Reade and Phillips miss out
A second straight BMX Olympic final left Shanaze Reade in despair as the three-time world champion finished a lowly sixth at the London 2012 Velopark.
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And there was further disappointment for Great Britain in the men's event as Liam Phillips trailed in eighth after unclipping from his pedal in mid-air before crashing on the penultimate corner.
Colombia's Mariana Pajon won the women's race with Sarah Walker of New Zealand second and Laura Smulders of Holland third. World champion Magalie Pottier of France was seventh.
Maris Strombergs of Latvia successfully defended his Olympic title ahead of world champion Sam Willoughby of Australia and Colombia's Carlos Oquendo.
Prime Minister David Cameron, his wife Samantha, Chancellor George Osborne and David Beckham were among the 6,000 crowd willing the British riders to victory, but Reade, who crashed out of the 2008 Olympic final attempting a gold-medal-or-bust manoeuvre, started poorly and could not recover.
The 23-year-old Crewe rider told BBC Sport: "I'm pretty emotionless. I'm sure it will sink in, but the Olympic Games is the biggest platform you can race at and you've just got to give it your best.
"I just tried to stay focused and do my absolute best and today it just wasn't good enough."
Reade's form appeared promising in the three-run semi-finals, but the one-run final, in less than 40 seconds, left no room for error and she was never in contention for the top place on the podium after a hesitant start.
Reade added: "I've worked for four years for this and it's over. I've just got to pick myself up and come back.
"I did everything I could. It's fantastic everyone's come out and supported me. I'm just gutted I didn't get a medal.
"I didn't want to go too early on the start and mess up my chances.
"I backed back a little bit and by the time I did that, I was on the inside, so everybody was closing in and I couldn't come back from that."
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Phillips, who suffered a broken collarbone at the BMX World Championships in Birmingham at the end of May, was more philosophical about his display.
The 23-year-old from Burnham-on-Sea said: "I had the start of my life.
"I overshot the second jump, which kind of killed me a little bit. I don't really know what happened from then on.
"He (Willoughby) jumped further to the inside and hit my front wheel. It was either I took my foot out and kept upright or risk it and I would probably have ended up on the deck a bit sooner.
"I put my foot back on the pedal, but couldn't get clipped in and through that technical section I went down.
"I'm not too disappointed. I came into competition after shoulder surgery 10 weeks ago.
"I went out there, did my best and I won't lose any sleep tonight. I know if you ran that race 10 times there would be 10 different outcomes. That's BMX."
Despite his eighth-placed finish in the final, Phillips was content with his overall performance.
"It's unfortunate I crashed, because I was in a medal spot, but I take a lot of confidence from this," he added.
"I'd like to think everyone here will be proud of the way I rode, I'm certainly proud and we'll go again in four years' time.
"I thoroughly enjoyed the competition. It was everything I thought it would be.
"I'm just extremely grateful I managed to come here and perform how I'd have liked to perform. Unfortunately I didn't get the result, but there's nothing I can do about it."