain (after one end)
Argh!
Bruce Mouat's final stone is a touch overcooked.
The United States sweep furiously as it passes the T line.
The Americans have certainly stolen two points here.
Could it actually be three? The judges tape measure is being unfurled to check.
Semi-final- USA 0-0 Great Britain (second end)
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Even The Rock has got curling fever...
Semi-final: USA 0-0 Great Britain (after one end)
Bruce Mouat has a long, lingering look at the situation as he prepares for his first stone of the second end.
The Great Britain skip is struggling to hold back the tide of quality red play though.
The United States are lying two with a final stone each to go.
Semi-final: USA 0-0 Great Britain (after one end)
Image source, Getty ImagesThree stones left for each team in the second end.
Great Britain lying two.
Chris Plys changes that round to the United States advantage with a hairline rock, guided through a minefield at the front of the circle.
Semi-final: USA 0-0 Great Britain (after one end)
Image source, Getty ImagesThe shoulder-length hair. The moustache. The multi-coloured shoes. The lucky green hat which hangs from his back pocket.
American curler Matt Hamilton is one of those not-so-shy-and-retiring types in the US team.
Read more about his efforts to beat the world and help beat cancer simulataneously this week in Harry Poole's feature.
Men's curling - USA 0-0 Great Britain
Jackie Lockhart
Four-time Olympic curler on BBC TV
They have to focus on why they're here and what this could do for them and the sport they love.
Don't be distracted by your opponents, they are the defending champions, they've got a lot of big talkers.
Semi-final: USA 0-0 Great Britain (after one end)
Image source, GettyCagey stuff. Card close to the chest as Bruce Mouat and John Shuster pick off each others stones to play out an opening end stalemate.
This is going to get tense. Buckle in.