Phillips Idowu's Olympics lasted for just three efforts as he missed out on a place in the Triple Jump final.
Idowu landed a best jump of 16.53m which was 4cm short of the qualifying standard and outside the top 12 places.
It ends a disappointing period for the athlete who was one of Britain's leading medal hopes coming into the season.
Injury meant this was only his fourth competition of the year and Idowu has been having intensive treatment on a knee problem in a bid to be fit for London 2012.
Idowu said: "That wasn't me out there today. I've competed for 12 years and I can't remember a time when I've performed
"The goal was always to come here and battle for the Olympic gold medal. Now it's not to be I just need to go home and reassess, spend time with family and kids today and try not to be so down about my performance.
"It's over now, there's nothing I can do. I'm not going to be competing in the final, it's a shame.
"The crowd have been great, I've seen them give the British athletes so much support in this week and I'm upset that I let them down.
"All year I've been tagged as a medal favourite and now I don't even get the chance to go out and get the chance to do what I've done year on year."