Ciara Mageean's opening track race of the season in Cork didn't go to plan as she was surprisingly beaten by Limerick athlete Orla Drumm.
Running at the Leevale meeting, Mageean clocked a comparatively pedestrian 4:21.61 in the 1500m as she finished over three seconds behind Drumm.
Speaking after the race, the Portaferry athlete said that she had felt "flat".
Mageean set her personal best of 4:07.45 last year and is hoping to achieve the Olympic standard of 4:06.
The 20-year-old has already begun to map out her racing schedule for the season.
Mageean will run over 1,000m in Norway on 22 May before taking part in a 1500m in Morocco four days later which is already being earmarked as an opportunity for her to achieve the London A standard.
Top athletics agent Nic Bideau, the husband of Irish athletics legend Sonia O'Sullivan, has helped secure 2010 world junior silver medallist Mageean a place in the field in Rabat.
The Morocco race is being specifically organised for athletes chasing the Olympic mark and a fast pace should be guaranteed.