Ireland's David O'Loughlin finished 12th in today's qualification round of the individual pursuit at the world track championships in Ballerup, Copenhagen.
The Mayo rider posted a time of four minutes 25.203 seconds in the 4000m test, fading slightly towards the end.
He briefly stood as high as fourth in the standings, but dropped back as other riders completed their qualification run.
His final time was over four seconds outside the personal best that he set en route to sixth place in the 2007 world championships in Manchester.
Jesse Sergent (New Zealand) was quickest this afternoon, his time of four minutes 15.988 edging out last year's champion Taylor Phinney (USA).
The two will ride it out for the gold medal this evening, while Jack Bobridge (Australia) and Alexander Serov (Russia) will compete for bronze.
All other finishing positions from fourth place back are determined by their performance in the qualifiers.
Ireland's Matt Brammeier will be in action later today in the scratch race.
He was fourth in the world cup in Manchester last November and is hoping to make a strong impression in his first worlds outing.